Iron roofing sheets

Roofing sheets of corrugated iron shall be secured with stout galvanized roofing screws minimum size 1¾ x ¼ in. in diameter, with galvanized iron or lead washers or with stout galvanized roofing nails with washers. If batten purlins or roof boarding is used the roofing nails shall be of sufficient length to be properly clinched. The minimum gauge or corrugated iron roofing shall be No. 26. Kitchen and Fireplaces