Sheet Metal Roofing

Sheet metal roofing is manufactured in 30 to 36 in. (762 mm to 914 mm) widths, depending on the profile of the corrugation, and in any lengths specified by the builder. It comes with the necessary accessories for treating the various details of the roof, such as hips, valleys, eave starters and edges (Fig. 77). The usual method of fastening the metal roof sheets is to lay 1 x 4 in. (19 x 89 mm) wood nailing strips across the rafters at no more than 16 in. (400 mm) on centre. For more positive attachment and better nailing, 2x4 in. (38 x 89 mm) purlins can be used. There must be a nailing strip underneath each end joint (Fig. 77). The choice of metal thickness, be it steel or aluminum, will depend on the local snow load, but it should not be less than 0.013 in- (o-33 m) for galvanized steel, 0.018 in. (0.46 mm) for copper or zinc and 0.019 in. (0.48 mm) for aluminum. The required thicknesses for specific snow loads are given in tables provided by the manufacturer.

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