Construction codes of Ontario

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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, […]

Valley Flashing

Valley Flashing (1) Where sloping surfaces of shingled roofs intersect to form a valley, the valley shall be flashed. (2) Valley flashing shall be installed over continuous sheathing. (3) Closed valleys shall not be used with rigid shingles on slopes of less than 1 in 1.2. (4) Closed valley flashing shall consist of sheet metal, self sealing composite membranes […]

Vent Pipe Flashing

Vent Pipe Flashing (1) Flashing fabricated on site for vent pipes shall be fabricated from, (a) copper sheet at least 0.33 mm thick, (b) aluminum sheet at least 0.48 mm thick, (c) alloyed zinc sheet at least 0.35 mm thick, (d) lead sheet at least 1.73 mm thick, (e) galvanized steel […]

Vent Requirements

Vent Requirements (1) Except as provided in Sentence (2), the unobstructed vent area shall be not less than 1/300 of the insulated ceiling area. (2) Where the roof slope is less than 1 in 6 or in roofs that are constructed with roof joists, the unobstructed vent area shall be not less than 1/150 of […]

Venting Clearances (attic)

Venting Clearances (attic) (1) Except as provided in Sentence (2), where venting is provided to a roof joist space, not less than 63 mm of space shall be provided between the top of the insulation and the underside of the roof sheathing. (2) Where venting is provided at the junction of sloped roofs and exterior walls […]

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 […]