Construction codes of Ontario

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Stud Wall Reinforcement

Stud Wall Reinforcement (1) If wood wall studs or sheet steel wall studs enclose the main bathroom in a dwelling unit, reinforcement shall be installed to permit the future installation of the following: (a) for a water closet, a grab bar described in Clauses 3.8.3.8.(3)(a) and a grab bar described in Clause 3.8.3.8.(3)(c), (b) […]

Studs at Sides of Openings

Studs at Sides of Openings (1) Except as provided in Sentence (2), studs shall be doubled on each side of openings so that the inner studs extend from the lintel to the bottom wall plate and the outer studs extend from the top wall plates to the bottom wall plate. (2) Single studs are permitted to […]

Subfloor

Subfloor Plywood, OSB or tongue-and-grooved lumber no wider than 184 mm (8 in. nominal) is typically used for subflooring. Minimum thicknesses for subflooring are shown in Table 22. Plywood and OSB are often used as subflooring under wood-strip flooring or as a combination subfloor and underlay for resilient flooring or ceramic tile. When used as […]

Subfloor Thickness or Rating

Subfloor Thickness or Rating (1) Except as provided in Sentences (2) and (3), subfloors shall conform to Table 9.23.14.5.A. or 9.23.14.5.B. (2) Where the finished flooring consists of not less than 19 mm matched wood strip flooring laid at right angles to joists, spaced not more than 610 mm o.c., subflooring shall be permitted to consist of […]

Subflooring Direction of Installation

Subflooring Direction of Installation (1) Plywood subflooring shall be installed with the surface grain at right angles to the joists and with joints parallel to floor joists staggered. (2) OSB subflooring conforming to CSA O325, “Construction Sheathing”, or to O-1 and O-2 grades in CSA O437.0, “OSB and Waferboard”, and waferboard subflooring conforming to R-1 grade in […]

Subflooring Edge Support

Subflooring Edge Support (1) Where the edges of panel-type subflooring are required to be supported, such support shall consist of tongue-and-groove panel edges or not less than 38 mm by 38 mm blocking securely nailed between framing members. Article 9.23.14.3. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Subflooring Material Standards

Subflooring 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 […]