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End Laps

The minimum end lap of GRP sheets with metal or GRP profile sheeting must be 200 mm. These laps must be sealed, and the bottom end of the overlapped sheet must be within 50 mm of the lower side of the purlin or saddle flashing.
Two lines of sealing beads or compressible strips must be placed, one within 15 mm from the bottom of the top sheet and the other 15 mm from the top of the bottom sheet.
Only compatible sealants must be used with plastic sheeting.

Silicone sealants should not be used with polycarbonate roof lighting.

The sealant materials for end laps of plastic sheeting should be neutral cure silicone, EPDM closed cell foam with self-adhesive on one face 25mm x 3 - 5mm thick, or polythene butyl tape.

 

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