Construction codes of Ontario

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Trimmer Joists

Trimmer Joists (1) Trimmer joists around floor openings shall be doubled when the length of the header joist exceeds 800 mm. (2) When the header joist exceeds 2 m in length, the size of the trimmer joists shall be determined by calculations. Article 9.23.9.6. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes […]

Types and installation of sheating

Types and installation of sheating OSB is a structural panel made from wood strands that are bonded together under heat and pressure with a waterproof, phenolic adhesive. The strands in the outer faces are oriented along the longitudinal axis of the panel, giving added strength and rigidity in the long direction. The panels are manufactured […]

Typical dormer framing

Typical dormer framing Dormers are framed so that the rafters at each side are doubled to support the side studs and valley rafters. The top ends of the valley rafters are supported by a header spanning between the doubled rafters (Figure 88). The most common method of construction is to install the roof sheathing before […]

Undersized Lumber

(1) Joist, rafter, lintel and beam members up to 5% less than the actual Canadian standard sizes are permitted to be used provided the allowable spans for the grade and species of lumber under consideration are reduced 5% from those shown in the span tables for full size members. Article 9.3.2.8 Ontario Regulation 332/12 Building Code, […]

Wall Framing

Wall Framing Wood panel wall sheathing provides significant resistance to lateral loads from high winds and earthquakes. In areas with a risk of high winds and earthquake loads, thicker sheathing, closer nailing patterns and the provision of “braced panels” may be required to strengthen walls.Select appropriate sheathing thickness and nailing patterns to provide adequate resistance […]

Wall sheathing description

Wall sheathing description Wall sheathing is the outside covering used over the wall framework. It is nailed directly to the wall framing members and provides a nailing base for some types of siding and backing for others. Certain wall sheathing materials such as plywood and OSB are very effective in providing lateral bracing. Insulating sheathing […]

Wall Sheathing Thickness and Specifications Table

Wall Sheathing Thickness and Specifications Table Table 9.23.16.2.A.Wall Sheathing Thickness and Specifications Forming Part of Sentence 9.23.16.2.(1) Notes to Table 9.23.16.2.A.: (1) See also Sentences 9.27.5.1.(2) and (3). (2) The flame-spread rating of gypsum board shall be determined in accordance with CAN/ULC-S102, “Test for Surface Burning Characteristics of Building Materials and Assemblies”. Table 9.23.16.2A Ontario Regulation 332/12 […]