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Expansion Fixings

A limited amount of movement between the fastener and the cladding can be provided with an oversized hole for the fastener. When a greater amount of expansion is required, sliding fixings are necessary to allow for expansion and contraction. (See Favourable conditions for expansion)

There are two main types of sliding fixings.

  • Sliding Washers
  • Sliding Roofs

 

Sliding Washers

Sliding washers are used where the sheet and the fastener are separated by a material with a low friction coefficient, such as Teflon, enabling them to move independently in elongated holes. N.B. The seal should be made between the roof cladding and the washer by placing the sliding face (Teflon) upwards and the sealing face down onto the cladding.

Where an oversized or elongated hole is used, the sealing washer must be wide enough to seal the hole.
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Sliding Roof

Sliding Roof is where a clip is securely fastened to the structure, and a longitudinal groove cladding profile provides clearance for expansion and contraction.
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Clause: 
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Clause Number: 
14.5.3
/cop/installation/fixing#expansion-fixings
Revision Category: 
0 - Clause Removed
Revision Detail: 

Clause removed. See Fastener Allowance for Expansion

Draft Clause: 
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