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Disclaimer

Although the information contained in this Code has been obtained from sources believed to be reliable, New Zealand Metal Roofing Manufacturers Inc. makes no warranties or representations of any kind (express or implied) regarding the accuracy, adequacy, currency or completeness of the information, or that it is suitable for the intended use.

Compliance with this Code does not guarantee immunity from breach of any statutory requirements, the New Zealand Building Code or relevant Standards. The final responsibility for the correct design and specification rests with the designer and for its satisfactory execution with the contractor.

While most data have been compiled from case histories, trade experience and testing, small changes in the environment can produce marked differences in performance. The decision to use a particular material, and in what manner, is made at your own risk. The use of a particular material and method may, therefore, need to be modified to its intended end use and environment.

New Zealand Metal Roofing Manufacturers Inc., its directors, officers or employees shall not be responsible for any direct, indirect or special loss or damage arising from, as a consequence of, use of or reliance upon any information contained in this Code.

New Zealand Metal Roofing Manufacturers Inc. expressly disclaims any liability which is based on or arises out of the information or any errors, omissions or misstatements.

If reprinted, reproduced or used in any form, the New Zealand Metal Roofing Manufacturers Inc. (NZMRM) should be acknowledged as the source of information.

You should always refer to the current online Code of Practicefor the most recent updates on information contained in this Code.

Scope

This Code of Practice provides requirements, information and guidelines, to the Building Consent Authorities, the Building Certifier, Specifier, Designer, Licensed Building Practitioner, Trade Trainee, Installer and the end user on the design, installation, performance, and transportation of all metal roof and wall cladding used in New Zealand.

The calculations and the details contained in this Code of Practice provide a means of complying with the performance provisions of the NZBC and the requirements of the Health and Safety at Work Act 2015.

The scope of this document includes all buildings covered by NZS 3604, AS/NZS 1170 and those designed and built under specific engineering design.

It has been written and compiled from proven performance and cites a standard of acceptable practice agreed between manufacturers and roofing contractors.

The drawings and requirements contained in this Code illustrate acceptable trade practice, but recommended or better trade practice is also quoted as being a preferred alternative.

Because the environment and wind categories vary throughout New Zealand, acceptable trade practice must be altered accordingly; in severe environments and high wind design load categories, the requirements of the NZBC will only be met by using specific detailing as described in this Code.

The purpose of this Code of Practice is to present both Acceptable Trade Practice and Recommended Trade Practice, in a user-friendly format to ensure that the roof and wall cladding, flashings, drainage accessories, and fastenings will:

comply with the requirements of B1, B2, E1 E2 and E3 of the NZBC;
comply with the design loading requirements of AS/NZS 1170 and NZS 3604 and with AS/NZS 1562;
have and optimised lifespan; and
be weathertight.

COP v24.12:Revision-History;

Revision History

19 Revision History

Policy for Updates to NZ Metal Roof and Wall Cladding Code Practice.

All revisions to clauses of the COP after June 2018 are recorded at 19 Revision History, including a brief explanation of the change.

See sub-clauses for detail of revisions at particular dates.

Revisions are split into 3 categories for simple assessment by users:

19A Revision Categories

Category	Description	Notification
Category 1 - Minor Errata	Correction to spelling, grammar or formatting that have no bearing on on the substance of the clause.	Recorded on website only - not individually included in emailed update
Category 2 - Editing and rearrangement	A clause or section of clauses has been rewritten to some extent for better articulation of the existing recommendation. Existing citations of the COP in project documentation may be less clear as a result, but recommendations are not altered.	Recorded on website, and will be cited in emailed update as either specific or summary information as appropriate.
Category 3 - Substantial change to recommendation	A substantial change in a specific recommendation of the COP has taken place. A review of existing project documentation against the new clause is considered essential.	Recorded on website, and explained with detail in emailed update

v24.12 December 2024

19.1 v24.12 December 2024

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 December 2024.

Substantial change to recommendations:

3.11.2 Aluminium Cladding Wind Load Span Graphs
Only 0.90 mm Aluminium is now offered as a standard thickness.
3.7.2 Deflection
Added the statement: "Temporary deflection under load is not considered for roof load tables as it has not been found to affect weathertightness. Temporary deflection under load of wall cladding is a recommended limitation for aesthetic reasons, but it is not mandatory."
3.10.2 Maximum Spans and Fastening Pattern for Corrugate Wall Cladding
Changed "span/120 + P/20" to "span/120 + P/30"
5.6.3 Overflows
Changed the recommended cross-sectional area of a scupper to align with the BRANZ recommendation.
5.4.5.1 Internal Gutter Design Features
Added a recommendation to align with 5.6.3 Overflows, for the cross-sectional area of a scupper to be 1½ times that of the downpipe.
5.5.6 Asymmetrical Valleys
Changed recommendation to: "A valley baffle is required in all cases where the valley has a change of angle or difference in roof pitch exceeds 10°."

Notable Editing and rearrangement:

5.5.1 Valley Fixing
- Rearranged layout.
- Clarified statement about positive (through) fixing.
- Replaced the old illustration for Clip System with Correct Valley Fixing, Allowing for Thermal Movement
- Added illustrations for Valley Junction at the Apex.
10.11.1 Underlay Standards
Moved this clause to 10.11 Underlay for continuity and relevance.
9.4.2.6 Penetration Flashings on Trapezoidal Profiles
Updated 9.4.2.6F Cricket Under-Soaker: Trapezoidal the cricket covering the penetration apron.

The rest of the updates consisted of minor corrections and edits.

19.1A

Category	Clause Number (prior to update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	New revision message for V24.12, published on 1 December.
3 - Substantial change to recommendation	3.7.2	3.7.2 Deflection	Added a statement: Temporary deflection under load is not considered for roof load tables as it has not been found to affect weathertightness. Temporary deflection under load of wall cladding is a recommended limitation for aesthetic reasons, but it is not mandatory.
3 - Substantial change to recommendation	3.10.2	3.10.2 Maximum Spans and Fastening Pattern for Corrugate Wall Cladding	Changed "span/120 + P/20" to "span/120 + P/30".
3 - Substantial change to recommendation	5.4.5.1	5.4.5.1 Internal Gutter Design Features	Added a recommendation to align with 5.6.3 Overflows, for the cross-sectional area of a scupper to be 1½ times that of the downpipe.
2 - Editing and rearrangement	5.5.1	5.5.1 Valley Fixing	Rearranged layout. Clarified statement about positive (through) fixing. Replaced the old illustration for Clip System with 5.5.1A Correct Valley Fixing, Allowing for Thermal Movement. Added illustrations for Valley Junction at the Apex.
3 - Substantial change to recommendation	5.5.6	5.5.6 Asymmetrical Valleys	Changed recommendation: A valley baﬄe is required in all cases where a valley has a change of angle or diﬀerence in roof pitch exceeds 10 .
3 - Substantial change to recommendation	5.6.3	5.6.3 Overflows	Changed the recommended cross-sectional area of a scupper to align with BRANZ recommendation.
2 - Editing and rearrangement	9.4.2.6	9.4.2.6 Penetration Flashings on Trapezoidal Profiles	Updated the illustration to show the apron of the cricket covering the penetration apron.
1 - Minor Errata	10.1	10.10 Ventilation Pathways	Typo fix: changed through to trough. No changes to recommendations.
2 - Editing and rearrangement	10.12.5	10.11.1 Underlay Standards	Moved clause to 10.11 Underlay for relevance. Fixed table formatting. No changes to recommendations.
4 - Clause Inserted		19.1 v24.12 December 2024	Revision details for v24.12; published on 1 December 2024.

v24.09 September 2024

19.2 v24.09 September 2024

The latest changes to the NZMRM Metal Roof and Wall Cladding Code of Practice; published on 1 September 2024.

Category 3: Substantial Changes to Recommendations.

8.5.1 Ridge and Hip Intersections
Changed the requirement for butyl membranes, underlay, or soft flashing for weathertightness to a recommendation as a secondary method in addition to good design and installation.
5.4.2.3 Spouting Support Systems
Clarifying recommendation: brackets for pre-painted spouting in marine conditions must be appropriately painted or powder-coated before installation, or non-ferrous metals should be used.

Category 2: Editing and Rearrangement

8.4.4 Flashing Laps
Clarified the recommendation for unsealed laps to have a minimum of 150 mm cover and sealed laps a minimum of 100 mm.
18.2A Rafter, Hip and Rise Chart
Added options for pitches steeper than 60°.

19.2A Revision Detail v24.09 - 2024 -September

Category	Clause Number (prior to update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Updated Revisions Message
1 - Minor Errata	4.3	4.3 Metal Performance	Minor revision to improve clarity, conciseness, style, or layout. No changes to recommendations.
1 - Minor Errata	4.6	4.6 Environmental Categories	Minor revision for style, grammar, and clarity. No changes to recommendations.
1 - Minor Errata	4.10.3	4.10.3 Solar Collectors and Other Roof Mounted Structures	Resizing of photos for consistency. No changes to recommendations.
1 - Minor Errata	4.10.6	4.10.6 Capillary Action	Minor edit for style, grammar, clarity, or consistency. No changes to recommendations.
1 - Minor Errata	4.14	4.14 Swarf Staining and Cut Edge Corrosion	Resized photos for consistency and layout. No changes to recommendations.
1 - Minor Errata	4.15	4.15 Clearances	Illustration reformatting. No changes to recommendations.
1 - Minor Errata	4.15.1	4.15.1 Ground Clearance	Illustration reformatting. No changes to recommendations.
1 - Minor Errata	4.18.2	4.18.2 Post-Painted Factory Applied finish	Minor edit to improve clarity, conciseness, style, or layout. No changes to recommendations.
2 - Editing and rearrangement	5.4.2.3	5.4.2.3 Spouting Support Systems	Editing to clarify the requirement for pre-painting spouting brackets.
1 - Minor Errata	8.4	8.4 Flashing Cover	Fixed typo. changed "m" to "mm".
2 - Editing and rearrangement	8.4.4	8.4.4 Flashing Laps	Clarified the recommendation for unsealed laps to have a minimum of 150 mm cover and sealed laps a minimum of 100 mm.
3 - Substantial change to recommendation	8.5.1	8.5.1 Ridge and Hip Intersections	Renamed clause to Ridge and Hip Intersections. Changed the requirement for butyl membranes, underlay, or soft flashing for weathertightness to a recommendation as a secondary method in addition to good design and installation.
1 - Minor Errata	15.1.6	15.1.6 Durability	Fixed the spelling of soffit. No changes to recommendations.
2 - Editing and rearrangement	18.2	18.2 Pitch & Rise Calculator	Added pitches to the table above 60°
4 - Clause Inserted		19.2 v24.09 September 2024	A new clause providing details of the updates published on 1 September 2024.

v24.06 June 2024

19.3 v24.06 June 2024

The updates published on 1 June 2024 include improvements to 5.4.2.3 Spouting Support Systems and clarifying recommendations to prevent negative pressure with 10.10.1.3 Ridge Vents. Substantial changes include removing wind load/span graphs for 0.70 mm aluminium.

Editing and rearrangement updates involve updating and editing images for consistency, clarifying 7.3.2 Roof Cladding Expansion Provisions, material thickness, and amending references to the availability of 4.16.1.6 AM Coatings in New Zealand. Minor edits were made for grammar, style, clarity, and consistency.

Notable revisions:

We removed the option of 0.70 mm Aluminium cladding from 3.11.2 Aluminium Cladding Wind Load Span Graphs because 0.90 mm Aluminium is offered as a standard thickness.
Experience showed that hot-dipped galvanised gutter support brackets are not as durable as pre-painted steel products. Therefore, we added some recommendations to improve the durability of 5.4.2.3 Spouting Support Systems.
Although not a change in recommendation, we added a statement to 10.10.1.3 Ridge Vents to help prevent negative pressure in roof cavities.
We clarified the positioning of oversized holes and washers to aid in making 7.3.2 Roof Cladding Expansion Provisions.

In addition to these and some minor edits and rearrangements, several images have been revised for consistency. For a detailed list of revisions, please visit 19.3 v24.06 June 2024.

19.3A Revision Detail v24.06 - 2024 - June

Category	Clause Number (prior to update)	Clause (As of current publication)	Details
3 - Substantial change to recommendation	5.4.2.3	5.4.2.3 Spouting Support Systems	Clause renamed. Expanded recommendation for compatibility of spouting support systems.
3 - Substantial change to recommendation	10.10.1.3	10.10.1.3 Ridge Vents	Added recommendation for ridge vents to be smaller than eaves vents.
0 - Clause Removed	3.11.2.3	Trapezoidal Five Rib Aluminium – 0.70	The clause has been removed because aluminium is now offered in 0.90mm as the standard thickness.
0 - Clause Removed	3.11.2.1	Corrugated Aluminium – 0.70	The clause has been removed because aluminium is now offered in 0.90mm as the standard thickness.
2 - Editing and rearrangement	1	1 Introduction	Updated Revisions Message and rewriting for clarity. No changes in recommendations.
1 - Minor Errata	1.4	1.4 Acknowledgements	Typo fix: tradespeople
1 - Minor Errata	1.5.1	1.5.1 Mediation	Minor revisions for grammar and clarity. No change to recommendations.
1 - Minor Errata	1.5.2	1.5.2 Adjudication	Minor revision for grammar, style, and clarity. No change to recommendations.
1 - Minor Errata	1.5.3	1.5.3 Arbitration and Litigation	Minor punctuation fix.
2 - Editing and rearrangement	2.1	2.1 Definitions	Added definition for Vented Ridging.
1 - Minor Errata	3	3 Structure	Minor revision for style, grammar, and clarity. No change to recommendations.
1 - Minor Errata	3.2	3.2 Standards	Minor review for style, grammar, and clarity. No change to recommendations.
1 - Minor Errata	3.2.1	3.2.1 AS/AZS 1170.2:2011	Minor revision for style, grammar and clarity. No changes to recommendations.
1 - Minor Errata	3.3	3.3 Performance	Minor revision for style, grammar, and clarity. No changes to recommendations.
2 - Editing and rearrangement	3.4.6	3.4.6 Material Thickness	Minor review for style, grammar, and clarity. Edit to clarify the use of 0.63 mm material.
1 - Minor Errata	4.2	4.2 Metal Corrosion	Minor edit for style, grammar, and clarity. No change to recommendations.
1 - Minor Errata	4.5.2	4.5.2 Sea Spray	Minor revision for style, grammar, and clarity. No changes to recommendations.
1 - Minor Errata	4.6.1	4.6.1 Assessment of Marine Environments	Minor revision for style, grammar, and clarity. No changes to recommendations.
1 - Minor Errata	4.6.2	4.6.2 Environmental Guides	Minor revision for style, grammar, and clarity. No changes to recommendations.
1 - Minor Errata	4.8.3	4.8.3 Graffiti Removal	Minor revision for style, grammar, and clarity. No changes to recommendations.
1 - Minor Errata	4.8.4	4.8.4 Lichen	Minor revison for style, layout, grammar, and clarity. No changes to recommendations.
1 - Minor Errata	4.9.1	4.9.1 Dissimilar Metals	Minor revision for style, layout, grammar, and clarity. No changes to recommendations.
1 - Minor Errata	4.9.4	4.9.4 Compatibility Table	Minor revision for layout, style, grammar, and clarity. No changes to recommendations.
1 - Minor Errata	4.10.1	4.10.1 Unwashed Areas	Edit for style, grammar, clarity, and consistency.
1 - Minor Errata	4.10.2	4.10.2 Poultice Corrosion	Minor edit for style, grammar, clarity, or consistency. No change to recommendations.
1 - Minor Errata	4.10.6	4.10.6 Capillary Action	Minor edit for style, grammar, clarity, or consistency. No changes to recommendations.
1 - Minor Errata	4.11	4.11 Inert Catchment	Minor edits for style, clarity, consistency, and grammar. No changes to recommendations.
1 - Minor Errata	4.12	4.12 Ponding	Minor edits for grammar, style, clarity, or consistency. No changes to recommendations.
1 - Minor Errata	4.13	4.13 Pitting Corrosion	Minor edit for grammar, clarity, consistency, and style. No changes to recommendations.
1 - Minor Errata	4.14	4.14 Swarf Staining and Cut Edge Corrosion	Minor edits for grammar, punctuation, clarity, and consistency. No changes to recommendations.
1 - Minor Errata	4.15	4.15 Clearances	Minor editing for style, grammar, clarity, and consistency. No changes to recommendations.
1 - Minor Errata	4.15.1	4.15.1 Ground Clearance	Minor edit for style, layout, grammar, clarity, and consistency. No changes to recommendations.
1 - Minor Errata	4.15.2	4.15.2 Site Management	Minor edit for style, grammar, layout, clarity, and conistency. No changes to recommendations.
1 - Minor Errata	4.16.1.1	4.16.1.1 Metallic Coatings	Minor edit for grammar and punctuation. No changes to recommendations.
2 - Editing and rearrangement	4.16.1.6	4.16.1.6 AM Coatings	Removed reference to coatings weights and availability in NZ.
1 - Minor Errata	4.16.3	4.16.3 Aluminium	Minor edits for grammar, style, punctuation, and consistency. No changes to recommendations.
1 - Minor Errata	4.16.4	4.16.4 Zinc	Minor edit for style, grammar, and punctuation. No changes to recommendations.
1 - Minor Errata	5.7	5.7 Outlets and Downpipes	Edits for clarity and corrected link to Inert Catchment
1 - Minor Errata	7.3.2	7.3.2 Roof Cladding Expansion Provisions	Minor edit for style, grammar, consistency, or clarity.
4 - Clause Inserted	19.1	19.3 v24.06 June 2024	New clause providing details of the updates published on 1 June 2024.

v24.03 March 2024

19.4 v24.03 March 2024

In the most recent update to the NZ Metal Roof and Wall Cladding Code of Practice , published on 1 March 2024, there were no substantial changes to recommendations.

New Clauses:

7.4.1 Wall Cladding End Laps: Giving guidance for flashing end laps on wall cladding. Including an illustration.

Editing and rearrangement:

8.5.4 Parapet Cappings: added a new illustration showing how to flash a parapet-roof intersection.
5.7 Outlets and Downpipes: Inserted an explanation for using stand-off clips.
2 Glossary: Added defintion of stand-off clips.
Renamed 12.1.3A Poor Purlin-to-Rafter Connection to 12.1A Poor Purlin to Rafter Connection.
4.17 Tray Roofing Clip Durability: made allowance for plastic clips.
5.4.7 Gutter Capacity Calculator: updated Manufacturer's Data illustration to ignore freeboard when there is Overflow along Gutter.

The rest of the updates consisted of some renamed clauses, and minor corrections and edits.

19.4A Revision Detail v24.03 - 2024 - March

Category	Clause Number (prior to update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Updated Revisions Message
2 - Editing and rearrangement	2.1	2.1 Definitions	Added definition for Stand-off clips.
1 - Minor Errata	3.4.5	3.4.5 Material Grade	Fixed typo in title for 3.4.5C Typical Result for G550 Steel.
2 - Editing and rearrangement	4.17	4.17 Tray Roofing Clip Durability	Made provision for plastic clips in table 4.17A Allowable Clip Material for Tray and Trough Cladding Over Dry Internal Environments.
2 - Editing and rearrangement	5.4.7	5.4.7 Gutter Capacity Calculator	Update Manufacturer's Data illustration to ignore freeboard when there is Overflow along Gutter
4 - Clause Inserted		7.4.1 Wall Cladding End Laps	New Clause giving guidance about wall cladding end laps.
1 - Minor Errata	8.4	8.4 Flashing Cover	Sized text for consistency throughout the illustrations. Added a hem to 8.4E Barge Flashing Cover — Trapezoidal and Secret Fixed and 8.4G Barge Flashing Cover — Corrugate. Adjusted the cover shown in 8.4O Parapet Cap Cover (no change to values)
2 - Editing and rearrangement	8.5.4	8.5.4 Parapet Cappings	New illustration showing a 8.5.4G Parapet-Roof Intersection.
2 - Editing and rearrangement	12.1.3	12.1.3 Thermal Noise	Renamed photograph to 12.1.3A Poor Purlin-to-Rafter Connection.
1 - Minor Errata	14.11	14.11 Overhang	Minor adjustments on illustration for improved accuracy, some minor content editing for clarity.
1 - Minor Errata	15.4.5	15.4.5 Tray Fixings	Typo fix.
1 - Minor Errata	15.4.8	15.4.8 Tray Ventilation	Typo Fix.
1 - Minor Errata	15.4.11	15.4.11 Tray Roof Flashing	Reformatted text in illustrations for consistency.
4 - Clause Inserted		19.4 v24.03 March 2024	New revison clause detailing changes following the update on 1 March 2024

v23.12 December 2023

19.5 v23.12 December 2023

NZ Metal Roof and Wall Cladding Code of Practice v23.12

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 December 2023.

Substantial change to recommendations:

15.1 Curved Roofs and all its sub-clauses have been substantially reviewed and revised.
8.4 Flashing Cover:
- Added clarification of rib cover to Apron Flashing Cover — Trapezoidal.
- Changed rib height for minimum flashing cover from 25 mm to 20 mm.
- Changed recommendation for longitudinal flashings to include both apron and barge flashings.
- Added Category D for SED in Wind Zones up to 68 m/s.

Notable Editing and rearrangement:

15.4.2 Tray Roofing Profiles: This clause has been renamed and editied to clarify the difference between tray roofing and standing seam roofing.
15.4.4 Tray Roofing Weathertightness: A clause has been added on weathertightness of standing seam roofs.
15.4.3 Tray Roofing Design: This clause has been renamed and some of the content revised.
15.4.5 Tray Fixings: Content editing for clarity.
14.3.2 Wet Storage Damage: Added content for dealing with Blooming.
8.5.3.1 Ridge – barge Intersections: New Illustration showing a 8.5.3.1D Head-Barge/Ridge/Barge Junction.
8.4.1 Apron Upstands: Inserted an illustration to show Undertray for additional upstand.

The rest of the updates consisted of some renamed clauses, and minor corrections and edits.

19.5A Revision Detail v23.12 - 2023 - December

Category	Clause Number (prior to update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	3.9.3	3.10.2 Maximum Spans and Fastening Pattern for Corrugate Wall Cladding	This clause has been renamed and moved to 3.10 Fastening Pattern Tables – Designs to NZS 3604.
1 - Minor Errata	3.10.1	3.10.1 G550 Steel Roof Fastening Pattern Tables	Clause has been renamed to clearly differentiate between roof and wall cladding fastening patterns.
3 - Substantial change to recommendation	15.1	15.1 Curved Roofs	The main clause 15.1 Curved roof has been comprehensively reviewed and revised.
3 - Substantial change to recommendation	15.1.1	15.1.7 Spring Curving	This clause has been substantially revised during the overall review of 15.1 Curved Roofs.
0 - Clause Removed	15.1.3	Transverse Laps	This clause has been removed during the revision of 15.1 Curved Roofs. Information previously contained in this clause is now available in other sub-clauses of the main clause (15.1 Curved Roofs).
4 - Clause Inserted		15.1.3 Penetrations: Curved Roofs	A newly created clause as part of the overall revision of 15.1 Curved Roofs
4 - Clause Inserted		15.1.4 Ventilation: Curved Roofs	A newly created clause as part of the overall revision of 15.1 Curved Roofs.
2 - Editing and rearrangement	9	9 External Moisture Penetrations	New referral to RANZ Roofing Guide for further information.
4 - Clause Inserted		15.1.5 Thermal Expansion: Curved Roofs	A newly created clause as part of the overall revision of 15.1 Curved Roofs.
4 - Clause Inserted		15.1.9 Installation: Curved Roofs	New clause, created from information previously contained in 15.1.11 Crimp Curving.
0 - Clause Removed	15.1.6	Concave Roofs	This clause has been removed during the revision of 15.1 Curved Roofs.
0 - Clause Removed	15.1.10	Timber Fixing	This clause has been removed during the revision of 15.1 Curved Roofs.
2 - Editing and rearrangement	15.1.4	15.1.6 Durability	This clause has been edited during the overall revision of 15.1 Curved Roofs.
0 - Clause Removed	15.1.5	Purlin Spacing	This clause has been removed during the overall revision of 15.1 Curved Roofs. The information can now be found in 15.1.7 Spring Curving.
2 - Editing and rearrangement	15.1.7	15.1.8 Pre-Curved Roofs	This clause has been revised as part of the overall revision of 15.1 Curved Roofs.
2 - Editing and rearrangement	15.1.9	15.1.11 Crimp Curving	This clause has been substantially edited during the revision of 15.1 Curved Roofs. Information about lapping can be found at 9.7.9 Laps and 15.1.2 End Laps: Curved Roofs respectively. The information about installing curved roofs and the correct fixing order can now be found at 15.1.9 Installation: Curved Roofs.
2 - Editing and rearrangement	15.1.8	15.1.10 Roll Curving	This clause has been revised during the overall revision of 15.1 Curved Roofs.
4 - Clause Inserted		15.1.2 End Laps: Curved Roofs	Newly created clause as part of the overall revision of 15.1 Curved Roofs.
2 - Editing and rearrangement	9.4	9.4 Penetration Design	New referral to RANZ Roofing Guide for further information.
2 - Editing and rearrangement	5.4.7	5.4.7 Gutter Capacity Calculator	Additional label to clarify that gutter dimensions at the outlet are to be used for the calculation.
2 - Editing and rearrangement	8	8 External Moisture Flashings	New referral to RANZ Roofing Guide for further information.
2 - Editing and rearrangement	8.2	8.2 Flashing Design	New referral to RANZ Roofing Guide for further information.
2 - Editing and rearrangement	1, 1	1 Introduction	Updated Revisions Message
3 - Substantial change to recommendation	15.1.2	15.1.1 Side Laps: Curved Roofs	This clause has been comprehensively revised during the overall review of 15.1 Curved Roofs
4 - Clause Inserted		19.5 v23.12 December 2023	Revision details for V23.12; published on 1 December 2023.
2 - Editing and rearrangement	8.5.2.1	8.5.3.1 Ridge – barge Intersections	New illustration showing a head barge/ridge/barge junction.
3 - Substantial change to recommendation	8.4	8.4 Flashing Cover	Added clarification of rib cover to 8.4K Apron Flashing Cover — Trapezoidal. Changed rib height for minimum flashing cover from 25 mm to 20 mm. Changed recommendation for longitudinal flashings to include both apron and barge flashings. Added Category "D" for SED up to 68 m/s, all pitches, and updated tables and the illustrations to match.
4 - Clause Inserted		8.5.2 Head Barge/Ridge/Barge Junction	New iIllustration of Head Barge/Ridge/Barge Junction.
2 - Editing and rearrangement	8.4.1	8.4.1 Apron Upstands	Inserted an illustration to show Undertray for additional upstand.
2 - Editing and rearrangement	14.3.2	14.3.2 Wet Storage Damage	Added description and recommendation for dealing with Blooming.
1 - Minor Errata	14.13.2	14.13.2 Screws	Fixed table: Screw Thread Types.
0 - Clause Removed	16.2.1	Installation	Clause removed because the subject is comprehensively covered in Installation.
2 - Editing and rearrangement	15.4.3	15.4.3 Tray Roofing Design	This clause has been renamed Tray Roofing Design. Some content editing for clarity.
2 - Editing and rearrangement	15.4.12.1	15.4.13.1 Tray Cladding Set Out	The clause has been renamed Tray Cladding Set Out and a grammar fix.
4 - Clause Inserted	10.1.4	10.1.4 Compliance	New Clause under 10.1 NZBC Clause E3: Internal Moisture (Extract).
2 - Editing and rearrangement	15.4.6	15.4.7 Sarking	Changed recommendation for overhang at the gutter line.
2 - Editing and rearrangement	15.4.4	15.4.5 Tray Fixings	Content editing for clarity.
2 - Editing and rearrangement	15.4.2	15.4.2 Tray Roofing Profiles	This clause has been renamed Tray Roofing Profiles. Some content editing.
2 - Editing and rearrangement	15.4.1	15.4.1 Tray Roofing Materials	Renamed the clause to Tray Roofing Materials. Some minor edits.
3 - Substantial change to recommendation	15.4	15.4 Tray Roofing	This clause has been revised to clarify the difference between Tray roofing and standing seam roofing, as terms are used in the Code of Practice.
2 - Editing and rearrangement	9.4.2.6	9.4.2.6 Penetration Flashings on Trapezoidal Profiles	Renamed clause to Penetration Flashings on Trapezoidal Profiles.
4 - Clause Inserted		15.4.4 Tray Roofing Weathertightness	A new clause dealing with Weathertightness and tray roofing.
4 - Clause Inserted		4.17 Tray Roofing Clip Durability	A new clause about the durability of roofing clips.
2 - Editing and rearrangement	9.4.1	9.4.1 Penetration Back Flashings	Clause renamed to Penetration Back Flashings.
2 - Editing and rearrangement	9.4.2.5	9.4.2.5 Penetration Flashings on Corrugated Profiles	Renamed the clause to Penetration Flashings on Corrugated Profiles.
1 - Minor Errata	4, 4	4 Durability	Inserted a link to the 4.9.4A Interactive Material Compatibility Tool.
1 - Minor Errata	14.20.2	14.20.2 Recommendations for Fixing Aluminium	Added "non-compressible" to point d.
1 - Minor Errata	15.4.8.1	15.4.9.1 Tray Roofing Wind Noise	Grammar fix.
1 - Minor Errata	3.4.6	3.4.6 Material Thickness	Punctuation fix.
1 - Minor Errata	3.4.1	3.4.1 Corrugate Profile	Grammar fix.
1 - Minor Errata	3.4	3.4 Profiles	Typo fix.
1 - Minor Errata	3	3 Structure	Punctuation fix.

2023 – September

19.6 2023 – September

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 September 2023.

Versioning and presentation:

Beginning with this revision the Code of Practice updates its version number with each update, to make it clear when the current update was published.
The version numbering uses a year.month pattern: for example this update is v23.09, where 23 indicates the year (2023) and 09 indicates the month (September).
Refer to 19 Revision History for a log of specific changes in each update.
An overall upgrade to styling for improved typeface readability and better contrast in headings.
Additionally there are new "Quick Actions" on the COP Home page for reference to updates and interactive tools, and the registration process has been streamlined.

Substantial change to recommendations:

16 Maintenance and all its sub-clauses have been comprehensively revised.
5.6.2 Sumps: Added recommendation to seal internal sumps against the sides and soles of the gutter.
14.19.3 Correctly Installed Gutters: Changed recommendation for gutter drainage to be more consistent with MBIE tolerances.
In 3 Structure, tables and graphs have been rearranged to correspond to whether the design is under NZS3604 or AS/NZS1170:
3.10 Fastening Pattern Tables – Designs to NZS 3604
3.11 Wind Load/Span Graphs – Designs to AS/NZS1170

Editing and rearrangement:

8.5.5 Apron Flashings: Corrected name for chase and face fastened flashing to Reglet flashings. Added definition to the Glossary.
9.4.2.6 Penetration Flashings on Trapezoidal Profiles: Clarified recommendations for trapezoidal sheet cover above the flashing when using under-soaker flashings.
Revised the Introduction to 3 Structure to make it easier for users to find the correct fastening pattern for NZS3604 or Wind Load/Span Graphs for SED (AS/NZS 1170) designs.
3.9 Fastener Requirements and Overhangs: renamed the clause.
4.9.4 Compatibility Table: Correction to use caution for contact between concrete and steel.
Revised 8.2A Notched Flashing illustration to recommend a screw fastener to the purlin in preference to a rivet.
7.3.2B Unfavourable Circumstances for Controlling Expansion: inserted vertical axis label: sheet length (m). Removed Pan Fixing as unfavourable condition for expansion control.
15.4.9 Standing Seam Roofing Wind Loads: Renamed table — Generic Standing Seam Clip Spacing.
12.2 Purlin Creasing: Copy editing for clarity.
8.2.1 Flashing Edges: Removed recommendation to provide longitudinal flashings with an anti-capillary gap, as this is impractical.

The rest of the updates consisted of minor corrections and edits.

19.6A Revision Detail - 2023 - September

Category	Clause Number (prior to update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Updated Revisions Message
2 - Editing and rearrangement	1.1	1.1 Disclaimer and Copyright	Removed copy explaining the update-policy and created a new subclause for those explanations.
4 - Clause Inserted		1.1.1 Code of Practice Update-Policy	Outline the update policy, new Version numbering scheme, and process for requesting archival content
2 - Editing and rearrangement	2.1	2.1 Definitions	Added definition for Reglet flashing.
4 - Clause Inserted		3.11 Wind Load/Span Graphs – Designs to AS/NZS1170	New clause to group 3.11.1 Steel Cladding Wind Load Span Graphs and 3.11.2 Aluminium Cladding Wind Load Span Graphs for designs to AS/NZS 1170.
2 - Editing and rearrangement	3	3 Structure	Revision of the introductory clause to clarify uses of 3.10 Fastening Pattern Tables – Designs to NZS 3604 and3.11 Wind Load/Span Graphs – Designs to AS/NZS1170.
1 - Minor Errata	3.2.1	3.2.1 AS/AZS 1170.2:2011	Fixed typo: amendments. Completed the last sentence and formatted the link to 3.7 Modes of Failure properly.
1 - Minor Errata	3.6.2.1	3.6.2.1 Wind Load	Resized photographs so they display the same.
1 - Minor Errata	3.6.2.2	3.6.2.2 Snow Loads	Grammatical fix for clarity.
1 - Minor Errata	3.7.2	3.7.2 Deflection	Fixed typo: distributed and roofing.
2 - Editing and rearrangement	3.9	3.9 Fastener Requirements and Overhangs	Clause has been renamed.
4 - Clause Inserted		3.10 Fastening Pattern Tables – Designs to NZS 3604	New clause to group 3.10.1 G550 Steel Roof Fastening Pattern Tables and 3.10.3 Aluminium Fastening Pattern Tables for NZS3604-designs.
3 - Substantial change to recommendation	4.9.4	4.9.4 Compatibility Table	Correction to "use with caution" for contact between concrete and steel. Removed brand names in favour of generic descriptive terms.
4 - Clause Inserted	4.15.1	4.15.1 Ground Clearance	New clause under 4.15 Clearances.
3 - Substantial change to recommendation	5.5.7	5.5.7 Valley Capacity Calculator	Enabled valley calculations for roofs at pitches below 3° - enforces a minimum freeboard of 30mm
3 - Substantial change to recommendation	5.6.2	5.6.2 Sumps	Added recommendation for internal sumps to be sealed against the sides and sole of the gutter. Some typo fixes.
1 - Minor Errata	6.2	6.2 Compliance	Fixed a missing link to: 7 External Moisture Roofing, 8 External Moisture Flashings, and 9 External Moisture Penetrations.
2 - Editing and rearrangement	8.2	8.2 Flashing Design	Revised 8.2A Notched Flashing illustration to recommend a screw fastener to the purlin in preference to a rivet.
2 - Editing and rearrangement	8.2.1	8.2.1 Flashing Edges	Removed recommendation to provide longitudinal flashings with an anti-capillary gap, as this is impractical.
4 - Clause Inserted		8.3 Metal Fascias and Facades	A new clause providing guidance for purpose-made Metal Fascias and Facades.
2 - Editing and rearrangement	8.4.4	8.5.5 Apron Flashings	Corrected name for 8.5.5H Parapet — Reglet Flashing, Chase Cut and 8.5.5I Parapet — Reglet Flashing, Face Fixed.
2 - Editing and rearrangement	9.4.2.6	9.4.2.6 Penetration Flashings on Trapezoidal Profiles	Clarifying text for fixing under-soaker flashing added to 9.4.2.6B Level Under-Soaker: Trapezoidal,
1 - Minor Errata	12	12 Fitness For Purpose	Fixed typo: Addition
1 - Minor Errata	13.3	13.3 Working on Roofs	Edited the caption under 13.3A Working on Roofs Safety Systems.
1 - Minor Errata	14.3	14.3 Accepting Delivery	Added clarifying statement to contact the supplier when the condition of the product is in doubt.
1 - Minor Errata	14.13.1	14.13.1 Nails	Photo of Nail Pull-Out rotated.
3 - Substantial change to recommendation	14.19.3	14.19.3 Correctly Installed Gutters	Changed recommendation for gutter drainage to be more consistent with MBIE tolerances.
1 - Minor Errata	15.1.1	15.1.7 Spring Curving	Updated reference to the tables in this clause.
1 - Minor Errata	15.1.6	15.1.6 Concave Roofs	Removed reference to a redundant table. Some grammar fixes.
1 - Minor Errata	15.1.9	15.1.11 Crimp Curving	Fixed a broken link to 16.8 Overpainting.
2 - Editing and rearrangement	15.4.8	15.4.9 Standing Seam Roofing Wind Loads	Renamed table, it is now called: Generic Standing Seam Clip Spacing and inserted Medium Wind Zone.
1 - Minor Errata	15.4.12.4	15.4.13.4 Finishing at Ridges and Eaves of Tray Roofing	Typo fix.
1 - Minor Errata	16	16 Maintenance	Some editing for accuracy.
4 - Clause Inserted		16.1 Maintenance Compliance	New clause inserted.
0 - Clause Removed	16.1	Improved Durability	Clause removed during the over-all revision of 16 Maintenance .
0 - Clause Removed	16.2	Normal Maintenance	This clause was removed during the over-all revision of 16 Maintenance
4 - Clause Inserted		16.3 Reactive Maintenance	New clause created during the over-all revision of 16 Maintenance .
3 - Substantial change to recommendation	16.3	16.4 Scheduled Maintenance	The clause was revised as part of the overall revision of 16 Maintenance .
3 - Substantial change to recommendation	16.4	16.5 Preventative Maintenance	This clause was revised during the overall revision of 16 Maintenance .
3 - Substantial change to recommendation	16.5	16.6 Special Maintenance	This clause was revised during the overall revision of 16 Maintenance .
3 - Substantial change to recommendation	16.6	16.2 Inspection	Clause revised as part of the over-all revision of 16 Maintenance .
3 - Substantial change to recommendation	16.7	16.7 Washing	This clause was revised during the overall revision of 16 Maintenance .
3 - Substantial change to recommendation	16.7.1	16.7.1 Lichen And Mould	THis clause was revised during the overall revision of 16 Maintenance .
2 - Editing and rearrangement	16.7.2	16.7.2 Graffiti	This clause was revised during the overall revision of 16 Maintenance .
3 - Substantial change to recommendation	16.8	16.8 Overpainting	This clause was revised during the overall revsion of 16 Maintenance .
4 - Clause Inserted		16.8.1 Preparation for Overpainting	New clause created during the overall revision of 16.8 Overpainting.
3 - Substantial change to recommendation	16.8.1	16.8.3 Unpainted Cladding	This clause has been revised during the overall revision of 16 Maintenance .
2 - Editing and rearrangement	16.8.2	16.8.4 Weathered Pre-Painted Cladding	This clause was revised during the overall revision of 16 Maintenance .
2 - Editing and rearrangement	16.8.3	16.8.1.1 White Corrosion	This clause has been revised during the overall revision of 16 Maintenance .
2 - Editing and rearrangement	16.8.4	16.8.1.2 Red Corrosion	This clause was revised during the overall revision of 16 Maintenance .
4 - Clause Inserted		16.8.5 Unweathered Pre-Painted Cladding	New clause created during the overall revision of 16 Maintenance .
3 - Substantial change to recommendation	16.8.5	16.8.2 Application	This clause has been renamed and completely revised during the overall revision of 16 Maintenance , previously independent clauses have also been incorporated. They are: Brush Application, Roller Application, Spray Application
0 - Clause Removed	16.8.6	Brush Application	This clause has been removed during the overall revison of 16 Maintenance . Brush Application is now discussed in 16.8.2 Application.
0 - Clause Removed	16.8.7	Roller Application	This clause has been removed during the overall revison of 16 Maintenance . Roller Application is now discussed in 16.8.2 Application.
0 - Clause Removed	16.8.8	Spray Application	This clause has been removed during the overall revison of 16 Maintenance . Spray Application is now discussed in 16.8.2 Application.
0 - Clause Removed	16.9	Material Selection	This clause was removed during an overall revision of 16 Maintenance .
0 - Clause Removed	16.9.1	Residential	This clause was removed during an overall revision of 16 Maintenance .
0 - Clause Removed	16.9.2	Commercial	This clause was removed during an overall revision of 16 Maintenance .
0 - Clause Removed	16.9.3	Responsibility and Liability	This clause was removed during an overall revision of 16 Maintenance .
0 - Clause Removed	16.9.4	Special Environments And Exclusions	This clause was removed during an overall revision of 16 Maintenance .
0 - Clause Removed	16.11	Storage	This clause was removed during an overall revision of 16 Maintenance . Storage is dealt with through various clauses under 14 Installation.
2 - Editing and rearrangement	18.2	18.2 Pitch & Rise Calculator	Renamed from "Roof Pitch Tangent" to "Pitch & Rise Calculator" for clarity.
2 - Editing and rearrangement	18.5	18.5 Geometry And Measurement	Renamed from "Geometry And Mensuration" to "Geometry And Measurement".
4 - Clause Inserted		19.6 2023 – September	New clause listing revisions for September 2023.

2023 – June

19.7 2023 – June

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 June 2023.

Substantial change to recommendations:

The main section 3 Structure has been comprehensively revised.

The revision comprises several changes throughout the main clause and sub-clauses.
Several clauses were revised in part or completely and illustrations were updated.
Clauses dealing with fastening patterns and SED Wind Load/Span Graphs are currently being reviewed pending ongoing MRM testing.

An interactive filter for fastener patterns and load/span graphs is now available in these clauses.

Design	Steel	Aluminium
NZS 3604	3.10.1 G550 Steel Roof Fastening Pattern Tables	3.10.3 Aluminium Fastening Pattern Tables
SED	3.11.1 Steel Cladding Wind Load Span Graphs	3.11.2 Aluminium Cladding Wind Load Span Graphs

Other important updates:

A new clause discusses 12.3 Flashing Buckling in more detail, while the old clause has been renamed Compression Timber.
Standing Seam Cladding has been renamed 15.4 Tray Roofing and the entire clause and its sub-clauses have been reviewed.
The definition of standing seam roofing (a form of tray roofing installed on solid sarking, using traditional seaming tools) has been clarified.

The rest of the updates consisted of minor corrections and edits.

19.7B Revision Detail - 2023 - June

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Updated Revisions Message
2 - Editing and rearrangement	2.1	2.1 Definitions	Clarified the definition of Standing Seam Profile.
3 - Substantial change to recommendation	3	3 Structure	The main clause Structure has been comprehensively revised. The revision comprises several changes thtoughout the main clause and sub-clauses
4 - Clause Inserted		3.2 Standards	New clause to group the standards refered to in 3 Structure in the COP.
0 - Clause Removed	3.2	General	This clause has been merged with the intorductory clause for 3 Structure.
3 - Substantial change to recommendation	3.3	3.2.1 AS/AZS 1170.2:2011	This clause has been revised as part of the overall revision of 3 Structure.
3 - Substantial change to recommendation	3.4	3.2.2 NZS 3604:2011	Changed the description of what NZS 3604 includes. Removed the statement that NZS 3604 is location specific.
4 - Clause Inserted		3.2.3 NASH Standard	New clause to mention the NASH Standard in relation to B1/AS1.
4 - Clause Inserted		3.3 Performance	New clause. This clause was filled with information previously available in the old clause 3.5.1 Understanding Loads
4 - Clause Inserted		3.3.1 Section Properties	New sub-clause discussing how to determine profile strength under load.
3 - Substantial change to recommendation	3.15	3.4 Profiles	This clause has been revised as part of the overall revision of 3 Structure. Some copy has been moved to 3.5.6 Section Properties
2 - Editing and rearrangement	3.15.1	3.4.1 Corrugate Profile	The clause has been revised as part of the overall revision of Structure.
2 - Editing and rearrangement	3.15.2	3.4.2 Trapezoidal Profile	revised as part of the overall revision of 3 Structure.
3 - Substantial change to recommendation	3.15.5	3.4.3 Miniature Profiles	Deleted reference to metrical or imperial sizing of miniture profiles.
3 - Substantial change to recommendation	3.15.3	3.4.4 Secret-fixed Profiles	Clause renamed and combined with 3.15.4 Standing Seam (removed). Added an illustration
3 - Substantial change to recommendation	3.13	3.4.5 Material Grade	Content had been revised and edited as part of the overall revision of 3 Structure.
3 - Substantial change to recommendation	3.14	3.4.6 Material Thickness	The content of this clause was revised as part of the overall revision of 3 Structure.
4 - Clause Inserted		3.5 Loads	New introductory clause leading into various clauses dealing with different loads.
3 - Substantial change to recommendation	3.5	3.5.1 Understanding Loads	The clause has been revised and edited as part of the overall revision of 3 Structure. The illustration of 3.3A Profiled Steel — Flanges and Webs and some content have been moved to 3.4 Profiles. The illustration 3.5.1A Compression, Tensile and Shear Force
0 - Clause Removed	3.5.1	Point Load	This clause has been removed as part of the overall revision of 3 Structure. Instead of two clauses
0 - Clause Removed	3.5.6	Section Properties	This clause was removed as part of the overall revision of 3 Structure. The information previous contained in this clause has been spread throughout other clauses.
3 - Substantial change to recommendation	3.5.8	3.5.1.1 Continuity	The content of this clause was revised and edited as part of the overall revision of 3 Structure. The illustration for 3.5.1.1A Continuity
2 - Editing and rearrangement	3.5.4	3.5.1.2 Load Distribution	The 3.5.1.2 Load Distribution-clause has been revised and edited as part of the overall revision of 3 Structure.
0 - Clause Removed	3.5.2	Wind Load	This clause was merged with 3.6.2.1 Wind Load as part of the overall revision of 3 Structure.
0 - Clause Removed	3.5.5	Yield Strength	This clause has been assimilated into a new clause
3 - Substantial change to recommendation	3.6	3.6 Types of Load	Clauses decribing types of load have been rearranged and revised for clarity and easy of use. Content previously contained to this clause was distributed among it's sub-clauses.
2 - Editing and rearrangement	3.6.1	3.6.1 Point Load	This clause revised as part of the overall revision of 3 Structure.
3 - Substantial change to recommendation	3.7	3.6.2.1 Wind Load	Two clauses that previously discussed wind load were merged into one as part of the overall revision of 3 Structure. The content of both clauses were revised and edited to facilitate the merger.
3 - Substantial change to recommendation	3.7.1	3.6.2.1.1 Local Pressure Factor (Kl)	Corrected illustration 3.6.2.1.1A Local Pressure for Low-Pitch Roofs and deleted C Local Pressure Factors C.
2 - Editing and rearrangement	3.7.2	3.6.2.1.2 Conversion of Wind Speed To Pressure	The content of this clause has been edited as part of a overall revision of 3 Structure.
2 - Editing and rearrangement	3.8	3.6.2.2 Snow Loads	This contents in this clause has been edited for conciseness as part of the overall revision of 3 Structure.
2 - Editing and rearrangement	3.7.3	3.6.2.3 Roof Weight	The content os this clause has been edited for clarity.
3 - Substantial change to recommendation	3.3.1	3.7 Modes of Failure	The contents of this clause has been edited as part of the overall revision of 3 Structure.
4 - Clause Inserted		3.7.1 Serviceability and Ultimate Failure	Newly created clause discussing Serviceability and Ultimate Failure.
3 - Substantial change to recommendation	3.5.3	3.7.2 Deflection	The content of this clause has been revised as part of the overall revision of 3 Structure. The contents have been merged with 3.5.5 Yield Strength
4 - Clause Inserted		3.7.3 Deformation	New clause made up of merged content from 3.7.2 Deflection and 3.5.5 Yield Strength.
3 - Substantial change to recommendation	3.6.2	3.7.4 Roof Traffic	The content of this has been edited to include a load of 2 kPa applied for accessible roofs.
3 - Substantial change to recommendation	3.9	3.7.5 Dead Loads	The content of this clause has been edited as part of the overall revision of 3 Structure.
2 - Editing and rearrangement	3.1	3.7.6 Construction Loads	The content is this clause has been revised as part of the overall revision of 3 Structure. A photo to illustrate rib damage due to construction loads was added.
3 - Substantial change to recommendation	3.5.7	3.7.7 Fatigue and Brittle Failure	The content of this clause has been revised as part of the overall revision of 3 Structure
4 - Clause Inserted		3.8 Fasteners	New introductory clause to sub-clauses dealing with structural requirements for fasteners.
3 - Substantial change to recommendation	3.11	3.8.1 Fastener Loads	The content is this clause has been revised as part of the overall revsion of 3 Structure.
3 - Substantial change to recommendation	3.12.1.1	3.8.2 Steel Purlins	This clause has been renamed and merged with 3.12.1 Screw Fasteners and 3.12.1.2 Steel Purlins Thicker Than 1 mm.
3 - Substantial change to recommendation	3.12.2	3.8.4 Pull-over Values	The content of this clause has been edited as part of the overall revision of 3 Structure. The copy was revised and the table A Typical Pull over values for crest fixing (serviceability failure) was removed.
2 - Editing and rearrangement	3.11.1	3.8.5 Load-spreading Washers	THis clause has been moved as part of the overall revision of 3 Structure. It now follows 3.8.4 Pull-over Values.
0 - Clause Removed	3.12	Fastener Performance	This clause has been merged with 3.8.1 Fastener Loads.
0 - Clause Removed	3.12.1	Screw Fasteners	This clause has been merged with 3.8.2 Steel Purlins .
0 - Clause Removed	3.12.1.2	Steel Purlins Thicker Than 1 mm	This clause was merged with 3.8.2 Steel Purlins .
0 - Clause Removed	3.15.4	Standing Seam	Clause was combined with 3.4.4 Secret-fixed Profiles.
1 - Minor Errata	4	4 Durability	Fixed typo.
3 - Substantial change to recommendation	4.9.4	4.9.4 Compatibility Table	Correction to the combination of Stainless Steel with Zinc or Zinc coated steel, where runoff from Stainless Steel is not suitable. Amendment of some material descriptions to more common industry terms (Galvanised steel, Colorsteel®/Colorcote®, Zincalume®). Addition of Painted Galvanised Steel.
2 - Editing and rearrangement	5.5.1	5.5.1 Valley Fixing	Rearranged layout.
3 - Substantial change to recommendation	5.5.6	5.5.6 Asymmetrical Valleys	Added recommendation for valley baffles where roof pitches excced 10°.
3 - Substantial change to recommendation	8.4.3	8.5.4 Parapet Cappings	This clause was comprehensivly reviewed and all the illustrations were updated.
1 - Minor Errata	8.4.4	8.5.5 Apron Flashings	Edited for clarity. Removed mention of 'hidden flashings' and inserted mention of B2/AS1.
1 - Minor Errata	8.4.4.4	8.5.5.4 Eaves Flashing	The illustration of 8.5.5.4A Gutter-Eaves Flashing has been amended to align with measurements from E2/AS1.
2 - Editing and rearrangement	8.8	8.9 Compression Timber	Clause renamed. Flashing buckling is discussed in 12.3 Flashing Buckling.
4 - Clause Inserted		12.3 Flashing Buckling	New clause discussing buckling of flashings.
1 - Minor Errata	14.11	14.11 Overhang	Drawing tidy up.
3 - Substantial change to recommendation	15.4	15.4 Tray Roofing	The entire clause 15.4 Tray Roofing
2 - Editing and rearrangement	15.4.1	15.4.1 Tray Roofing Materials	Renamed the couse to Tray Profile Materials.
2 - Editing and rearrangement	15.4.2	15.4.2 Tray Roofing Profiles	15.4 Tray Roofing has been revised and renamed to Self-Support and Standing Seam Profiles.
4 - Clause Inserted		15.4.3 Tray Roofing Design	New clause discussing standing seam design.
3 - Substantial change to recommendation	15.4.3	15.4.5 Tray Fixings	Standing Seam Fixings has been reviewed
1 - Minor Errata	15.4.5	15.4.7 Sarking	Provided full terminology for CPD (Control Panel Directive).
2 - Editing and rearrangement	15.4.6	15.4.8 Tray Ventilation	Standing Seam Ventilation has been renamed Tray Ventilation.
2 - Editing and rearrangement	15.4.7	15.4.9 Standing Seam Roofing Wind Loads	The clause Standing Seam Roofing Wind Loads has been renamed Tray Roofing Wind Loads.
4 - Clause Inserted		15.4.9.1 Tray Roofing Wind Noise	New Clause for Tray Roofing Wind Noise.
2 - Editing and rearrangement	15.4.8	15.4.10 Penetrations on Tray Roofing	The clause Penetrations on Standing Seam Cladding has been renamed to Penetrations on Tray Roofing.
3 - Substantial change to recommendation	15.4.10.3	15.4.11 Tray Roof Flashing	1. Clause and illustraions have been renamed
2 - Editing and rearrangement	15.4.9	15.4.12 Canning and Purlin Creasing	Removed last line to avoid confusion .
2 - Editing and rearrangement	15.4.10	15.4.13 Installing Tray Cladding	Clause renamed
4 - Clause Inserted		15.4.13.2 Commence Laying Tray Cladding	New clause discussing laying of tray cladding.
2 - Editing and rearrangement	15.4.10.2	15.4.13.3 Provision for Expansion — Tray Roofing	Photo from Installing Standing Seam Cladding has been moved to 15.4.13.3 Provision for Expansion — Tray Roofing. Clause has been renamed for consistency.
4 - Clause Inserted		15.4.13.4 Finishing at Ridges and Eaves of Tray Roofing	New clause describing tray roofing sheet end treatment.
1 - Minor Errata	17.1.5.1	17.1.5.1 Allowance for Variation	Corrected depreciation factor for clip-fastened products from 30% to 1.3.
4 - Clause Inserted		19.7 2023 – June	New clause with revision details for 1 June 2023.

2023 – March

19.8 2023 – March

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 March 2023.

Substantial changes to recommendations:

5.4.7 Gutter Capacity Calculator extended to include secret gutters, and gutter fall greater than 1:100.
New clause 5.2A Roof Drainage Terminology as used in the COP.
Opinion on small sheds and bay windows that do not require spouting.
Reviewed table 7.1.1 Minimum Roof Cladding Pitch and added maximum run.
Added design advice for scuppers in 5.4.5.1 Internal Gutter Design Features
Added advice for minimising roof noise in 15.4.9 Standing Seam Roofing Wind Loads.

Editing and rearrangement:

Freeboard for Internal Gutters has been increased to 30mm to align with COP calculator and E1/AS1
14.11A Minimum Overhang updated drawing. No change to recommendations.
14.17 Turndowns (Drip Forming or Drip Edging) reviewed copy to provide guidance for difficult-to-turn-down profiles, such as deep corrugated profiles.
2 Glossary added definitions for freeboard, internal gutters, hidden gutters, secret gutters, and raked spouting.
Updated illustrations detailing
8.5.3C Stepped Fascia Corrugate Over Barge, 8.5.3B Stepped Fascia Corrugate Under Barge,8.5.3E Stepped Fascia Trapezoidal Over Barge, 8.5.3D Stepped Fascia Trapezoidal Under Barge, 8.5.5H Parapet — Reglet Flashing, Chase Cut, 8.5.5I Parapet — Reglet Flashing, Face Fixed, 8.5.3F Tray Roofing-Wall Connection and 5.5.6A Valley Baffle.

Other changes consisted of small fixes for clarity and grammar.

19.8A Revision Detail - 2023 - March

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
3 - Substantial change to recommendation	5.3.7	5.4.7 Gutter Capacity Calculator	Gutter Capacity Calculator now supports calculation where gutter fall is greater than 1:100, and has an option for Secret Gutters (i.e. where a roof slopes towards a raking wall or barge).
3 - Substantial change to recommendation	7.1.1	7.1.1 Minimum Roof Cladding Pitch	Revised and renamed table 7.1.1A Minimum Pitch for Generic Metal Roofing.
4 - Clause Inserted		5.2 Roof Drainage Terminology	New clause to clarify COP usage of terminology pertaining to Roof Drainage.
4 - Clause Inserted		5.3.2.1 Designing for Climate Change	Newly introduced clause, recommending NIWA's HIRDS-tool.
4 - Clause Inserted		5.4.1.1 Bay Windows	New clause discussing drainage for Bay Windows.
4 - Clause Inserted		5.4.1.2 Outbuildings	New clause to give guidance on roof drainage for outbuildings.
2 - Editing and rearrangement	1	1 Introduction	Updated Revisions Message
2 - Editing and rearrangement	2.1	2.1 Definitions	Added definitions for Freeboard, Internal gutter, Hidden gutter, Secret gutter, and Raking Spouting.
1 - Minor Errata	3.5.2	3.5.2 Wind Load	Fixed broken link.
2 - Editing and rearrangement	5.3.5.1	5.4.5.1 Internal Gutter Design Features	Added clarifying text regarding scuppers.
2 - Editing and rearrangement	5.4.6	5.5.6 Asymmetrical Valleys	Included details drawing for installing a .
2 - Editing and rearrangement	8.3	8.4 Flashing Cover	Added clarification of rib cover to 8.4K Apron Flashing Cover — Trapezoidal.
2 - Editing and rearrangement	8.4.2	8.5.3 Barge And Verge	Added illustrations showing details for:8.5.3B Stepped Fascia Corrugate Under Barge; 8.5.3C Stepped Fascia Corrugate Over Barge; 8.5.3D Stepped Fascia Trapezoidal Under Barge; 8.5.3E Stepped Fascia Trapezoidal Over Barge; and 8.5.3F Tray Roofing-Wall Connection.
2 - Editing and rearrangement	8.4.4	8.5.5 Apron Flashings	Added illustration showing 8.5.5H Parapet — Reglet Flashing, Chase Cut and 8.5.5I Parapet — Reglet Flashing, Face Fixed.
1 - Minor Errata	14.16	14.16 Stop-ends	Minor edit for clarity.
2 - Editing and rearrangement	14.17	14.17 Turndowns (Drip Forming or Drip Edging)	Edited copy to provide guidance for difficult to turn down profiles, such as deep corrugated profiles.
4 - Clause Inserted		19.8 2023 – March	Revision and updates active 1 March 2023.

2022 – November

19.9 2022 – November

In a major update, effective 1 November 2022, the Clause 15.5 – previously 'Insulated Panels' – has been revised and extended.
The main clause has been renamed 15.5 Warm Roofs, and it now includes sub-clauses dealing with 15.5.1 Insulated Panels 15.5.2 Composite Systems and 15.5.3 Spray-On Systems.

Other notable updates include:

Changed recommendations for 5.5.6 Asymmetrical Valleys.
Changed recommendations for 15.4.9 Standing Seam Roofing Wind Loads to minimise wind noise.
The performance requirements quoted from 5.1 NZBC: Clause E1 — Surface Water has been expanded to better reflect the intent of NZBC E1 — Surface Water.
The 3.6.2.2B Altitudes for Snow Loading Design was renamed to remove ambiguity.
Roofing products with adhered absorbent fleece were added to 10.10 Ventilation Pathways.
15.4.11 Tray Roof Flashing details added to 15.4 Tray Roofing.

The rest of the updates consist of minor edits for clarity and layout.

19.9A Revision Detail - 2022 - November

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Updated Revisions Message
2 - Editing and rearrangement	3.8	3.6.2.2 Snow Loads	Table 3.6.2.2B Altitudes for Snow Loading Designn was renamed to remove ambiguity.
1 - Minor Errata	3.15	3.4 Profiles	Renamed Tray/Deck profiles to Standing Seam/Tray Profiles.
1 - Minor Errata	5.1	5.1 NZBC: Clause E1 — Surface Water	Expanded performance requirement in accordance with E1– Surface Water.
3 - Substantial change to recommendation	5.4.6	5.5.6 Asymmetrical Valleys	Changed recommendation in line with the most recent 5.5.7 Valley Capacity Calculator.
2 - Editing and rearrangement	10.1	10.10 Ventilation Pathways	Added fleece lined products.
1 - Minor Errata	12.1.1	12.1.1 Wind Noise	Added recommendation to reduce Underlay Flutter, by adding spray-on foam insulation.
2 - Editing and rearrangement	15.3.2	15.3.2 Valleys	Updated Reference to 5.5.7 Valley Capacity Calculator
2 - Editing and rearrangement	15.4.6	15.4.8 Tray Ventilation	Replaced 15.4.8A Standing Seam Ventilation with better quality image.
3 - Substantial change to recommendation	15.4.7	15.4.9 Standing Seam Roofing Wind Loads	Change in recommendation.
4 - Clause Inserted		15.4.11 Tray Roof Flashing	Newly created clause.
3 - Substantial change to recommendation	15.5	15.5 Warm Roofs	The main clause Insulated Panels have been renamed Warm Roofs. In addition to insulated panels, the clause also features composite roofs and spray-on systems.
2 - Editing and rearrangement	15.5.1	15.5.1.1 Insulated Panel Manufacturing	The clause Design under Insulated Panels has been comprehensively reviewed and edited. It is now called Insulated Panel manufacturing. The rest of the content is available in smaller sub-clauses throughout the new clause 15.5.1 Insulated Panels.
4 - Clause Inserted		15.5.1 Insulated Panels	Newly created clause for Insulated Panels.
4 - Clause Inserted		15.5.1.2 Insulated Panel Composition	Newly created clause.
4 - Clause Inserted		15.5.1.3 Insulated Panel Face Profiles	Newly created clause.
4 - Clause Inserted		15.5.1.6 Insulation Panel Insulation Values	Newly created clause.
4 - Clause Inserted		15.5.1.8 Natural Lighting for Insulated Panels	Newly created clause.
4 - Clause Inserted		15.5.1.11 Insulated Panels Fitness for Purpose	Newly created clause.
4 - Clause Inserted		15.5.1.12 Insulated Panel Installation	Newly created clause.
4 - Clause Inserted		15.5.1.13 Insulated Panel Installation Safety	Newly created clause.
4 - Clause Inserted		15.5.1.15 Insulated Panel Penetrations	Newly created clause.
4 - Clause Inserted		15.5.1.17 Insulated Panel End Laps	Newly created clause.
2 - Editing and rearrangement	15.5.2	15.5.1.4 Insulated Panel Face Materials	The clause has been comprehensively reviewed and edited.
4 - Clause Inserted		15.5.2 Composite Systems	Newly created clause.
4 - Clause Inserted		15.5.2.1 Composite Systems Composistion	Newly created clause.
4 - Clause Inserted		15.5.2.2 Composite System Installation	Newly created clause.
2 - Editing and rearrangement	15.5.3	15.5.1.5 Insulated Panel Core Materials	The clause has been comprehensively reviewed and edited.
4 - Clause Inserted		15.5.3 Spray-On Systems	Newly created clause.
4 - Clause Inserted		15.5.3.1 Ventilation of Spray-on Systems	Newly created clause.
2 - Editing and rearrangement	15.5.4	15.5.1.7 Insulation Panel Structure	This clause has been comprehensively reviewed and edited.
2 - Editing and rearrangement	15.5.4.1	15.5.1.14 Insulated Panels Supporting Structure	The clause has been comprehensively reviewed and renamed.
0 - Clause Removed	15.5.5	Thermal	Clause was removed during the revision of Insulated Panels.
0 - Clause Removed	15.5.5.1	Fire	Clause was removed during a revision of Insulated Panels.
2 - Editing and rearrangement	15.5.6	15.5.1.10 Insulated Panels and Internal Moisture	This clause has been comprehensively reviewed and renamed.
2 - Editing and rearrangement	15.5.7	15.5.1.9 Insulated Panel Acoustics	This clause has been comprehensively reviewed and edited.
3 - Substantial change to recommendation	15.5.8	15.5.1.16 Fixing Insulated Panels	This clause has been comprehensively revised and renamed.
2 - Editing and rearrangement	15.5.9	15.5.1.18 Insulated Panel Flashings	This clause has been comprehensively revised and renamed.
2 - Editing and rearrangement	17.3	17.3 MRM Soft Edge Standard	Editing for clarity.
4 - Clause Inserted		19.9 2022 – November	Revision summary for the November 2022 update.

2022 – June

19.10 2022 – June

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 June 2022.

Revised clauses:

Clause 15.4 Tray Roofing and all its sub-clauses were comprehensively revised for this update.

Change in recommendation:

3.10.3 Aluminium Fastening Pattern Tables: Corrected minimum depth of corrugated aluminium to 17 mm instead of 27 mm.
Added H36 to the headings for correct identification and product selection.

The rest of the updates consisted of minor changes, grammar fixes, and minor edits to improve clarity.

19.10A Revision Detail - 2022 - June

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
3 - Substantial change to recommendation	3.2	3.10.3 Aluminium Fastening Pattern Tables	Corrected minimum depth of corrugated aluminium to 17 mm instead of 27 mm. Added H36 to the headings for correct identification and product selection.
3 - Substantial change to recommendation	7.1.1	7.1.1 Minimum Roof Cladding Pitch	Added corrugated profiles with a height of more than 35 mm to 7.1.1A Minimum Pitch for Generic Metal Roofing.
3 - Substantial change to recommendation	8.3	8.4 Flashing Cover	Increased recommended cover for 8.4E Barge Flashing Cover — Trapezoidal and Secret Fixed and 8.4G Barge Flashing Cover — Corrugate Category C from 50 mm to 75 mm.
3 - Substantial change to recommendation	15.4	15.4 Tray Roofing	The entire clause 15.4 Tray Roofing, including all sub-clauses, had been revised.
3 - Substantial change to recommendation	15.4.3	15.4.1 Tray Roofing Materials	This sub-clause has been entirely revised as part of the revision of the main clause 15.4 Tray Roofing.
4 - Clause Inserted		15.4.2 Tray Roofing Profiles	New clause, inserted as part of a comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.5 Tray Fixings	New clause, inserted as part of a comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.6 Standing Seam End Laps	New clause, added as part of the comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.7 Sarking	New clause, introduced as part of a comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.8 Tray Ventilation	New clause, introduced during a comprehensive review of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.9 Standing Seam Roofing Wind Loads	New clause, introduced during comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.10 Penetrations on Tray Roofing	New clause, introduced during a comprehensive review of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.12 Canning and Purlin Creasing	New clause, introduced as part of a comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.13 Installing Tray Cladding	New clause, introduced as part of a comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.13.1 Tray Cladding Set Out	New clause, introduced a during a comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted		15.4.13.3 Provision for Expansion — Tray Roofing	New clause, introduced during a comprehensive revision of 15.4 Tray Roofing.
4 - Clause Inserted	19.1	19.10 2022 – June	Revision message June – 2022.
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
2 - Editing and rearrangement	3.18	3.10.1 G550 Steel Roof Fastening Pattern Tables	Edited table headings for improved readability. Inserted a table explaining wind speed as per NZS 3604.
1 - Minor Errata	9.4.2.3	9.4.2.3 Cricket Back Curbs	Grammar fix. Rewrote the last sentence.
1 - Minor Errata	17.1.2.2.3	17.1.2.2.3 Number of Spans	Clarification.
0 - Clause Removed	15.4.1	Self-Supporting Cladding	Clause removed during a comprehensive revision of 15.4 Tray Roofing. The subject is now discussed through various new sub-clauses.
0 - Clause Removed	15.4.2	Fully Supported Roof And Wall Cladding	Clause removed during a comprehensive revision of 15.4 Tray Roofing. For information about the subject, see 15.4.7 Sarking.
0 - Clause Removed	15.4.2.1	Types	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.2.2	Traditional Architectural Metal Panels	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.2.3	Long Length Strip Roof Cladding	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.2.4	Types Of Joints	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.2.5	Standing Seam	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.2.6	Angled Seam	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.2.7	Roll Cap	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.2.8	Transverse Laps	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.3.1	Copper	Clause removed as part of the overall revision of 15.4 Tray Roofing. For information about this material, see 4.16.5 Copper.
0 - Clause Removed	15.4.3.2	Zinc	Clause removed as part of the complete revision of 15.4 Tray Roofing. For information about this material see 4.16.4 Zinc.
0 - Clause Removed	15.4.3.3	Aluminium	Clause removed as part of the complete revision of 15.4 Tray Roofing. For information about this material see 4.16.3 Aluminium.
0 - Clause Removed	15.4.3.4	Stainless Steel	Clause removed as part of the complete revision of 15.4 Tray Roofing. Information about this material can be found at 4.16.2 Stainless Steel.
0 - Clause Removed	15.4.3.5	Coated Steel	Clause removed as part of the revision of 15.4 Tray Roofing, information about this product is still available in 4.16.1 Steel.
0 - Clause Removed	15.4.4	Loadings	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.4.1	Fixing	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.4.2	Substrate	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.4.3	Fasteners	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.5	Underlay	Clause removed during a comprehensive revision of 15.4 Tray Roofing. Information about underlay can be found in 10.11 Underlay.
0 - Clause Removed	15.4.6	Ventilation	Clause removed during a comprehensive revision of 15.4 Tray Roofing. The subject is now discussed in 15.4.8 Tray Ventilation.
0 - Clause Removed	15.4.7	Drainage	Clause removed during a comprehensive revision of 15.4 Tray Roofing. For information about drainage, see 5 Roof Drainage .
0 - Clause Removed	15.4.7.1	Valleys	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.8	Facade Cladding	This clause was removed during a comprehensive revision of 15.4 Tray Roofing. The subject is now discussed through various other sub-clauses.
0 - Clause Removed	15.4.9	Edge Finishes	This clause was removed during a comprehensive revision of 15.4 Tray Roofing, please see the new sub-clause 15.4.6 Standing Seam End Laps.
0 - Clause Removed	15.4.9.1	Ridge And Hip	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.9.2	Apron Or Abutment	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.9.3	Eaves And Verge	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.9.4	Penetrations	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.9.5	Cappings	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.10	Durability	Clause removed during a comprehensive revision of 15.4 Tray Roofing. For durability issues, see 15.4.10 Durability.
0 - Clause Removed	15.4.10.1	Patina Formation	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.10.2	Copper Patination	Clause removed as part of the overall revision of 15.4 Tray Roofing.
0 - Clause Removed	15.4.10.3	Zinc Patination	Clause removed as part of the overall revision of 15.4 Tray Roofing.

2022 – April

19.11 2022 – April

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 April 2022.

Change in recommendation:

4.9.1 Dissimilar Metals: Gutters and spouting made from materials which are incompatible with the roof cladding to include special provisions such as a gap between spouting and fascia, using leaf deflectors, and considering low fronted spouting.

Revised clauses:

8.4 Flashing Cover: Revision of the minimum requirements for flashing cover in the Metal Roofing Code of Practice. Drawings have been updated and a category C added for SED Wind Zones up to 60 m/s on all pitches.
10.10 Ventilation Pathways has completely revised for clarity. The revision includes a new recommendation to provide additional ventilation for trough or tray section roofs.

The rest of the updates consisted of minor changes, editing, and new drawings for 14 Installation, without any changes in recommendations.

19.11A Revision Detail - 2022 - April

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
3 - Substantial change to recommendation	4.9.1, 4.10.1	4.9.1 Dissimilar Metals	Change of recommendation for spouting and roof cladding made from incompatible material.
3 - Substantial change to recommendation	8.3	8.4 Flashing Cover	Clause has been completely revised.
3 - Substantial change to recommendation	10.1	10.10 Ventilation Pathways	Clause revised for clarity.
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
1 - Minor Errata	2.1, 2.1	2.1 Definitions	Added defintion for SED Wind Zone.
2 - Editing and rearrangement	3.15, 3.13	3.4 Profiles	Inserted new Drawing: Profile Types –
2 - Editing and rearrangement	5.3.7	5.4.7 Gutter Capacity Calculator	Enabled Profile Description Field to describe product.
1 - Minor Errata	5.4.7	5.5.7 Valley Capacity Calculator	Standardise internal structure - no user facing or operational changes.
1 - Minor Errata	5.6.3	5.7.3 Downpipe Capacity Calculator	Standardise internal structure - no user facing or operational changes.
2 - Editing and rearrangement	5.7.1	5.8.1 Maximum Area Above Spreader Calculator	Enabled Profile Description Field to describe product.
2 - Editing and rearrangement	7.1.4	7.1.4 Maximum Run Calculator	Enabled Profile Description Field to describe product.
2 - Editing and rearrangement	8.3.2	8.2.1 Flashing Edges	Copy moved from 8.4 Flashing Cover to this clause.
4 - Clause Inserted		8.4.1 Apron Upstands	New clause created from 8.4 Flashing Cover.
4 - Clause Inserted		8.4.2 Clearances	New clause created from 8.4 Flashing Cover.
4 - Clause Inserted		8.4.3 Ridging and Other Transverse Flashings	New clause created from 8.4 Flashing Cover.
1 - Minor Errata	8.4.4.4	8.5.5.4 Eaves Flashing	Corrected reference typo E1/AS1 to E2/AS1.
2 - Editing and rearrangement	9.4.4	9.4.4 Maximum Area Above Penetration Calculator	Enabled Profile Description Field to describe product.
1 - Minor Errata	10.10.1.2	10.10.1.2 Fascia Vents	Grammar fix.
4 - Clause Inserted		10.10.1.4 Vented Soft Edge	New clause.
2 - Editing and rearrangement	10.10.1	10.10.1 Methods of Ventilation	Clause renamed.
1 - Minor Errata	10.10.2	10.10.2 Battens	Grammatical fix for clarity.
4 - Clause Inserted		10.10.3 Applied Fleeces	New Clause.
2 - Editing and rearrangement	14.13.2	14.13.2 Screws	Updated drawings: 14.13.2D Screw Gauge and 14.13.2E Threads per Inch (TPI).
2 - Editing and rearrangement	14.16	14.16 Stop-ends	Drawings updated: 14.16A Dog-eared Stop-ends, 14.16B Pull-up Stopends, and 14.16C Corrugate Stop-ends.
2 - Editing and rearrangement	14.17	14.17 Turndowns (Drip Forming or Drip Edging)	UPdated drawing: 14.17A Profile Turndown
2 - Editing and rearrangement	14.19.1	14.19.1 Roof Cladding Damage	Drawing updated: 14.19.1A Sealed and Riveted Saddle
2 - Editing and rearrangement	14.3.1	14.3.1 Unloading	Drawing updated: 14.3.1A Sling with Spreader Bar.
2 - Editing and rearrangement	14.6	14.6 Walking On Roofs	Drawings updated: 14.6A Walking in the Pan and 14.6B Spreading Weight over two Ribs.
4 - Clause Inserted		19.11 2022 – April	Revision message – April 2022.

2021 – December

19.12 2021 – December

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 December 2021.

Summary of Changes in this update:

Update to 5A Capacity Calculations: These have now all been updated to require input of both 10 and 50 year ARI. This allows the calculators to automatically incorporate the correct ARI for the specifics of the project. Both values are retained when you select a different calculator or return for another project.
Complete revision of clause 12.1 Roof Noise.
Complete revision of clause 4.10.3 Solar Collectors and Other Roof Mounted Structures.
Change of recommendation for 3.10.1 G550 Steel Roof Fastening Pattern Tablesin Extra High Wind Zones. Recommendation amended from C2 pattern to C3.

The rest of this update comprises minor edits and fixes.

19.12A Revision Detail - 2021 - December

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
3 - Substantial change to recommendation	3.17.1	3.11.1.1 Corrugated Steel – 0.40	Drawing edited to change C2 recommendation to stay below Very High.
3 - Substantial change to recommendation	3.17.2	3.11.1.2 Corrugated Steel – 0.55	Changed recommendation for C2, to only be used below Very High Wind Zones.
3 - Substantial change to recommendation	4.10.3	4.10.3 Solar Collectors and Other Roof Mounted Structures	Clause has been completely revised.
3 - Substantial change to recommendation	8.8	8.9 Compression Timber	Changed recommended minimum moisture content to 12% following advice from Scion .
3 - Substantial change to recommendation	12.1	12.1 Roof Noise	This clause has been substatially revised. Some-subsections have been promoted to headings and some had been deleted a part of the revision.
4 - Clause Inserted		12.1.1 Wind Noise	New clause, raised and revised from former sub-sub clause of Roof Noise.
4 - Clause Inserted		12.1.2 Precipitation Noise	Newly created clause from the revised Roof Noise.
4 - Clause Inserted		12.1.3 Thermal Noise	New clause, information elevated from the revised Roof Noise.
4 - Clause Inserted		19.12 2021 – December	Revision message for the 1 December 2021 Update.
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
2 - Editing and rearrangement	5.3.7	5.4.7 Gutter Capacity Calculator	All calculators now require input of both 50 year and 10 year ARI.
2 - Editing and rearrangement	5.4.7	5.5.7 Valley Capacity Calculator	All calculators now require input of both 50 year and 10 year ARI.
2 - Editing and rearrangement	5.6.3	5.7.3 Downpipe Capacity Calculator	All calculators now require input of both 50 year and 10 year ARI.
2 - Editing and rearrangement	5.7.1	5.8.1 Maximum Area Above Spreader Calculator	All calculators now require input of both 50 year and 10 year ARI.
2 - Editing and rearrangement	7.1.4	7.1.4 Maximum Run Calculator	All calculators now require input of both 50 year and 10 year ARI.
2 - Editing and rearrangement	9.4.4	9.4.4 Maximum Area Above Penetration Calculator	All calculators now require input of both 50 year and 10 year ARI.
1 - Minor Errata	1.3	1.3 Standards and Related Documents	Fixed column spacing.
1 - Minor Errata	2.1	2.1 Definitions	Clarified definitions for tray, trough, standing seam, and secret fixed profiles.
1 - Minor Errata	3.6.2	3.7.4 Roof Traffic	Changed "trademan" to trades people for gender neutrality.
1 - Minor Errata	3.18	3.10.1 G550 Steel Roof Fastening Pattern Tables	Fixed grammar for consistency. Fixed drawings to show C2 fastening pattern.
2 - Editing and rearrangement	4.6.2	4.6.2 Environmental Guides	Envrinmental guides redone for improved display on all browers.
1 - Minor Errata	15.1	15.1 Curved Roofs	Grammar fix.
1 - Minor Errata	16.8	16.8 Overpainting	slight formatting change for improved reading.

2021 – September

19.13 2021 – September

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 September 2021.

Summary of Changes in this update:

In an important update, the recommendation for freeboard for internal gutters on the 5.4.7 Gutter Capacity Calculator was changed to 30mm to align with E1/AS1 and E1/AS2.
The recommendation for minimum suitable pitch for 9.1 Penetrations Minimum Pitch, has been amended to include modern proprietary profiles.
New clauses with easy-to-use fastener pattern reference tables. The tables would cover most standard corrugated and trapezoidal cladding, for 3.10.1 G550 Steel Roof Fastening Pattern Tables and 3.10.3 Aluminium Fastening Pattern Tables.
Other new clauses were for 5.5.4 Intersecting Valleys and 14.8 Double Lapping.
The drawing in 5.8 Downpipe Spreaders was replaced to give a clearer reflection of the downpipe design and using the online downpipe spreader capacity calculator.

The rest of this update consisted of fixing minor errors.

19.13A Revision Detail - 2021 - September

Category	Clause (As of current publication)	Details
2 - Editing and rearrangement	1 Introduction	Update Revisions Message
4 - Clause Inserted	3.10.1 G550 Steel Roof Fastening Pattern Tables	New clause aimed at easy reference of fastening patterns.
4 - Clause Inserted	3.10.3 Aluminium Fastening Pattern Tables	New clause for easy referencing of fastening patterns for aluminium cladding.
1 - Minor Errata	3.7.4 Roof Traffic	Changed "tradesman" to trades people for gender neutrality.
1 - Minor Errata	3.6.2 Uniformly Distributed Load (Wind or Induced Action)	Corrected spelling of "Uniformly. Included a full term before the abbreviation for UDL in the first sentence.
2 - Editing and rearrangement	5.4.3 Internal Corners	Clause moved from Valleys to Gutters.
3 - Substantial change to recommendation	5.4.7 Gutter Capacity Calculator	The minimum Freeboard on internal gutter calculations has been changed to 30mm to align with E1/AS1 and E1/AS2.
1 - Minor Errata	5.5.2 Valley Design	Inserted cross-reference link to Internal Corners.
4 - Clause Inserted	5.5.4 Intersecting Valleys	New clause showing the correct way to intersect valleys.
2 - Editing and rearrangement	5.8 Downpipe Spreaders	Replaced Downpipe Spreader Design-drawing with a more detailed one.
3 - Substantial change to recommendation	9.1 Penetrations Minimum Pitch	Revised first sentence to make allowance for modern profiles and proprietary profiles.
4 - Clause Inserted	14.8 Double Lapping	New clause.
4 - Clause Inserted	19.13 2021 – September	New Revision clause

2021 – June

19.14 2021 – June

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 June 2021.

COP Clauses 11 Natural Light and 14 Installation were comprehensively reviewed and revised for this update. Users are advised to reread those clauses for the most up-to-date information and recommendations.

Other updates included minor fixes to grammar, layout, and updated drawings and dividing 4.9.4 Compatibility Table into smaller, more usable clauses (with no change to recommendations).

19.14A Revision Detail - 2021 - June

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
1 - Minor Errata	3.5.2	3.5.2 Wind Load	Some rewording for clarity.
1 - Minor Errata	4.10.1	4.9.1 Dissimilar Metals	Editing for clarity.
2 - Editing and rearrangement	4.10.3	4.9.4 Compatibility Table	The clause was split for ease of use.
3 - Substantial change to recommendation	5.2.2.2	5.3.2.3 Allowance for Short-Term Intensities	Updated Short-term Intensity Factor Explanation.
1 - Minor Errata	5.4.2	5.5.2 Valley Design	UPdated link to the Valley Capacity Calculator.
2 - Editing and rearrangement	8.4.4.4	8.5.5.4 Eaves Flashing	Inserted a paragraph recommending eaves flashings in Marine Environments.
2 - Editing and rearrangement	10.9	10.9 Minimising Ingress of Water Vapour into the Ceiling Cavity	Clause renamed and revised for clarity.
3 - Substantial change to recommendation	11	11 Natural Light	COP Clause 11. Natural Light has been completely revised.
3 - Substantial change to recommendation	11.1	11.1 Clause G7 NZBC	COP Clause 11. Natural Light has been entrile revised.
3 - Substantial change to recommendation	11.2	11.2 Natural Light Materials	COP clause 11. Natural Light has been revised, which includes the clause previously titled "Materials".
0 - Clause Removed	11.3	Types Of Roof Lights	This clause was removed as part of an overall revision of COP clause 11. Natural Light. Illustration of different rooflights can be found in Thermal Expansion and
3 - Substantial change to recommendation	11.4	11.5 Light Transmission	Clause has been revised as part of an overall revision of COP Clause 11. Natural Light.
0 - Clause Removed	11.5	Weathering And Durability	This clause has been removed as part of an overall revision of COP Clause 11. Natural Light. Information about translucent sheeting durability can now be found at Natural Light Performance - Durability,
3 - Substantial change to recommendation	11.6	11.3 Performance – Structure	Clause renamed and content added.
2 - Editing and rearrangement	11.6.1	11.3.1 Point Load on Translucent Sheets	Clause revised and renamed as part of the overall revision of COP Clause 11. Natural Light.
2 - Editing and rearrangement	11.6.2	11.3.2 Distributed Loads on Translucent Sheeting	Clause revised and renamed as part of the overall revision of COP Clause 11. Natural Light.
3 - Substantial change to recommendation	11.7	11.4 Thermal Resistance	Clause has been revised as part of an overall revision of COP Clause 11. Natural Light.
3 - Substantial change to recommendation	14	14 Installation	COP Clause 14. Installation has been significantly reviewed and revised.
1 - Minor Errata	14.1	14.11 Overhang	Drawing tidy up.
3 - Substantial change to recommendation	14.1	14.1 Pre- Installation	This clause has been revised as part of an overall revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.2.2	14.2.2 Ordering	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.2.3	14.2.3 Transportation	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.3	14.3 Accepting Delivery	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.3.1	14.3.1 Unloading	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.3.2	14.3.2 Wet Storage Damage	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.6	14.6 Walking On Roofs	This clause has been reviewed as part of a substantial overall revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.6.1	14.6.1 Footwear	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.7	14.7 Strippable Films	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
4 - Clause Inserted	14.7.1	14.7.1 Storing Product with Strippable Film	This clause has been removed as part of a substantial revision of COP Clause 14. Installation. For handling and storage of products with strippable film, please see Strippable Films.
0 - Clause Removed	14.7.2	Using Strippable Film	This clause has been removed as part of a substantial revision of COP Clause 14. Installation. For using and handling products with strippable film, please see Strippable Films.
1 - Minor Errata	14.9	14.10 Marking and Cutting	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
2 - Editing and rearrangement	14.12.2	14.13.2 Screws	Added "Reduced Diameter Drill Point" to Screw Points. This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
1 - Minor Errata	14.12.3	14.13.3 Clip Fasteners	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.12.4	14.13.4 Rivets	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
1 - Minor Errata	14.13	14.14 Fastener Installation	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
4 - Clause Inserted	14.15	14.16 Stop-ends	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
1 - Minor Errata	14.16	14.17 Turndowns (Drip Forming or Drip Edging)	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
1 - Minor Errata	14.18	14.19 Avoiding Problems	This clause has been renamed as part of an overall revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.18.1	14.19.1 Roof Cladding Damage	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.18.2	14.19.2 Water Ponding	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.18.3	14.19.3 Correctly Installed Gutters	This clause has been reviewed as part of a substantial revision of COP Clause .
3 - Substantial change to recommendation	14.18.4	14.19.4 Swarf Damage	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
0 - Clause Removed	14.18.4.1	Identifying Swarf Stains	This clause has been removed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.18.4.2	14.19.4.1 Preventing Swarf Damage	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
0 - Clause Removed	14.18.4.3	Swarf Effect on Performance	This clause has been reviewed as part of an overall revision of COP Clause 14. Installation. For more information about swarf effects, please read Swarf Staining and Cut Edge Corrosion.
0 - Clause Removed	14.18.4.4	Repairing Swarf Damage	This clause has been reviewed as part of an overall revision of COP Clause 14. Installation. For more information about dealing with swarf, see Swarf Damage.
2 - Editing and rearrangement	14.18.5	14.19.5 Colour Matching Paint	Inserted picture. This clause has been reviewed as part of an overall revision of COP Clause 14. Installation.
2 - Editing and rearrangement	14.18.7	14.19.7 Sunscreen	Inserted photo of sunscreen damage. This clause has been reviewed as part of an overall revision of COP Clause 14. Installation.
0 - Clause Removed	14.18.8	Removing Lichen	This clause has been removed as part of an overall revision of COP Clause 14. Installation. For information about Lichen, see Lichen.
0 - Clause Removed	14.18.9	Gutter Installation	This clause has been removed as part of an overall revision of COP Clause 14. Installation. For Information about gutters, see Gutters.
1 - Minor Errata	14.19	14.20 Fixing Aluminium Sheeting	Grammar fix. This clause has been reviewed as part of an overall revision of COP Clause 14. Installation.
1 - Minor Errata	14.19.2	14.20.2 Recommendations for Fixing Aluminium	Fixed a link.
4 - Clause Inserted		11.8 Flatsheet Rooflights	New clause created as part of an overall revision of COP Clause 11. Natural Light.
4 - Clause Inserted		14.12.2 Side Laps	New clause created as part of a substantial revision of COP Clause 14. Installation.
4 - Clause Inserted		11.7 Stand-Alone Rooflights	New clause created as part of an overall revision of COP Clause 11. Natural Light.
4 - Clause Inserted		11.6 Installing Translucent Sheets	New clause under COP Clause 11. Natural Light.
4 - Clause Inserted		Natural Light Performance - Durability	New clause.
4 - Clause Inserted		11.1.1 Compliance	New clause dealing with natural light and compliance to NZBC G7.
4 - Clause Inserted		19.14 2021 – June	Revision message for the update on 1 June 2021.

2021 – March

19.15 2021 – March

The addition of an interactive calculator for asymmetrical valleys constitutes the most important inclusion in this update.

The other capacity calculators have all been refined and positioned for improved usability.

19.15A Capacity Calculators

Gutter Capacity	5.4.7 Gutter Capacity Calculator
Valley Capacity (both symmetrical and asymmetrical)	5.5.7 Valley Capacity Calculator
Downpipe Capacity	5.7.3 Downpipe Capacity Calculator
Maximum Area Above Spreaders	5.8.1 Maximum Area Above Spreader Calculator
Maximum Area Above Penetrations	9.4.4 Maximum Area Above Penetration Calculator
Maximum Run	7.1.4 Maximum Run Calculator

In addition, various drawings have been updated for accuracy and correctness.

The rest of this update consisted of fixing minor errors and improvements for clarity.

19.15B Revision Detail - 2021 - March

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
1 - Minor Errata	2.1	2.1 Definitions	Added definitions for Translucent, Transparent, Opalescent, and Opaque.
1 - Minor Errata	3.13	3.4.5 Material Grade	Minor revision for Aluminium.
0 - Clause Removed	4.8	Biological Corrosion	Clause removed. 4.8.4 Lichen is now in 4.8 Paint Durability, and 4.10.9 Gutter Leaf Guard is now in 4.10 Other Causes of Corrosion.
2 - Editing and rearrangement	5.3.7	5.5.7 Valley Capacity Calculator	Updated calculator to support Asymmetrical Valley calculations, including dynamic illustration.
2 - Editing and rearrangement	5.5.2	5.8.1 Maximum Area Above Spreader Calculator	Clause edited, new clause (Downpipe Spreaders) introduced with explanatory text about spreaders. Trapezoidal illustration updated to show effective pan-depth area.
2 - Editing and rearrangement	5.6	5.4.2 Gutter Capacity Design	Clause renamed and moved to Types of Gutter.
1 - Minor Errata	5.6.2	5.4.2.3 Spouting Support Systems	Clause moved to Gutter Installation and Maintenance.
2 - Editing and rearrangement	5.6.3	14.18.9 Gutter Installation	Clause renamed and moved to Pre-empting Problems.
2 - Editing and rearrangement	5.7.1	5.8 Downpipe Spreaders	Previously removed clause, now reinstated and updated to align with the new Maximum Area Above Spreader Calculator.
1 - Minor Errata	5.7.2	5.4.2.1 Gutter Fall	Clause moved to Gutter Installation and Maintenance.
2 - Editing and rearrangement	5.7.5	5.7.3 Downpipe Capacity Calculator	Illustration updated to show effective head.
2 - Editing and rearrangement	5.8	5.4.7 Gutter Capacity Calculator	Rectangular Gutter illustration updated to show effective gutter area. Clause renamed to refine search results.
0 - Clause Removed	6.2	Acceptable Solution NZBC E2/AS1	Clause removed as it pertains to E2, which is discussed in NZBC Clause E2 External Moisture (Extract).
2 - Editing and rearrangement	6.2.1	6.2 Compliance	Clause promoted, replacing ES/AS1 at postion 6.2, and content of clause reviewed.
2 - Editing and rearrangement	7.1.4	7.1.4 Maximum Run Calculator	Trapezoidal illustration updated to show effective pan-depth area.
2 - Editing and rearrangement	7.4	7.4 End Laps	Drawing deleted, replaced with a reference to 14.12.1 Sealing End Laps.
2 - Editing and rearrangement	8.7	8.8 Profile Closures	Clause revised. Recommendations have not changed. Drawings replaced with more accurate depictions.
2 - Editing and rearrangement	9.4.4	9.4.4 Maximum Area Above Penetration Calculator	Trapezoidal illustration updated to show effective pan-depth area.
2 - Editing and rearrangement	14.11.1	14.12.1 Sealing End Laps	Drawing replaced with with more accurate depiction of correctly and incorrectly sealed end laps.
1 - Minor Errata	15.4.4.2	15.4.4.2 Substrate	Removed empty link.
4 - Clause Inserted		19.15 2021 – March	New Revision clause.

2020 – December

19.16 2020 – December

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 December 2020.

Summary of Changes in this update:

We introduced three more responsive tools to aid in roof drainage design. They are:

7.1.4 Maximum Run Calculator: Calculating the maximum roof length of any profile, at any pitch, and for any rainfall intensity to achieve effective roof drainage.
5.8.1 Maximum Area Above Spreader Calculator: To calculate the maximum allowable area feeding into spreaders.
9.4.4 Maximum Area Above Penetration Calculator: To calculate the maximum allowable area above roof penetrations.

The rest of this update consisted of fixing minor errors and improvements for clarity.

19.16A Revision Detail - 2020 - December

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
1 - Minor Errata	1.3	1.3 Standards and Related Documents	Clause renamed.
1 - Minor Errata	4.10.1	4.9.1 Dissimilar Metals	Formatting fix.
1 - Minor Errata	4.10.3	4.9.4 Compatibility Table	Removed reference to Butly Rubber into its own clause 4.9.3 Compatibility with Non-Metallic Substances.
2 - Editing and rearrangement	4.12	4.11 Inert Catchment	Inserted photo "Localised Damage due to Inert Catchment".
1 - Minor Errata	5.2.4.6	5.5.6 Asymmetrical Valleys	Punctuation fix.
2 - Editing and rearrangement	5.2.5	7.1.3 Roof Drainage Capacity	Clause renamed to more accurately reflect its content.
4 - Clause Inserted	5.4.3	5.8.1 Maximum Area Above Spreader Calculator	New online tool for calculating maximum drainage areas for spreaders.
1 - Minor Errata	5.5	5.4.2 Gutter Capacity Design	Grammar fix.
2 - Editing and rearrangement	5.6.3	5.3.2 Rainfall Intensity	Rainfall intensity maps have been added to this clause. Links to rainfall maps have been included in the calculators.
1 - Minor Errata	5.6.3.2	5.3.2.3 Allowance for Short-Term Intensities	Updated short-term intensity multiplication factors.
2 - Editing and rearrangement	5.7	5.4.7 Gutter Capacity Calculator	Renamed the clause. Other capacity calculators have been moved closer to the relevant information dealing with each topic.
0 - Clause Removed	5.7.1	North Island 50-year ARI, 10-minute Rainfall Intensity Map	Map moved to 5.3.2 Rainfall Intensity.
0 - Clause Removed	5.7.2	South Island 50-year ARI, 10-minute Rainfall Intensity Map	Map moved to 5.3.2 Rainfall Intensity.
3 - Substantial change to recommendation	7.1.2	7.1.2 Runoff	Clause completely revised.
4 - Clause Inserted	7.1.3	7.1.4 Maximum Run Calculator	New online tool to calculate maximum run for drainage of different roofing profiles.
2 - Editing and rearrangement	8.4.4.4	8.5.5.4 Eaves Flashing	Inserted a paragraph recommending eaves flashings in Marine Environments.
1 - Minor Errata	9.4.2	9.4.2 Curb Design	Introductory copy added.
4 - Clause Inserted	9.4.4	9.4.4 Maximum Area Above Penetration Calculator	New online tool for calculating the maximum area above a penetration.
1 - Minor Errata	17.2.3.1	17.2.3.1 Site Testing	Updated the graph.
4 - Clause Inserted		4.9.3 Compatibility with Non-Metallic Substances	A new clause, previously part of "4.10.3 Compatibility Table". Information was split since this is not part of the table or online tool.
4 - Clause Inserted		5.5.7 Valley Capacity Calculator	New clause created for Valley Capacity Calculator. The calculator was previously part of Capacity Calculators.
4 - Clause Inserted		5.7.3 Downpipe Capacity Calculator	New clause for Downpipe Capacity Calculators.
4 - Clause Inserted		19.16 2020 – December	New clause showing updates effective on 1 December 2020.

2020 – September

19.17 2020 – September

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP) were published on 1 September 2020.

Summary of Changes in this update:

New standard added for 17.4 MRM Pre-Painted Coil Standard – Performance Requirements.
Additional information on salt contamination added to 4.2 Metal Corrosion.
Revised 2.1 Definitions of Gutter and Valley.
The rest of this update consisted of fixing minor errors and improvements for clarity.

19.17A Revision Detail - 2020 - September

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
2 - Editing and rearrangement	2.1	2.1 Definitions	Revised definitions of Gutter and Valley.
2 - Editing and rearrangement	4.2	4.2 Metal Corrosion	Added paragraph about salt contamination.
1 - Minor Errata	5.7	5.4.7 Gutter Capacity Calculator	Clarity improvement. Inserted the Comment: "Please read with Roof Drainage Design "
1 - Minor Errata	9.3	9.3 Penetration Durability and Compatibility	Renamed clause to be more reflective of its content.
1 - Minor Errata	12.4.1	12.5.1 Touch-Up	Changed punctuation in heading for consistency.
2 - Editing and rearrangement	15.2	15.2 Mounting Air Conditioning, Aerials, and Solar Units	Clause has been renamed and new copy included.
2 - Editing and rearrangement	17	17 Testing and MRM Standards	Added introduction.
1 - Minor Errata	18.6	18.6 Velocities	Removed extra heading.
1 - Minor Errata	18.7	18.7 Cricket Penetration Patterns	Fixed headings.
4 - Clause Inserted		17.4 MRM Pre-Painted Coil Standard – Performance Requirements	New clause.
4 - Clause Inserted		17.4.1 Part1: ASNZS/2728:2013	New clause.
4 - Clause Inserted		17.4.2 Part 2: Additional Criteria	New clause.
4 - Clause Inserted		17.4.3 Commentary	New clause.
4 - Clause Inserted		17.4.4 Appendices of AS/NZS 2728:2013 included as Normative in the MRM Standard	New clause.
4 - Clause Inserted		17.4.5 Appendices of AS/NZS2728:2013 considered Informative in the MRM Standard:	New clause.
4 - Clause Inserted		17.4.6 Copyright Acknowledgement	New clause.

2020 – June

19.18 2020 – June

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 June 2020.

New clauses:

In this update, we included new clauses concerning 17.2 MRM Fastener Performance Requirements and Testing and 17.3 MRM Soft Edge Standard.
We updated 3.9 Fastener Requirements and Overhangs to include 3.11.2 Aluminium Cladding Wind Load Span Graphs.
We added a new table 5.3.3 Minimum Freeboard Values to 5.3 Roof Drainage Design and implemented interface refinements to 5.4.7 Gutter Capacity Calculator.

The rest of this update consists of minor improvements, such as tidying up drawings and edits for clarity and grammar.

19.18A Revision Detail - 2020 - June

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
2 - Editing and rearrangement	3.16.4	3.9.3 Fastener Patterns	Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5	3.11.1 Steel Cladding Wind Load Span Graphs	Clause renamed.
2 - Editing and rearrangement	3.16.5.1	3.11.1.1 Corrugated Steel – 0.40	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.3	3.11.1.2 Corrugated Steel – 0.55	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.2	3.11.1.3 Trapezoidal Five Rib Steel – 0.40	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.4	3.11.1.4 Trapezoidal Five Rib Steel – 0.55	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.5	3.11.1.5 Trapezoidal Six Rib Steel – 0.40	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.6	3.11.1.6 Trapezoidal Six Rib Steel – 0.55	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
4 - Clause Inserted		3.11.2 Aluminium Cladding Wind Load Span Graphs	New clause.
4 - Clause Inserted		3.11.2.1 Corrugated Aluminium – 0.70	New Clause for Aluminium Cladding Wind Load Span Graphs.
4 - Clause Inserted		3.11.2.1 Corrugated Aluminium – 0.90	New Clause for Aluminium Cladding Wind Load Span Graphs.
4 - Clause Inserted		3.11.2.3 Trapezoidal Five Rib Aluminium – 0.70	New Clause for Aluminium Cladding Wind Load Span Graphs.
4 - Clause Inserted		3.11.2.2 Trapezoidal Five Rib Aluminium – 0.90	New Clause for Aluminium Cladding Wind Load Span Graphs.
3 - Substantial change to recommendation	5.6.3	5.3.2 Rainfall Intensity	Clause had been completely revised, with updated Rainfall Intensity Maps at the end of the main Clause, Roof Drainage.
1 - Minor Errata	5.6.3.1	5.3.2.2 Duration	Replaced comparison chart with a simplified one.
2 - Editing and rearrangement	8.3	8.4 Flashing Cover	Added minimum flashing cover values for change of pitch junctions.
4 - Clause Inserted		17 Testing and MRM Standards	New clause.
2 - Editing and rearrangement	17	17.1 Metal Cladding Testing	Clause renamed.
1 - Minor Errata	17.5.1	17.1.5.1 Allowance for Variation	Fixed "overall" to "over all"
4 - Clause Inserted		17.2 MRM Fastener Performance Requirements and Testing	New clause.
4 - Clause Inserted		17.2.1 Requirements for Fastener Testing	New clause.
4 - Clause Inserted		17.2.2 Test Panel Requirements	New Clause.
4 - Clause Inserted		17.2.2.1 Test Location	New Clause.
4 - Clause Inserted		17.2.2.2 Site Orientation	New Clause.
4 - Clause Inserted		17.2.2.3 Preparation of Test Panel	New Clause.
4 - Clause Inserted		17.2.3 Fastener Performance Testing	New Clause.
4 - Clause Inserted		17.2.3.1 Site Testing	New clause.
4 - Clause Inserted		17.2.3.2 Field Performance Validation	New clause.
4 - Clause Inserted		17.2.3.3 Accelerated Testing	New clause.
4 - Clause Inserted		17.2.3.4 Fastener Shanks	New clause.
4 - Clause Inserted		17.2.3.5 Sealing Washer Conductivity	New clause.
4 - Clause Inserted		17.2.4 Appearance	New clause.
4 - Clause Inserted		17.2.5 Weatherproofing	New Clause.
4 - Clause Inserted		17.2.6 Fastener Performance Test Report	New clause.
4 - Clause Inserted		17.3 MRM Soft Edge Standard	New clause.
4 - Clause Inserted		17.3.1 Soft Edge Product Techincal Statement Requirements	New clause.
4 - Clause Inserted		19.18 2020 – June	New clause. Revision detail.
0 - Clause Removed	5.5	Gutters	The clause had been removed. Gutters are now discussed in more detail in a separate clause for each type, under the main clause Types of Gutter.

2020 – March

19.19 2020 – March

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 March 2020.

This update contains only minor revisions, mostly concerning grammar and punctuation fixes.

Editing and rearrangement for clarity

Corrected "upstand angles" of valleys to 90°, removed "Upstand Angles" from Internal Valley Angle Table.
Replaced Comparison of 10-Minute Published Intensity with 1-Minute and 2-Minute Intensities-chart with a simplified chart only showing comparison for 10-year and 50-year ARI.

19.19A Revision Detail - 2020 - March

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
1 - Minor Errata	5.2	5.4 Gutters	Easier to read layout options.
1 - Minor Errata	5.2.1	5.4.1 External Gutters (Spouting)	Grammar fix.
1 - Minor Errata	5.2.3	5.4.5 Internal Gutters	Grammar fix.
2 - Editing and rearrangement	5.2.4.2	5.5.2 Valley Design	Removed references to "Upstand Angle B" and replaced drawing "Common Valley Shapes"
1 - Minor Errata	5.2.4.6	5.5.6 Asymmetrical Valleys	Punctuation fix.
1 - Minor Errata	5.3.1	5.6.1 Rainwater Heads	Punctuation fix.
1 - Minor Errata	5.3.2	5.6.2 Sumps	Typo fix.
1 - Minor Errata	5.4	5.7 Outlets and Downpipes	Punctuation fix.
1 - Minor Errata	5.5.3	14.18.9 Gutter Installation	Minor Typo Fix.
1 - Minor Errata	5.6.2	5.4.2.1 Gutter Fall	Typo fix.
1 - Minor Errata	5.6.3.1	5.3.2.2 Duration	Replaced comparison chart with a simplified one.
1 - Minor Errata	8.9.1	8.10.1 Flashing Expansion	Grammar fix.

2019 – December

19.20 2019 – December

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 December 2019.

Major Revisions

For this update, the COP section 5 Roof Drainage and all its sub-clauses have been substantially revised. The updates focussed heavily on creating new online tools for calculating Roof Drainage, Gutter Capacity, Downpipe Capacity and Valley Capacity, which are located in 5.4.7 Gutter Capacity Calculator.

Summary of other changes in this update

All the content in 5 Roof Drainage has been updated to provide clarity and brevity, and detail drawings are updated.
The previous methods of capacity calculations, using two distinct methods based on standard sizes, have been removed and replaced by online calculator in 5.4.7 Gutter Capacity Calculator.
New clauses have been added for 17.1.3.2 Point Load Testing and 17.1.1.2 Point Load Testing Standard under 17.1 Metal Cladding Testing.
The Glossary has been updated with 2.1A Definitions for Swiss Gable, Finial, and Profiled Washer; and some minor edits to refine definitions and grammar fixes.

19.20A Revision Detail - 2019 - December

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
2 - Editing and rearrangement	2.1	2.1 Definitions	Revised definition of "Load Spreading Washer", added a new item "Profiled Washer", added definition for "Finial", minor grammatical fixes.
2 - Editing and rearrangement	5	5 Roof Drainage	The entire Roof Drainage-clause had been revised.
1 - Minor Errata	5.1	5.1 NZBC: Clause E1 — Surface Water	Formatting
4 - Clause Inserted		5.4 Gutters	New clause.
4 - Clause Inserted		5.4.1 External Gutters (Spouting)	New clause.
2 - Editing and rearrangement	5.5.5	5.4.4 Concealed Fascia Gutters	This clause had been completely revised and renamed.
2 - Editing and rearrangement	5.5.4	5.4.5 Internal Gutters	Clause completely revised.
4 - Clause Inserted		5.4.5.1 Internal Gutter Design Features	New clause.
2 - Editing and rearrangement	5.6	5.5 Valleys	Valleys had been completely revised and divided into smaller, more specific, sections.
4 - Clause Inserted		5.5.1 Valley Fixing	New clause.
4 - Clause Inserted		5.5.2 Valley Design	New clause.
4 - Clause Inserted		5.4.3 Internal Corners	New clause.
2 - Editing and rearrangement	5.6.2	5.5.3 Bifurcated Valleys	The clause had been revised. Valleys are now discussed in smaller, more specific, clauses.
4 - Clause Inserted		5.5.5 Changing Angles in Valleys	New clause.
4 - Clause Inserted		5.5.6 Asymmetrical Valleys	New clause.
4 - Clause Inserted		7.1.3 Roof Drainage Capacity	New clause.
3 - Substantial change to recommendation	5.5.7	5.4.6 Secret Gutters	Clause revised, for brevity and clarity.
4 - Clause Inserted		5.6 Rainwater Heads, Sumps, and Overflows	New clause.
2 - Editing and rearrangement	5.8.1	5.6.1 Rainwater Heads	Clause revised, now providing more information.
2 - Editing and rearrangement	5.8	5.6.2 Sumps	This clause has been revised.
2 - Editing and rearrangement	5.8.2	5.6.3 Overflows	Clause renamed, Outlets are now discussed under Outlets and Downpipes.
4 - Clause Inserted		5.7 Outlets and Downpipes	New clause.
4 - Clause Inserted		5.7.1 Placement of Downpipes	New clause.
4 - Clause Inserted		5.7.2 Capacity Table for Common Size Downpipes	New clause.
2 - Editing and rearrangement	5.5.1	5.4.2 Gutter Capacity Design	Clause has been revised and edited.
4 - Clause Inserted		5.4.2.2 Maximum Gutter Length	New clause.
2 - Editing and rearrangement	5.5.2	5.4.2.3 Spouting Support Systems	Clause revised.
4 - Clause Inserted		14.18.9 Gutter Installation	New clause.
2 - Editing and rearrangement	5.2	5.3 Roof Drainage Design	Clause had been completely revised.
2 - Editing and rearrangement	5.3.1	5.3.1 Catchment Area	Caluse has been completely revised. All calculations are now under a new clause Capacity Calculations.
2 - Editing and rearrangement	5.5.8	5.4.2.1 Gutter Fall	Clause revised and renamed.
3 - Substantial change to recommendation	5.3	5.3.2 Rainfall Intensity	Clause had been completely revised, with updated Rainfall Intensity Maps at the end of the main Clause, Roof Drainage.
4 - Clause Inserted		5.3.2.3 Allowance for Short-Term Intensities	New clause.
4 - Clause Inserted		5.3.2.2 Duration	New clause
2 - Editing and rearrangement	5.3.2	5.4.7 Gutter Capacity Calculator	The old clause, Capacity Calculations, replaced by a new clause of the same name but including new online tools.
4 - Clause Inserted		5.7.1 North Island 50-year ARI, 10-minute Rainfall Intensity Map	New clause.
4 - Clause Inserted		5.7.2 South Island 50-year ARI, 10-minute Rainfall Intensity Map	New clause.
4 - Clause Inserted	8.3	8.4 Flashing Cover	Adjusted spacing in Table 8.3A
2 - Editing and rearrangement	8.4.4.3	8.5.5.3 Step Apron	Removed reference to "Fortress Fasteners" in drawing A: Step Apron Details.
4 - Clause Inserted	8.4.4.4	8.5.5.4 Eaves Flashing	Drawing 8.4.4.4A renamed to Gutter Flashing.
2 - Editing and rearrangement	12.2	12.2 Purlin Creasing	Inserted photograph.
4 - Clause Inserted	17.1.2	17.1.1.2 Point Load Testing Standard	New Clause.
4 - Clause Inserted	17.3.2	17.1.3.2 Point Load Testing	New clause.
1 - Minor Errata	18.8	18.8 Sheet Metal Work For Roofing Contractors.	Clause revised for gender neutrality. No significant changes.
4 - Clause Inserted		19.20 2019 – December	Summary of Changes – December 2019
0 - Clause Removed	5.3.2.1	Method 1: Gutter and Downpipe Capacity Determined by Graph	These methods have been replaced by online capacity calculating tools.
0 - Clause Removed	5.3.2.3	Method 2: Gutter and Downpipe Capacity Determined by Calculations	These methods have been replaced by online capacity calculating tools.
0 - Clause Removed	5.3.3	Roof Cladding Capacity	These methods have been replaced by online capacity calculating tools.
0 - Clause Removed	5.4	Snow	Clause removed, Snow and hail are comprehensively discussed in Snow Loads.
0 - Clause Removed	5.4.1	Hail	Clause removed. Leaf guards and maintenance are discussed under Gutter Maintenance.
0 - Clause Removed	5.5	Gutters	The clause had been removed. Gutters are now discussed in more detail in a separate clause for each type, under the main clause Types of Gutter.
0 - Clause Removed	5.5.3	Eaves Gutters	Clause deleted. Now discussed under External Gutters.
0 - Clause Removed	5.6.1	Valley Catchment	This clause had been replaced with the newly developed online tool in Valley Capacity Calculations.
0 - Clause Removed	5.7	Downpipes	Information previously contained in this clause is now discussed in Outlets and Downpipes.
Out-of-band updates 16/12/2019
2 - Editing and rearrangement	5.4.2A	5.7.2 Capacity Table for Common Size Downpipes	Removed obsolete column for Roof Area Drained as the online calculator replaces this.
2 - Editing and rearrangement	5.7	5.4.7 Gutter Capacity Calculator	Added link to Common Sized Downpipes.

2019 – August

19.21 2019 – August

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 August 2019.

Major Revisions

The main clause 17.1 Metal Cladding Testing was substantially revised to give more practical guidance for testing in accordance with the NZ MRM Code of Practice.
The main clause 13 Safety has been substantially revised and updated to closer reflect the Health and Safety at Work Act 2015, referencing the documents Worksafe: Working on Roofs and Worksafe: Working at Height in New Zealand.
The sub-clause 14.20A Fixing Aluminium has been substantially revised to better reflect good trade practice and manufacturers’ recommendations.

Summary of other changes in this update

9.4 Penetration Design has been reorganised so sheetmetal back curb designs are now shown in different clauses for corrugated and trapezoidal profiles.
9.4 Penetration Design now includes an easy-use-use guide for penetration flashing design.
Previously missing design details have been added for 9.4.2.6F Cricket Under-Soaker: Trapezoidal and 9.4.2.6D Arrowhead Under-Soaker: Trapezoidal.
Trough Section and Standing Seam have been added to 3.4 Profiles descriptions in Structure.

19.21A Revision Detail - 2019 - August

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
4 - Clause Inserted		19.21 2019 – August	Summary of Changes – August 2019
1 - Minor Errata	10.5	10.5 Building Airtightness	Minor erata: changed 36.2 to 3602
0 - Clause Removed	9.4	Penetration Positioning	Clause is now included in Penetration Design.
2 - Editing and rearrangement	9.5	9.4 Penetration Design	Revised clause. Penetration Positioning is now included in this clause.
1 - Minor Errata	14.8	14.9 Setting Out	Typo correction
4 - Clause Inserted	9.6	9.5 Boot Flashings	Changed the word profile to profiles for consistency with the rest of the document.
4 - Clause Inserted		9.4.2.4 Penetration Flashings Reference	New clause to compare penetration flashing options.
2 - Editing and rearrangement	9.5.3	9.4.1.2 Under-Soaker Back Flashings	Clause renamed for consistency.
1 - Minor Errata	9.5.4.3	9.4.2.3 Cricket Back Curbs	Changed kerb to curb for consistency.
1 - Minor Errata	8.3	8.4 Flashing Cover	Corrected a misprint, removed <20mm from aprons, category B.
1 - Minor Errata	14.13.4	14.14.4 Fastener Allowance for Expansion	Fixed 8 mm for style consistency.
2 - Editing and rearrangement	14.12.1	14.13.1 Nails	Photo of Nail Pull-Out inserted.
4 - Clause Inserted		14.20.1 Painted Aluminium	Newly created clause dealing with Painted Aluminum products
4 - Clause Inserted		14.20.2 Recommendations for Fixing Aluminium	Newly created clause setting out COP recommendations for fixing aluminium claddding.
0 - Clause Removed	13	Site Practice	Clause removed. Topics previously discussed in Site Practice is now dealt with in more detail in various clauses under Installation.
3 - Substantial change to recommendation	13.1	13 Safety	Safety has been updated in accordance with the Health and Safety at Work Act 2015 (HSWA 2015).
3 - Substantial change to recommendation	13.1.1	13.2 Responsibilities	Clause updated in accordance with the Health and Safety at Work Act (HSWA) 2015.
3 - Substantial change to recommendation	13.1.7	13.4.1 Scaffolding	Clause has been substantially revised in accordance with Worksafe: Working at height in New Zealand.
3 - Substantial change to recommendation	13.1.10	13.4.3 Safety Mesh	This clause has been substantially revised in accordance with Worksafe: Working at Height in New Zealand.
4 - Clause Inserted		13.4.6 Safety Harness	New clause.
4 - Clause Inserted		13.4.7 Soft Landing Systems	New clause.
2 - Editing and rearrangement	14.21	14.22 Tools Of The Trade	Picture added: Turn Up and Turn Down Tools.
2 - Editing and rearrangement	9.5.2	9.4.1.1 Over-Flashed (Watershed) Back Flashings	Clause has been renamed.
0 - Clause Removed	13.1.2	Training	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.5	Limitations Of Fall Arrest And Travel Restraint	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.4	Residential And Light Commercial Roofing	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.13	Roof Access During Construction	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.12	Joining Safety Mesh	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.11	Steel Fixing	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.9	Personal Safety	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.8	Mobile Scaffolds	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.6	Access	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
4 - Clause Inserted		13.4.5 Mechanical Access Plant	New clause.
4 - Clause Inserted		13.4.4 Safety Netting	New clause.
4 - Clause Inserted		13.3.3 Weather Conditions	New clause.
4 - Clause Inserted		13.3.2 Assessment of Existing Roof Cladding	New clause.
4 - Clause Inserted		13.3.1 Safe Access to Roofs	New clause.
4 - Clause Inserted		13.3 Working on Roofs	New clause.
4 - Clause Inserted		13.2.4.1 Other People's Responsibilities	New clause.
4 - Clause Inserted		13.2.4 Other People	New clause.
4 - Clause Inserted		13.2.1 PCBU	New clause.
4 - Clause Inserted		13.2.3.1 Workers' Responsibilities	New clause.
4 - Clause Inserted		13.2.3 Workers	New clause.
4 - Clause Inserted		13.2.2.1 Officer Responsibilities	New clause.
4 - Clause Inserted		13.2.2 Officers	New clause.
4 - Clause Inserted		13.2.1.1 PCBU Responsibilities	New clause.
4 - Clause Inserted	9.5.5	9.4.2.5 Penetration Flashings on Corrugated Profiles	This clause has been revised and renamed to specifically show sheetmetal flashings on corrugated profiles.
4 - Clause Inserted		3.15.4 Standing Seam	New clause.
4 - Clause Inserted		3.4.4 Secret-fixed Profiles	New clause.
2 - Editing and rearrangement	14.3.2	14.3.2 Wet Storage Damage	Removed reference to "Fretting".
2 - Editing and rearrangement	2.1	2.1 Definitions	Updated Glossary item: "Fretting"
2 - Editing and rearrangement	4.12	4.11 Inert Catchment	Inserted photo "Localised Damage due to Inert Catchment".
1 - Minor Errata	14.4	14.4 Site Safety	Fixed link: Safety
1 - Minor Errata	14.5	14.5 Handling	Minor grammatical fix.
1 - Minor Errata	14.7.1	14.7.1 Storing Product with Strippable Film	Grammar fix.
1 - Minor Errata	14.7.2	14.7.2 Using Strippable Film	Grammar fix.
1 - Minor Errata	14.1	14.11 Overhang	Drawing tidy up.
4 - Clause Inserted		17.1 Metal Cladding Testing	New Clause, to replace Testing.
4 - Clause Inserted		17.1.1 Standards: AS Standards and COP Testing Standard	New clause.
4 - Clause Inserted		17.1.2 Test Requirements	New Clause
4 - Clause Inserted		17.1.2.1 Supporting Structure and Equipment	New Clause
4 - Clause Inserted		17.1.2.2 Test Set-up	New clause.
4 - Clause Inserted		17.1.2.2.1 Number of Specimens	New clause.
4 - Clause Inserted		17.1.2.2.2 Width of Specimen	New clause.
4 - Clause Inserted		17.1.2.2.3 Number of Spans	New clause.
4 - Clause Inserted		17.1.3 Testing Procedure	New clause.
4 - Clause Inserted		17.1.3.1 UDL Testing	New clause.
4 - Clause Inserted		17.1.5 Publishing Results	New clause.
4 - Clause Inserted		17.1.5.1 Allowance for Variation	New clause.
0 - Clause Removed	17	Testing	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.2	Background to Scope	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.1	Scope	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.3	General Methods Of Testing Sheet Roof And Wall Cladding	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.4	Commentary On 16.3	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.5	Determining Wind load Span Graphs	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.6	Specific Methods Of Testing Sheet Roof And Wall Cladding	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.7	Wind and Point Load Testing	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.8	Method: Resistance To Wind Pressures For New Zealand	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.9	Background to wind load testing	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
4 - Clause Inserted		17.1.5.3 Interpreting Point Load Results	New clause.
4 - Clause Inserted		17.1.3.2 Point Load Testing	New clause.
4 - Clause Inserted		17.1.1.1 UDL Load Testing Standard	New clause.
4 - Clause Inserted		9.4.2.7 Cricket Over-Flashing More Than 1 m Wide	New clause.
4 - Clause Inserted		9.4.3 Dormer Details	New clause.
4 - Clause Inserted		17.1.1.2 Point Load Testing Standard	New Clause.
1 - Minor Errata	14.2.2	14.2.2 Ordering	Punctuation fix.
3 - Substantial change to recommendation	13.1.3.1	13.4.2 Roof Edge Protection	Clause has been substantially revised in accordance with Worksafe: Working at Height in New Zealand.
3 - Substantial change to recommendation	13.1.3	13.4 Working At Height	Clause has been substantially revised in accordance with the HSWA 2015.
4 - Clause Inserted		9.4.2.6 Penetration Flashings on Trapezoidal Profiles	New clause, specifically showing penetration flashings on trapezoidal profiles.
3 - Substantial change to recommendation	14.19	14.20 Fixing Aluminium Sheeting	Section comprehensively revised to better reflect good trade practice and Manufacturer’s recommendations.
2 - Editing and rearrangement	3.15	3.4 Profiles	Inserted new Drawing: Profile Types
2 - Editing and rearrangement	3.15.2	3.4.2 Trapezoidal Profile	Removed drawing in favour of a more descriptive drawing: Profile Types.
4 - Clause Inserted	9.5.1	9.4.1 Penetration Back Flashings	Table removed.
4 - Clause Inserted		17.1.4 Test Report	New clause.
4 - Clause Inserted		17.1.5.2 Interpreting UDL Load Results	New clause.
4 - Clause Inserted		17.1.3.2 Point Load Testing	New clause.

2019 – May

19.22 2019 – May

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 May 2019.

Important updates:

The main clause Roof Ventilation was renamed 10 Internal Moisture and completely revised and updated. The revised clause recommends designing and installing roof cladding to allow natural ventilation in residential buildings and requires design to enable ventilation in skillion, sarked, and low-pitched residential roofs.

Summary of other changes in this update

The main clause 14 Installation was revised and updated for clarity.
Some clauses from 13 Site Practice were moved to be included in the more relevant clause Installation. Site Practice now contains mainly 13 Safety.
Some clauses in 17 Testing were renamed and renumbered to fix broken links and reflect content more accurately. A major revision of 17 Testing is underway.
Other changes are Category 1 updates, which fixed minor errata such as grammar, spelling, and layout.

19.22A Revision Detail - 2019 - May

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	2.1	2.1 Definitions	Updated Glossary to include the terms: "Square Stopping".
2 - Editing and rearrangement	3.5.4	3.5.1.2 Load Distribution	Minor edit to drawing (3.5.1.2C Deflection and the Square of Depth )
1 - Minor Errata	3.12.1.1	3.8.2 Steel Purlins	Edited for Consistency – changed 1.1 mm to 1 mm.
1 - Minor Errata	4.1	4.1 NZBC Clause B2 (Extract)	Revised for clarity.
1 - Minor Errata	4.1.1	4.1.1 B2 Objective	Reformatting
1 - Minor Errata	4.1.2	4.1.2 B2 Functional Requirements	Reformatting
1 - Minor Errata	4.1.3	4.1.3 Performance Requirements	Reformatting
2 - Editing and rearrangement	4.11.6	4.10.6 Capillary Action	Changed minimum cover in 4.10.6B Roofing Sheet End Lap to closer reflect MRM recommendations and renamed the drawing.
1 - Minor Errata	5.3.2.3	5.3.2.3 Method 2: Gutter and Downpipe Capacity Determined by Calculations	Fixed broken link to E Standard Gutter Capacity and F Standard Down Pipe Capacity, and rewrote link copy for greater clarity.
2 - Editing and rearrangement	8.9.1	8.10.1 Flashing Expansion	First line revised for clarity.
2 - Editing and rearrangement	10	10 Internal Moisture	Clause renamed to Internal Moisture. Clause revised for clarity.
2 - Editing and rearrangement	10.1	10.9 Minimising Ingress of Water Vapour into the Ceiling Cavity	Clause renamed and revised for clarity.
4 - Clause Inserted	10.1.1	10.1.1 E3 Objective	New Clause
4 - Clause Inserted	10.1.2	10.1.2 E3 Functional Requirements	New Clause created
4 - Clause Inserted	10.1.3	10.1.3 E3 Performance Requirements	New clause created.
4 - Clause Inserted	10.2	10.2 Why Manage Internal Moisture	Newly created clause
2 - Editing and rearrangement	10.4	10.3 Special Requirements	Clause revised for clarity and relevance.
0 - Clause Removed	10.4	10.4 The External Environment	Clause removed, information has been revised and moved to other main clauses.
2 - Editing and rearrangement	10.5	10.4 Condensation	Clause completely rewritten.
2 - Editing and rearrangement	10.6	10.5 Building Airtightness	Clause completely rewritten.
0 - Clause Removed	10.6.1	10.6.1 Natural Ventilation	Clause removed. New drawings used in more relevant clauses.
4 - Clause Inserted	10.7	10.6 Insulation	Newly created clause.
4 - Clause Inserted	10.7.1	10.6.1 Insulation Position	Newly created clause
4 - Clause Inserted	10.7.2	10.6.2 Other Insulation	Newly created clause
0 - Clause Removed	10.7.4.1	10.7.4.1 Direction of Lay	Clause delted. Information is now discussed in Horizontal laying and Vertical laying.
0 - Clause Removed	10.7.5	10.7.5 Non-Residential Buildings	Clause removed. Information is discussed elsewhere.
2 - Editing and rearrangement	10.8	10.7 Climate	Clause revised for clarity.
0 - Clause Removed	10.8	10.8 Wall Underlay	Clause removed and content discussed i other relevant clauses.
4 - Clause Inserted	10.8.1	10.7.1 Humidity	Relative humidity (RH, given in per cent [%]), is the most widely known method: It gives the content of water vapour in the air relative to the maximum amount of water this parcel of air can hold at its present temperature. Other measures are absolute humidity and water vapour pressure.
2 - Editing and rearrangement	10.9	10.8 Moisture Sources	Renamed and revised clause for clarity. Lead clause for various "Sources of Internal Moisture"
4 - Clause Inserted	10.9.1	10.8.1 Occupant Behaviour	Newly created clause, combining new information with some from revised "Managing Water Vapout at the Source" (renamed Sources of Internal Moisture).
4 - Clause Inserted	10.9.2	10.8.2 Heating	Newly created clause
2 - Editing and rearrangement	10.9.4	10.8.4 Construction Moisture	Clause revised for clarity.
4 - Clause Inserted	10.9.5	10.8.5 Ground Moisture	Newly created clause
2 - Editing and rearrangement	10.11	10.10 Ventilation Pathways	Clause revised for clarity.
4 - Clause Inserted	10.11.1	10.10.1 Methods of Ventilation	Newly created clause
4 - Clause Inserted	10.11.1.1	10.10.1.1 Soffit Vents	Newly created clause.
4 - Clause Inserted	10.11.1.2	10.10.1.2 Fascia Vents	Newly created clause
4 - Clause Inserted	10.11.1.3	10.10.1.3 Ridge Vents	Clause renamed and revised for clarity.
2 - Editing and rearrangement	10.11.1.4	10.10.1.5 Turbine Vents	Clause revised for clarity.
4 - Clause Inserted	10.11.2	10.10.2 Battens	Newly Created clause.
2 - Editing and rearrangement	10.12	10.11 Underlay	Clause revised and expanded for clarity.
4 - Clause Inserted	10.12.1	10.11.2 Underlay Requirements	Newly created clause.
2 - Editing and rearrangement	10.12.2	10.11.3 Types Of Underlay	Clause revised for clarity.
4 - Clause Inserted	10.12.3	10.11.4 Underlay Usage	Clause revised for clarity.
2 - Editing and rearrangement	10.12.4	10.11.5 Underlay Durability	Clause revised and expanded.
2 - Editing and rearrangement	10.12.5	10.11.6 Installing Underlay	Clause revised and expanded.
4 - Clause Inserted	10.12.5.1	10.11.6.1 Horizontal Laying	Newly created clause.
4 - Clause Inserted	10.12.5.2	10.11.6.2 Vertical Laying	Newly created clause.
2 - Editing and rearrangement	10.12.5.3	10.11.6.3 Underlay Support	Clause revised.
2 - Editing and rearrangement	10.13	10.12 Additional Information	Clause renamed to Additional Information.
2 - Editing and rearrangement	10.13.1	10.12.1 Cold Roofs	Clause revied for clarity.
2 - Editing and rearrangement	10.13.2	10.12.2 Warm Roofs	Clause revised for clarity.
2 - Editing and rearrangement	10.13.3	10.12.3 Night Sky Radiation	Clause revised for clarity.
2 - Editing and rearrangement	10.13.4	10.12.4 The Mechanics of Condensation	Clause revised and renamed, it is now: The Mechanics of Condesation.
4 - Clause Inserted	10.13.5	10.11.1 Underlay Standards	Newly created clause.
4 - Clause Inserted	10.13.6	10.12.5 Relative Humidity	Newly created clause
4 - Clause Inserted	10.13.7	10.12.6 Absolute Humidity	Newly created clause
4 - Clause Inserted	10.13.8	10.12.7 Water Vapour Pressure	Newly created clause
2 - Editing and rearrangement	13.2	13.1.13 Roof Access During Construction	Clause movved to 13 Safety
0 - Clause Removed	13.4	13.4 Acceptance Of Materials	class="views-field views-field-field-revision-message-revision-id">
0 - Clause Removed	13.4.1	13.4.1 Presence Of Moisture Between Sheets	Clause combined with 14.3.2 Wet Storage Damage
0 - Clause Removed	13.4.2	13.4.2 Colour Match	Clause combined with 14.19.5 Colour Matching Paint
0 - Clause Removed	13.4.3	13.4.3 Storage Stain	Clause removed.
0 - Clause Removed	13.5	13.5 Roof Loading	Clause combined with 14.3.1 Unloading
2 - Editing and rearrangement	14	14 Installation	Clause revised for clarity.
2 - Editing and rearrangement	14.1	14.1 Pre- Installation	Clause revised for clarity.
2 - Editing and rearrangement	14.1	14.11 Overhang	Clause revised for clarity
0 - Clause Removed	14.1	14.10 Metal Roof Defects	Clause removed. See 14.19.1 Roof Cladding Damage
0 - Clause Removed	14.1.5	14.1.5 Cutting And Drilling	Clause deleted. Information was spread through other clauses, mainly 14.18.4.4 Repairing Swarf Damage
4 - Clause Inserted	14.2	14.2 Product Selection	Newly Created Clause
2 - Editing and rearrangement	14.2	14.21 Completion	Clause revised for clarity.
4 - Clause Inserted	14.2.1	14.2.1 Measuring	Newly created clause
0 - Clause Removed	14.2.1	14.2.1 Swarf Removal	clause removed, subject is now discussed in 14.19.4.1 Preventing Swarf Damage.
4 - Clause Inserted	14.2.2	14.2.2 Ordering	Newly created clause.
2 - Editing and rearrangement	14.2.3	14.2.3 Transportation	Clause revised for clarity and moved to 14 Installation.
4 - Clause Inserted	14.3	14.3 Accepting Delivery	New created clause, combining Acceptance of Materials, previously in Site Practice.
4 - Clause Inserted	14.3.1	14.3.1 Unloading	Newly created clause
0 - Clause Removed	14.3.1	14.3.1 Primary Fasteners	Clause removed. Information is now discussed in various shorter and newly created clauses.
4 - Clause Inserted	14.3.2	14.3.2 Wet Storage Damage	Newly created clause
0	14.4	14.4 Secondary Fasteners	class="views-field views-field-field-revision-message-revision-id">
0 - Clause Removed	14.4.2	14.4.2 Monel Rivets	clause removed, information is now discussed in other clauses.
0 - Clause Removed	14.4.3	14.4.3 Aluminium Rivets	Clause removed, information now in 14.13.4 Rivets
0 - Clause Removed	14.4.4	14.4.4 Stainless Steel Rivets	Clause deleted. See 14.13.4 Rivets
0 - Clause Removed	14.4.6	14.4.6 Fastener Frequency	Clause removed. See 14.14.1 Fastener Spacing
2 - Editing and rearrangement	14.5	14.5 Handling	Clause revised for clarity and moved to Installation.
0 - Clause Removed	14.5.2	14.5.2 Pan Fixing	Clause Removed. See 14.13.2 Screws
0 - Clause Removed	14.5.3	14.5.3 Expansion Fixings	Clause removed. See 14.14.4 Fastener Allowance for Expansion
0 - Clause Removed	14.5.4	14.5.4 Lap Stitching	Clause removed. Information absorbed in other clauses.
2 - Editing and rearrangement	14.6	14.6 Walking On Roofs	Clause revised for clarity and moved to 14 Installation.
0 - Clause Removed	14.6	14.6 Installation	Empty heading removed. See 14.14 Fastener Installation.
4 - Clause Inserted	14.6.1	14.6.1 Footwear	Newly created clause
2 - Editing and rearrangement	14.7	14.7 Strippable Films	Clause revied for clarity.
0 - Clause Removed	14.7	14.7 Re-Roofing	Clause removed. Information absorbed in other clauses.
4 - Clause Inserted	14.7.1	14.7.1 Storing Product with Strippable Film	Newly created clause
2 - Editing and rearrangement	14.8	14.9 Setting Out	Clause revised for clarity.
0 - Clause Removed	14.8.2	14.8.2 Side Lap Fixing Between Purlins	Clause removed.
0 - Clause Removed	14.8.6	14.8.6 Purlin Protection	clause removed
0 - Clause Removed	14.8.7	14.8.7 Drainage	Clause removed
0 - Clause Removed	14.8.8	14.8.8 Condensation	Clause removed.
4 - Clause Inserted	14.9	14.10 Marking and Cutting	Newly created clause
2 - Editing and rearrangement	14.11	14.12 Sealing and Joining	Clause revised for clarity
4 - Clause Inserted	14.11.1	14.12.1 Sealing End Laps	Newly created clause
2 - Editing and rearrangement	14.12	14.13 Fasteners	Clause revised for clarity.
0	14.12.1	14.13.1 Nails	class="views-field views-field-field-revision-message-revision-id">
2 - Editing and rearrangement	14.12.2	14.13.2 Screws	Clause revised for clarity.
4 - Clause Inserted	14.12.3	14.13.3 Clip Fasteners	Newly created clause.
2 - Editing and rearrangement	14.12.4	14.13.4 Rivets	Clause revised for clarity
2 - Editing and rearrangement	14.13	14.14 Fastener Installation	Clause renamed and revised for clarity.
2 - Editing and rearrangement	14.13.1	14.14.1 Fastener Spacing	Newly created clause
4 - Clause Inserted	14.13.2	14.14.2 Fastener Placement	Newly created clause
4 - Clause Inserted	14.13.3	14.14.3 Fastener Seating	Newly created clause
4 - Clause Inserted	14.13.4	14.14.4 Fastener Allowance for Expansion	Newly created clause
4 - Clause Inserted	14.14	14.15 Modes Of Fastener Failure	Clause revised for clarity
4 - Clause Inserted	14.15	14.16 Stop-ends	Clause revised for clarity.
2 - Editing and rearrangement	14.16	14.17 Turndowns (Drip Forming or Drip Edging)	Clause revised for clarity.
4 - Clause Inserted	14.17	14.18 Soft edging and Flashing	Newly created clause
4 - Clause Inserted	14.18	14.19 Avoiding Problems	Newly created clause heading
2 - Editing and rearrangement	14.18.1	14.19.1 Roof Cladding Damage	Clause revised for clarity and moved to 14 Installation
4 - Clause Inserted	14.18.2	14.19.2 Water Ponding	Newly created clause
4 - Clause Inserted	14.18.3	14.19.3 Correctly Installed Gutters	Newly created clause
0	14.18.4	14.19.4 Swarf Damage	class="views-field views-field-field-revision-message-revision-id">
4 - Clause Inserted	14.18.4.1	14.18.4.1 Identifying Swarf Stains	Newly created clause
4 - Clause Inserted	14.18.4.2	14.19.4.1 Preventing Swarf Damage	Newly created clause
4 - Clause Inserted	14.18.4.3	14.18.4.3 Swarf Effect on Performance	Newly created clause.
2 - Editing and rearrangement	14.18.4.4	14.18.4.4 Repairing Swarf Damage	Clause revised for clarity and renamed.
4 - Clause Inserted	14.18.4.5	14.19.4.2 Severe or Extensive Swarf Staining	Newly created clause.
4 - Clause Inserted	14.18.5	14.19.5 Colour Matching Paint	Newly created clause
4 - Clause Inserted	14.18.6	14.19.6 Field Painting	Newly created clause.
4 - Clause Inserted	14.18.7	14.19.7 Sunscreen	Newly created clause.
4 - Clause Inserted	14.18.8	14.18.8 Removing Lichen	Newly created clause.
2 - Editing and rearrangement	14.21	14.22 Tools Of The Trade	Claused revised for clarity.
4 - Clause Inserted	14.21.1	14.22.1 Spacing	Clause removed. See 14.14.1 Fastener Spacing
4 - Clause Inserted	14.22.1	14.23.1 Crest Fixing	Clause removed. See 14.13.2 Screws
4 - Clause Inserted	14.23	14.6.2 Tools	Clause removed. See 14.13.2 Screws
4 - Clause Inserted	14.24	14.8 Translucent Sheeting	Clause removed.
4 - Clause Inserted	14.24.1	14.8.1 Side-Lap Fixing	Clause removed.
4 - Clause Inserted	14.24.2	14.8.3 End Laps	Clause deleted.
4 - Clause Inserted	14.24.3	14.8.4 Midspan Supports	Clause removed
4 - Clause Inserted	14.24.4	14.8.5 Stopends	Clause removed.
4 - Clause Inserted	14.24.5	14.8.9 Pitch	Clause removed.
2 - Editing and rearrangement	17	17 Testing	Edited for clarity.
2 - Editing and rearrangement	17.1	17.1 Scope	Clause revised for clarity
1 - Minor Errata	17.1.2	17.1.2 Resistance to point load	Fixed typos – "serviceability" and "strength".
2 - Editing and rearrangement	17.2	17.2 Background to Scope	Heading changed from "Commentary on 16.1" and clause revised for clarity and brevity.
4 - Clause Inserted	17.4	17.4 Commentary On 16.3	Clause removed
2 - Editing and rearrangement	17.5	17.5 Determining Wind load Span Graphs	Minor grammatical edits and clause renamed to "Determining Wind Load Span Graphs" to avoid confusion with 3.11.1 Steel Cladding Wind Load Span Graphs.
1 - Minor Errata	17.6	17.6 Specific Methods Of Testing Sheet Roof And Wall Cladding	Clause moved (renumbered) to follow 17.7 Wind and Point Load Testing.
4 - Clause Inserted	17.7.1	17.7.1 Commentary On Section 15.5	Clause Removed. 17 Testing to undergo major revision.
2 - Editing and rearrangement	17.9	17.9 Background to wind load testing	Renamed "Clause from Commentary on 16.6".

2019 – February

19.23 2019 – February

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), is effective 1 February 2019.

In this update, no recommendations have been altered that would require changes to existing projects in progress.

Summary of Changes in this Update

Two new clauses were added in 3 Structure to discuss 3.4.5 Material Grade and 3.4.6 Material Thickness.
Two new, separate, clauses under 4.15 Clearances, discuss 4.15.1 Ground Clearance and related 4.15.2 Site Management in more detail.
Clauses dealing with 3.12.1 Screw Fasteners fixing to specific purlin types re-ordered for clarity.
New drawing to show recommended 9.4A Recommended Penetration Type Positioning.
Other updates consist of Category 1 – minor errata corrections to spelling, and grammar and layout.

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	3.12.1	3.12.1 Screw Fasteners	Clauses dealing with fixing to specific purlin types re-ordered for clarity.
1 - Minor Errata	3.13.1	3.4.1 Corrugate Profile	Minor grammatical editing for clarity.
1 - Minor Errata	3.14.3	3.10.2 Maximum Spans and Fastening Pattern for Corrugate Wall Cladding	Heading says 0.40 mm but Table is .40 and .55. So remove .40 from heading
1 - Minor Errata	4.6.1	4.6.1 Assessment of Marine Environments	Removed full stop from the heading.
2 - Editing and rearrangement	4.8.1	4.8.4 Lichen	Resized photo (4.8.4A Lichen on a Metal Roof ) and inserted photo (4.8.4B Permanent Damage from Lichen Growth.
2 - Editing and rearrangement	4.15	4.14 Swarf Staining and Cut Edge Corrosion	Renamed clause. Resized photos and inserted new photo ( 4.14D Cut Edge Corrosion )
1 - Minor Errata	4.17.3	4.16.3 Aluminium	fixed spelling of "quaters" to quarters
1 - Minor Errata	4.18.1.3	4.18.1.3 Top Coat and Backer	0
1 - Minor Errata	5.3.1	5.3.1 Catchment Area	Removed (Optional Caption) from A Wind-effect on Rain
1 - Minor Errata	6.1.1	6.1.1 E2 Objective	Set format as Block Quote
1 - Minor Errata	6.1.2	6.1.2 E2 Functional Requirement	Format as block Quote.
1 - Minor Errata	6.3	6.3 Related Topics	Changed link "Internal Moisture" to "Roof Ventilation.
2 - Editing and rearrangement	9.5.6	9.4.2.5 Penetration Flashings on Corrugated Profiles	Revised and renamed clause.
1 - Minor Errata	14.5.1	14.23.1 Crest Fixing	Corrected minimum embedment into soft wood from 35mm to 30mm aligning with E2/AS1 and other reference in 3.8.3 Timber Purlins

2018 – November

19.24 2018 – November

The NZ Metal Roof and Wall Cladding Code Practice (COP), has been updated effective 1 November 2018.

In this Update no recommendations have been altered that would require changes to existing projects in progress

Summary of Changes in this Update

The previous External Moisture, Flashings and Penetrations sections have been updated to closer reflect the requirements of NZBC Clause E2 – External Moisture.
All clauses and sub-clauses in these sections have been substantially revised and drawings updated to show details more clearly.
- 6 External Moisture Overview gives a general introduction and overview of NZBC Clause E2 – External Moisture.
- 7 External Moisture Roofing discusses requirements for roof and wall cladding.
- 8 External Moisture Flashings deals with flashings, seals and laps.
- 9 External Moisture Penetrations recommends good practice for penetration design and installation.
Other updates consist of Category 1 – minor errata corrections to spelling, and grammar and layout.

19.24A

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	4.5.2	4.5.2 Sea Spray	Moved copy dealing with corrosion from "Eaves Flashing" to "Sea Spray".
1 - Minor Errata	4.11.8	4.10.8 Microcracking	Correction to comparative scale of illustrations
0 - Clause Removed	6.1.1	7.1.1 Conduction
4 - Clause Inserted	6.1.1	6.1.1 E2 Objective	E2 Objective under NZBC Clause E2 (Extract)
4 - Clause Inserted	6.1.2	6.1.2 E2 Functional Requirement	New clause to follow E2 Objective.
4 - Clause Inserted	6.1.3	6.1.3 E2 Performance Requirements	New clause to follow "Functional Requirement".
0 - Clause Removed	6.1	7.1 Heat	Clause removed, see 7.3 Thermal Expansion And Contraction.
4 - Clause Inserted	6.1	6.1 NZBC Clause E2 External Moisture (Extract)	New Clause under External Moisture — General.
4 - Clause Inserted	6.2.1	6.2 Compliance	New 2nd level clause to follow "Acceptable Solution NZBC E2/AS1"
0 - Clause Removed	6.2.2.1	7.4.2.1 Profile Strength	Subject now discussed in 7.3 Thermal Expansion And Contraction.
2 - Editing and rearrangement	6.2.2.3	8.10 Flashing Expansion Details	Completely revised clause.
2 - Editing and rearrangement	6.2.2.4	8.10.2 Building Expansion Joints	Clause duplicated.
4 - Clause Inserted	6.2	6.2 Acceptable Solution NZBC E2/AS1	New 2nd level clause to follow "Limits on Applications. "
0 - Clause Removed	6.3	8.15 Sealing Washers
4 - Clause Inserted	6.3	6.3 Related Topics	New 1st level heading under "External Moisture — General"
3 - Substantial change to recommendation	6.5.2	7.1.2 Runoff	Clause completely revised.
0 - Clause Removed	6.5.3	7.2.3 Snow	Clause removed, combined with 5.4 Snow.
0 - Clause Removed	6.5.4	7.2.4 Hail	Clause removed combined with 5.4.1 Hail.
2 - Editing and rearrangement	6	6 External Moisture Overview	Clause completely revised to reflect all four COP clauses dealing with E2 External Moisture.
3 - Substantial change to recommendation	7.1.1	7.1.1 Minimum Roof Cladding Pitch	Clause completely revised.
0 - Clause Removed	7.1	7.1 Radiation
0 - Clause Removed	7.1	8.1 Purpose	Clause removed, included in 8 External Moisture Flashings.
2 - Editing and rearrangement	7.2.1	8.1.1 Flashing Durability	Completely revised and renamed clause renamed (previously "compatibility").
0 - Clause Removed	7.2	7.2 Convection
2 - Editing and rearrangement	7.2	7.1 Roof Pitch	Clause completely revised. To be the first sub-clause under External Moisture — Cladding.
2 - Editing and rearrangement	7.2	8.1 Flashing Materials	Completely revised clause
4 - Clause Inserted	7.2	7.2 Fastening Roofing	New sub-clause to be inserted at the end of Roof Pitch under External Moisture — Cladding.
3 - Substantial change to recommendation	7.3.1	7.3.1 Temperature Range	Completely Revised and rewritten. To follow "Thermal Expansion and Contraction" under the new level 1 Clause: "Cladding"
4 - Clause Inserted	7.3.1	8.4.4 Flashing Laps	Completely revised and shortened clause.
3 - Substantial change to recommendation	7.3.2	7.3.2 Roof Cladding Expansion Provisions	Completely Revised and Rewritten. To follow "Steel Cladding Temperature Ranges" in "Thermal expansion and Contraction" under new Level 1 Clause: "Cladding".
2 - Editing and rearrangement	7.3	7.3 Thermal Expansion And Contraction	Completely revised and redone. To be moved under new level 1 Clause: External Moisture Cladding.
0 - Clause Removed	7.4.1.1	8.6.1.1 Ridge - Hip Intersections	Clause incorporated into 8.5.1 Ridge and Hip Intersections.
2 - Editing and rearrangement	7.4.2	8.5.3 Barge And Verge	Completely revised clause.
0 - Clause Removed	7.4.2.1	8.6.2.1 Internal Barge Flashing	Incorporated into parent clause.
2 - Editing and rearrangement	7.4.2.2	8.5.3.1 Ridge – barge Intersections	Completely revised clause.
2 - Editing and rearrangement	7.4.4	8.5.5 Apron Flashings	Completely revised clause
2 - Editing and rearrangement	7.4.4.1	8.5.5.1 Parapet And Apron Capping Terminations	Completely revised clause.
2 - Editing and rearrangement	7.4.4.3	8.5.5.3 Step Apron	Completely revised clause. Drawings updated.
2 - Editing and rearrangement	7.4.4.4	8.5.5.4 Eaves Flashing	Completely revised and renamed clause. (Previously "Gutter Apron"). Drawing updated.
0 - Clause Removed	7.4.5	8.6.5 Valley Flashings	Clause removed. Valleys are discussed in "Roof Drainage".
2 - Editing and rearrangement	7.4.6	8.5.6 Curved Flashings	Completely revised clause.
2 - Editing and rearrangement	7.4.6.1	8.5.6.1 Lockseamed Flashings	Revised clause. Information added.
0 - Clause Removed	7.4.6.2	8.6.6.2 Jennied Flashings	Clause removed — all references to "jennying" has been removed from "Flashings".
4 - Clause Inserted	7.4.6.3	8.5.6.2 Crimped Flashings	New clause under 8.5.6 Curved Flashings.
0 - Clause Removed	7.4.7	8.6.7 Soffit Flashings	Clause removed.
2 - Editing and rearrangement	7.4	7.4 End Laps	Clause completely revised.
2 - Editing and rearrangement	7.4	8.5 Flashing Types	The last line edited.
0 - Clause Removed	7.5.1	8.12.1 Unpainted Metal Cladding	Clause removed.
0 - Clause Removed	7.5.2	8.12.2 Ventilation and Cavities	Clause removed.
0 - Clause Removed	7.5.3	8.12.3 Window and Door Flashings in Metal Cladding
0 - Clause Removed	7.5.4	8.12.4 Horizontal Metal Cladding
0 - Clause Removed	7.5.5	8.12.5 General Principles
0 - Clause Removed	7.5.6	8.12.6 Flush Window Flashings	Clause removed.
0 - Clause Removed	7.5.7	8.12.7 Recessed Window Flashings	Clause removed.
0 - Clause Removed	7.5.8	8.12.8 Butt Window Flashings	Clause removed.
0 - Clause Removed	7.5.9	8.12.9 Flashings For Vertical Cladding
0 - Clause Removed	7.5.10	8.12.10 Alternative Flashing Designs
2 - Editing and rearrangement	7.5	8.11 Metal Wall Cladding Flashings	Completely revised and renamed clause.
0 - Clause Removed	7.6	8.13 Flashings For Vertical Cladding	Clause removed.
0 - Clause Removed	7.7	8.14 Flashings For Horizontal Corrugate Cladding	Clause Removed.
2 - Editing and rearrangement	7.8.1	8.6.1 Primary Fasteners	Completely revised and shortened clause.
2 - Editing and rearrangement	7.8.2	8.6.2 Secondary Fasteners	Completely revised clause.
0 - Clause Removed	7.8.3	8.7.3 Secret Fixing Clips	Clause deleted.
2 - Editing and rearrangement	7.8.4	8.6.3 Flashing Cleats
4 - Clause Inserted	7.8.5	8.6.4 Seams	Split the drawing into eight individual drawings, for improved layout.
2 - Editing and rearrangement	7.8	8.6 Fastening Flashings	Clause renamed.
0 - Clause Removed	7.9.1	8.8.1 Properties	Clause removed. Discussed in 8.7 Sealants.
2 - Editing and rearrangement	7.9.2	8.7.1 Methods Of Sealing	Revised clause
2 - Editing and rearrangement	7.9.3	8.7.2 Surface Preparation	Clause shortened.
0 - Clause Removed	7.9.5	8.8.5 Sealed Laps	Clause removed see: A Sealed End Lap.
0 - Clause Removed	7.9.6	8.8.6 Strip Sealants	Clause removed.
0 - Clause Removed	7.9.7	8.8.7 Soldered Joints	Clause Removed.
2 - Editing and rearrangement	7.9	8.7 Sealants	Completely revised clause.
0 - Clause Removed	7.10.1	8.9.1 Vented Fillers
2 - Editing and rearrangement	7.10.2	8.8.1 Soft Edging	Revised and renamed clause.
2 - Editing and rearrangement	7	8 External Moisture Flashings	Completely revised clause.
4 - Clause Inserted	7	7 External Moisture Roofing	New Level 1 clause.
0 - Clause Removed	8.1	9.1 General	Clause removed. General discussion incorporated in the introduction.
2 - Editing and rearrangement	8.2.1	9.2 Additional Support	Completely revised and renamed clause.
2 - Editing and rearrangement	8.2.2	9.3 Penetration Durability and Compatibility	Completely revised and renamed clause.
0 - Clause Removed	8.2.3	9.5 Corrosion	Incorporated into "9.3 Penetration Durability and Compatibility".
0 - Clause Removed	8.2.4	9.5.1 Catchment	Clause removed.
0 - Clause Removed	8.2.5	9.5.2 Obstruction	Clause removed.
0 - Clause Removed	8.2.6	9.5.3 Discharge Capacity	Clause removed, see
0 - Clause Removed	8.2.7	9.5.4 Sealing	Clause removed. (Information is repeated in 8 External Moisture Flashings)
0 - Clause Removed	8.2.8	9.5.5 Alternative Materials	Clause removed, see 8.8.1 Soft Edging.
2 - Editing and rearrangement	8.2	8.2 Flashing Design	Completely revised and shortened clause
2 - Editing and rearrangement	8.2	9.1 Penetrations Minimum Pitch	Completely revised and renamed clause.
0 - Clause Removed	8.3.1	9.7.6 Nomenclature	Clause removed. More details added in 9.4 Penetration Design.
0 - Clause Removed	8.3.2	9.7.7 Diverter Or Cricket Designs	Clause removed in favour of more detailed drawings in Penetration Flashing Design.
0 - Clause Removed	8.3.3	9.7.8 Penetration Flashing Installation	Clause removed in favour of more detailed drawings in "Penetration Flashing Design".
0 - Clause Removed	8.3.4	9.7.9 Laps	Clause removed, see 7.4 End Laps.
0 - Clause Removed	8.3.5	9.7.10 Details	Clause removed. See 9.4.2.5 Penetration Flashings on Corrugated Profiles.
0 - Clause Removed	8.3.7	9.7.11 Type A Soaker
0 - Clause Removed	8.3.8	9.7.12 Type B Watershed	Clause removed. New Details available.
0 - Clause Removed	8.3.9	9.7.13 Type C Tapered	Clause removed. New flashing details provided.
0 - Clause Removed	8.3.10	9.7.14 Type D Tray	Clause removed. New Flashing details provided elsewhere.
2 - Editing and rearrangement	8.3	8.4 Flashing Cover	Completely revised clause. Drawings updated for clarity.
2 - Editing and rearrangement	8.3	9.4 Penetration Design	Revised clause.
2 - Editing and rearrangement	8.4.1	9.5.2.1 Plant Room And Conduit Penetrations	Completely revised clause.
2 - Editing and rearrangement	8.4	8.2.1 Flashing Edges	Completely revised clause. Drawings updated.
2 - Editing and rearrangement	8.5.1	8.5.1 Ridge and Hip Intersections	Completely revised clause.
2 - Editing and rearrangement	8.5.3	8.5.4 Parapet Cappings	Completely revised clause.
3 - Substantial change to recommendation	8.5.4.2	8.5.5.2 Change Of Pitch	Completely revised clause. Drawings updated.
0 - Clause Removed	8.5	9.9 Dormer Junctions	Clause removed.
4 - Clause Inserted	8.7.3	8.7.3 Sealant Extrusion And Placement	Updated drawing: "Applying Sealant".
4 - Clause Inserted	8.8.2	8.8.2 Notched Edging	New Clause to follow "Soft Edging", under "Profile Closures".
2 - Editing and rearrangement	8.8	8.8 Profile Closures	Completely revised clause.
4 - Clause Inserted	8.9	8.9 Compression Timber	Inserted new clause.
4 - Clause Inserted	8.32	19.24 2018 – November	November Update Message added
2 - Editing and rearrangement	8	9 External Moisture Penetrations	Completely revised and renamed clause.
4 - Clause Inserted	9.3	9.2.1 Penetrations Safety	New sub-clause under "Additional Support".
4 - Clause Inserted	9.5.1	9.4 Penetration Positioning	New Clause.
4 - Clause Inserted	9.5.2	9.4.1 Penetration Back Flashings	New Clause.
4 - Clause Inserted	9.5.3	9.4.1.1 Over-Flashed (Watershed) Back Flashings	New Clause
4 - Clause Inserted	9.5.4	9.4.1.2 Under-Soaker Back Flashings	New Clause
4 - Clause Inserted	9.5.5	9.4.2 Curb Design	New Level 2 Clause.
4 - Clause Inserted	9.5.5.1	9.4.2.1 Level Back Curbs	New level 3 Clause under 9.4.2 Curb Design.
4 - Clause Inserted	9.5.5.2	9.4.2.2 Arrowhead Back Curbs	New 3rd level clause under 9.4.2 Curb Design.
4 - Clause Inserted	9.5.5.3	9.4.2.3 Cricket Back Curbs	New level 3 Clause under 9.4.2 Curb Design.
2 - Editing and rearrangement	9.5.6	9.4.2.5 Penetration Flashings on Corrugated Profiles	Revised and renamed clause.
4 - Clause Inserted	9.6.1	9.5.1 Boot Flashings to an Over Flashing	New Clause
4 - Clause Inserted	9.6.2	9.5.2 Other Applications for Boot Flashings	New Clause
4 - Clause Inserted	9.6.2.2	9.5.2.2 Mechanical Services	New clause
2 - Editing and rearrangement	9.6	9.5 Boot Flashings	Revised and renamed clause.
4 - Clause Inserted	9.7	9.5.3 Flush Penetrations	New clause
2 - Editing and rearrangement	16.7	17.7 Wind and Point Load Testing

2018 – October

19.25 2018 – October

The NZ Metal Roof and Wall Cladding Code Practice (COP), has been updated effective 1 October 2018.

Summary of Changes in this Update

In this update there are Category 1 - Minor Errata corrections only, for spelling and grammar - no clauses have been substantially revised, nor any recommendations altered.

19.25A Revision Detail - 2018 - October

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
1 - Minor Errata	1.5.1	1.5.1 Mediation	1. Inserted "a" before settlement. 2.Corrected spelling of "available" in the second paragraph.
1 - Minor Errata	2.1	2.1 Definitions	General tidy up; Fix spelling: Intersection, surface, heights, dewpoint, six-sided, practitioners, seashore, rainwater, coatings, trademark, components, electromagnetic, skylight, sawtooth, embedded, cross-section, violently, stop end, fibreglass, change. Changed: Low Pitched 15° to 10°, and Pitch Roof 15° to 10°. Remove some extra spaces. Removed some commas. Inserted comma. Changed "newton" to "Newton". Reworked Pop Rivet definition. Removed semi-colon. UPdated "boot Flashings.
1 - Minor Errata	3.5.6	3.5.6 Section Properties	Moved paragraph: "Symmetrical corrugate or trapezoidal profiles have the advantage of being more easily curved around a radius. Because the ribs are necessarily close together, they have the disadvantage of roof traffic loads having to be spread over two crests or along the purlin line, and they have a lower run-off capacity."
1 - Minor Errata	3.5.8	3.5.1.1 Continuity	Updated Drawing. Arrows were not displaying correctly.
1 - Minor Errata	3.6.1	3.6.1 Point Load	Removed empty paragraph spacing
1 - Minor Errata	4.9.3	4.8.3 Graffiti Removal	Fixed typo "Grafitti"
1 - Minor Errata	4.10.3	4.9.4 Compatibility Table	Inserted "online" in the description of the online interactive tool.
1 - Minor Errata	4.11.6	4.10.6 Capillary Action	Typo — Changed 80 to 8°.
1 - Minor Errata	4.11.8	4.10.8 Microcracking	Replaced drawings a through to e
1 - Minor Errata	5.7	5.7 Downpipes	Replaced drawing "Collecting Rainwater"
1 - Minor Errata	6	6 External Moisture Overview	Fixed typo: "conductionand" to "conduction and"
1 - Minor Errata	9.3.3	10.12.1 Cold Roofs	fixed typo: inserted " is ..."
1 - Minor Errata	9.5	10.11 Underlay	1. Added new new photo – 9.5C Condensation on Synthetic Underlay. 2. Typo: corrected spelling of 9.5B "Condesation.." to "Condensation"
1 - Minor Errata	9.5.5	10.7.5 Non-Residential Buildings	Fixed typo: deleted extra "in"
1 - Minor Errata	10	11 Natural Light	Fixed typos: "thermal", "installation" and "available"
1 - Minor Errata	10.1	11.1 Clause G7 NZBC	Fixed typos: "through", "enough"
1 - Minor Errata	10.2	11.2 Natural Light Materials	Fixed typos: "a varying mass" and "square"
1 - Minor Errata	10.3	11.3 Types Of Roof Lights	Fixed typos: "single" and removed extra space after comma.
1 - Minor Errata	10.5	11.5 Weathering And Durability	Fixed typo: "not"
1 - Minor Errata	13.1.2	14.17 Turndowns (Drip Forming or Drip Edging)	changed "downturns" to "Turn-downs" and inserted "drip forming or drip edging" in the heading.
1 - Minor Errata	13.3.3	14.13.2 Screws	1. Fixed typos: "hardwoods", 2. Fixed broken links" "Fastener Performance" and "Secret Fixing Clips"
1 - Minor Errata	13.5.3	14.5.3 Expansion Fixings	Fixed link: "favourable conditions for expansion"
1 - Minor Errata	14.1.5	15.1.5 Purlin Spacing	Fixed typo: "subjected", removed comma.
1 - Minor Errata	14.4.2.4	15.4.2.4 Types Of Joints	Removed unnecessary link: (See drawing 11.2.4)
1 - Minor Errata	16.1.3	17.1.3 Resistance for wind pressures	Replaced incorrect numbering reference (section 15.7) with correct link (Wind and Point Load Testing)
1 - Minor Errata	16.2	17.2 Background to Scope	Corrected heading "Commentary on 16.1"
1 - Minor Errata	16.4	17.4 Commentary On 16.3	Corrected heading: "Commentary On 16.3"
1 - Minor Errata	16.9	17.9 Background to wind load testing	Corrected heading: "Commentary On Section 16.6"