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Mechanical Fastening Panels can be fixed to supporting structures using screws, rivets or nails. Screws are most suitable as they are most controllable: tightening a screw and then backing it off slightly allows the panel to move with temperature changes without deformation. Nails and rivets can be used with small panels or in internal applications where there is little thermal movement since temperature differentials are small. In all cases holes must be predrilled oversize through the panel to accommodate thermal movement. This in turn necessitates the use of an oversize washer on the fastener to provide adequate retention of the sheet and spread the load. Countersunk screws must never be used without a recessed washer.(For hole,or slot and washer size for given sheet dimensions and fixing shank diameters see below.)
W = Washer Diameter
Holes or slots in a panel to accommodate fasteners should always be at least 25mm from the panel edge.
Fasteners should be spaced at the separations given for each thickness of panel.
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