Double locked standing seams are formed by locking the sides of adjoining panels by double welting the top of the upstand of the seam (which should be a minimum of 23mm).
The double-locked standing seam should be a minimum of 23mm when completed. A distance equivalent to 25% of the seam height should be allowed between the upstands of adjoining panels to allow for thermal movement.
The double locked welt at the top of the standing seam should be turned away from the prevailing weather where possible. In exposed areas or minimal slop the height of the standing seam can be increased and / or a suitable foam-backed or oil-based sealant can be inserted within the double lock welt.
Panels are secured to the roof substrate by inserting fixed and sliding clips within the standing seam.
Angled standing seams are formed in a similar manner except for the final fold which is turned parallel to the cladding surface. Angled standing seams are used for vertical cladding where a more definitive visual line is required. They are not recommended for slopes below 80⁰.
The angled standing seam must be a minimum of 25mm high when finished. A gap equivalent to 25% of the height of the seam should be allowed between upstands of adjoining panels to allow for thermal movement. The height of the standing seam may be increased to a maximum of 38mm in extreme positions. Panels should be secured to the roof substrate by inserting fixed and sliding clips within the standing seam.
The welt at the top of the angled standing seam should be turned away from the prevailing weather if possible.
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