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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:

  • Curved Roofs and all its sub-clauses have been substantially reviewed and revised.
  • 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:

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

Revision Detail v23.12 - 2023 - December

CategoryClause Number (prior to update)Clause (As of current publication)Details
2 - Editing and rearrangement3.9.3Maximum Spans and Fastening Pattern for Corrugate Wall Cladding This clause has been renamed and moved to Fastening Pattern Tables – Designs to NZS 3604.
1 - Minor Errata3.10.1G550 Steel Roof Fastening Pattern Tables Clause has been renamed to clearly differentiate between roof and wall cladding fastening patterns.
3 - Substantial change to recommendation15.1Curved Roofs The main clause 15.1 Curved roof has been comprehensively reviewed and revised.
3 - Substantial change to recommendation15.1.1Spring Curving This clause has been substantially revised during the overall review of Curved Roofs.
0 - Clause Removed15.1.3Transverse LapsThis clause has been removed during the revision of Curved Roofs. Information previously contained in this clause is now available in other sub-clauses of the main clause (Curved Roofs).
4 - Clause Inserted Penetrations: Curved Roofs A newly created clause as part of the overall revision of Curved Roofs
4 - Clause Inserted Ventilation: Curved Roofs A newly created clause as part of the overall revision of Curved Roofs.
2 - Editing and rearrangement9External Moisture Penetrations New referral to RANZ Roofing Guide for further information.
4 - Clause Inserted Thermal Expansion: Curved Roofs A newly created clause as part of the overall revision of Curved Roofs.
4 - Clause Inserted Installation: Curved Roofs New clause, created from information previously contained in Crimp Curving.
0 - Clause Removed15.1.6Concave RoofsThis clause has been removed during the revision of Curved Roofs.
0 - Clause Removed15.1.10Timber FixingThis clause has been removed during the revision of Curved Roofs.
2 - Editing and rearrangement15.1.4Durability This clause has been edited during the overall revision of Curved Roofs.
0 - Clause Removed15.1.5Purlin SpacingThis clause has been removed during the overall revision of Curved Roofs. The information can now be found in Spring Curving.
2 - Editing and rearrangement15.1.7Pre-Curved Roofs This clause has been revised as part of the overall revision of Curved Roofs.
2 - Editing and rearrangement15.1.9Crimp Curving

This clause has been substantially edited during the revision of Curved Roofs.

2 - Editing and rearrangement15.1.8Roll Curving This clause has been revised during the overall revision of Curved Roofs.
4 - Clause Inserted End Laps: Curved Roofs Newly created clause as part of the overall revision of Curved Roofs.
2 - Editing and rearrangement9.4Penetration Design New referral to RANZ Roofing Guide for further information.
2 - Editing and rearrangement5.4.7Gutter Capacity Calculator Additional label to clarify that gutter dimensions at the outlet are to be used for the calculation.
2 - Editing and rearrangement8External Moisture Flashings New referral to RANZ Roofing Guide for further information.
2 - Editing and rearrangement8.2Flashing Design New referral to RANZ Roofing Guide for further information.
2 - Editing and rearrangement1, 1Introduction Updated Revisions Message
3 - Substantial change to recommendation15.1.2Side Laps: Curved Roofs This clause has been comprehensively revised during the overall review of Curved Roofs.
4 - Clause Inserted 2023 – December Revision details for V23.12; published on 1 December 2023.
2 - Editing and rearrangement8.5.2.1Ridge – barge Intersections New illustration showing a head barge/ridge/barge junction.
3 - Substantial change to recommendation8.4Flashing 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 up to 68 m/s, all pitches, and updated tables and the illustrations to match.  
4 - Clause Inserted Head Barge/Ridge/Barge Junction New iIllustration of Head Barge/Ridge/Barge Junction.
2 - Editing and rearrangement8.4.1Apron Upstands Inserted an illustration to show Undertray for additional upstand.
2 - Editing and rearrangement14.3.2Wet Storage Damage Added description and recommendation for dealing with Blooming.
1 - Minor Errata14.13.2Screws Fixed table: Screw Thread Types.
0 - Clause Removed16.2.1InstallationClause removed because the subject is comprehensively covered in Installation.
2 - Editing and rearrangement15.4.3Tray Roofing Design This clause has been renamed Tray Roofing Design. Some content editing for clarity.
2 - Editing and rearrangement15.4.12.1Tray Cladding Set Out The clause has been renamed Tray Cladding Set Out and a grammar fix.
4 - Clause Inserted10.1.4Compliance New Clause under NZBC Clause E3 Internal Moisture.
2 - Editing and rearrangement15.4.6Sarking Changed recommendation for overhang at the gutter line.
2 - Editing and rearrangement15.4.4Tray Fixings Content editing for clarity.
2 - Editing and rearrangement15.4.2Tray Roofing Profiles This clause has been renamed Tray Roofing Profiles. Some content editing.
2 - Editing and rearrangement15.4.1Tray Roofing Materials Renamed the clause to Tray Roofing Materials. Some minor edits.
3 - Substantial change to recommendation15.4Tray 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 rearrangement9.4.2.6Penetration Flashings on Trapezoidal Profiles Renamed clause to Penetration Flashings on Trapezoidal Profiles.
4 - Clause Inserted Tray Roofing Weathertightness A new clause dealing with Weathertightness and tray roofing.
4 - Clause Inserted Tray Roofing Clip Durability A new clause about the durability of roofing clips.
2 - Editing and rearrangement9.4.1Penetration Back Flashings Clause renamed to Penetration Back Flashings.
2 - Editing and rearrangement9.4.2.5Penetration Flashings on Corrugated Profiles Renamed the clause to Penetration Flashings on Corrugated Profiles.
1 - Minor Errata4, 4Durability Inserted a link to the Interactive Material Compatibility Tool.
1 - Minor Errata14.20.2Recommendations for Fixing Aluminium Added "non-compressible" to point d.
1 - Minor Errata15.4.8.1Tray Roofing Wind Noise Grammar fix.
1 - Minor Errata3.4.6Material Thickness Punctuation fix.
1 - Minor Errata3.4.1Corrugate Profile Grammar fix.
1 - Minor Errata3.4Profiles Typo fix.
1 - Minor Errata3Structure Punctuation fix.
(optional caption)
Clause: 
019_004_000_000_000_000_000_000_000
Clause Number: 
19.4
/cop/revision-history/v2312-december-2023
Revision Category: 
4 - Clause Inserted
Revision Detail: 

Revision details for v23.12; published on 1 December 2023.