Roof flashing materials (1)  Sheet metal flashing shall consist of not less than,     (a)   1.73 mm thick sheet lead,     (b)   0.33 mm thick galvanized steel,     (c)   0.33 mm thick copper,     (d)   0.35 mm thick zinc, or     (e)   0.48 mm thick aluminum. Article 9.26.4.2. Ontario Regulation 332/12 Building Code,   Information published […]

Roof Sheathing Direction of Installation (1)  Plywood roof sheathing shall be installed with the surface grain at right angles to the roof framing. (2)  OSB roof sheathing conforming to CSA O325, “Construction Sheathing”, or to O-1 and O-2 grades as specified in CSA O437.0, “OSB and Waferboard”, shall be installed with the direction of face orientation at […]

Roof Sheathing Material Standards (1)  Wood-based panels used for roof sheathing shall conform to the requirements of,     (a)   CSA O121, “Douglas Fir Plywood”,     (b)   CSA O151, “Canadian Softwood Plywood”,     (c)   CSA O153, “Poplar Plywood”,     (d)   CSA O325, “Construction Sheathing”, or     (e)   CSA O437.0, “OSB and Waferboard”. Article 9.23.15.2. Ontario Regulation 332/12 […]

Roof Sheathing Thickness or Rating (1)  The thickness or rating of roof sheathing on a flat roof used as a walking deck shall conform to either Table 9.23.14.5.A. or Table 9.23.14.5.B. for subfloors. (2)  The thickness or rating of roof sheathing on a roof not used as a walking deck shall conform to either Table 9.23.15.7.A. or […]