Fasteners
Zinc or Aluminium
Nails: stainless steel or hot dipped galvanised enhanced shank nails 25 mm long.
Screws: stainless steel or hot dipped galvanised countersunk 25 mm long x 8#.
Copper
Nails: copper or stainless steel 25 mm long x 2.6 mm barbed shank flatheads.
Screws: Stainless steel countersunk 25 mm long x 8#.
Standing seams up to 3 m long may be secured entirely with fixed clips, but for longer lengths than 3 m, expansion clips should be located above or below the fixed clips to allow for longitudinal movement of the panels.
Fixed clips should be positioned at centres dependent on the design wind load. See Load/Clip Spacing.
The position of the fixed clips depends on the roof pitch. On a pitch of more than 30°, the clips should be placed at the top of the slope.
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