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Side Lap Fixing Between Purlins

When side lap fixing GRP to metal, an oversize hole should be pre-drilled in the GRP and a coarse thread Type 17 screw used with a profile metal washer and EPDM seal.

 

GRP to Metal

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The side-lap fixing between purlins of GRP sheeting and the adjacent sheet must be fixed at maximum 600 mm centres through the top of the rib, with oversize holes in the GRP and load spreading and sealing washers.

When fixing GRP to GRP, a rubber-nut or grommet can be used and installed from the top side of the roof sheet using a 35 mm long, 4.5 mm diameter, aluminium or stainless steel gutter bolt and a 20 mm diameter metal and EPDM sealing washer.

GRP to GRP

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Alternatively, if Bulb-Tite rivets are used a clearance hole is required, and care should be exercised when setting the rivet to avoid stress at the connection. This fixing is not suitable for use in high design wind load areas.

Underlay or foil must be terminated at the lap to provide continuity for any condensation that may occur.

Underlay End — GRP

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When fixing tray decking profiles and using matching roof lighting sheets, there are several fixing options depending on the configuration of the profile. The independence of the metal and plastic sheeting should be maintained with all profiles to allow for their differing rates of expansion.

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