Fasteners
Screws, Weatherproof seals and Sealant.
Roofing sheets are crest fixed, but walls can be valley fixed. It is important to use only 26mm Ampelite grey domed seals, that are chemically compatible with polycarbonate. If sealing is required at side and end laps, or screw seals, use a co-polymer sealant specifically formulated to be compatible with polycarbonate. Incompatible sealants weaken the sheeting and their use voids Warranty.
Drilling screw holes
To allow for the expansion and contraction of sheets, holes must be drilled oversize. Screw holes must have a minimum diameter of 10mm for sheet lengths up to 4.2m. Lengths over 4.2m and up to 6.0m require 12mm diameter holes. To fix Corrugated and Greca profiles use 50mm x 10g screws and for the V-Rib profile use 65mm x 12g screws.
Clearfix drilling screw
An alternative method of fixing which also speeds up installation, is to use self drilling combination drill/cutter and weather-proof seal assemblies. These fasteners self drill the sheet and create the correct clearance hole in one operation. A very easy, effective method.
Flashings
Maximum recommended curves
