Lead Sheet Cladding

For cladding, the thickness of lead to be used dictates the maximum spacing between vertical joints and the

Fig. 5.25 Traditional lead roof. Contractor: Norfolk Sheet Lead. Photograph: Courtesy of Lead Contractors Association

distance between laps. Vertical joints may be wood-cored rolls or welts and occasionally standing seams or hollow rolls, where the risk of physical damage from ladders is negligible. The lead is hung by nailing at the head, with allowance for up to 6 mm thermal movement to occur within the lap joints.

An alternative form of lead cladding is the use of preformed lead-faced cladding panels, which are then fixed to the building facade (Fig. 5.26). Typically, 25 mm exterior-grade plywood covered with 1.80 or 2.24 mm (Code 4 or Code 5) lead is used. The panels are set against a lead-faced timber structural support leaving 25-mm-joints for thermal movement. Standard details are illustrated in the relevant Code of Practice BS 6915:2001.

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