Hardboard Panels as exterior cladding

Hardboard is also produced in sheets with a variety of finishes and may be applied over sheathing or to unsheathed walls if a rainscreen is not required. The minimum thickness of sheets should be at least 6 mm (1⁄4 in.) for supports that are not more than 400 mm (16 in.) on centre. Fasten the panels to framing members or sheathing with corrosion-resistant nails at least 51 mm (2 in.) long spaced not more than 150 mm (6 in.) along the edges and 300 mm (12 in.) along intermediate supports. Provide a 2 to 3 mm (1⁄8 in.) gap between panels.

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