9.23.15.2.Material Standards

(1) Except as provided in Sentence (2), wood-based panels for subfloors shall conform to (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.” (2) Particleboard subflooring may be used only where a building is constructed in a factory so that the subfloor will not be exposed to the weather. (3) Subflooring described in Sentence (2) shall conform to grade D-2 or D-3 in ANSI A208.1, “Particleboard.” (4) Subflooring described in Sentence (2) shall have its upper surface and all edges treated to restrict water absorption where the subfloor is used in bathrooms, kitchens, laundry rooms or other areas subject to periodic wetting. (See Note A- 9.23.15.2.(4))