Construction codes of Ontario

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Top Plates

Top Plates (1) Top plates in walls shall not be notched, drilled or otherwise weakened to reduce the undamaged width to less than 50 mm unless the weakened plates are suitably reinforced. Article 9.23.5.4. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Top Plates

Top Plates (1) Except as permitted in Sentences (2) to (4), no fewer than two top plates shall be provided in loadbearing walls. (2) A single top plate is permitted to be used in a section of a loadbearing wall containing a lintel provided the top plate forms a tie across the lintel. (3) A single […]

Truss or Rafter-Type Roof Ceilings

Truss or Rafter-Type Roof Ceilings Before the 1970s, conventional roof trusses were usually about 150 mm (6 in.) deep where they rested on exterior walls, which didn’t leave much space for attic insulation. Since the oil crisis of the 1970s, roof trusses have a “raised heel” design at the plane of the exterior wall, which […]

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 […]

Underlay Beneath Shingles

Underlay Beneath Shingles (1) Except as required in Sentence (2), when underlay is used beneath shingles, it shall be, (a) asphalt-saturated sheathing paper weighing not less than 0.195 kg/m², or (b) No. 15 plain or perforated asphalt-saturated felt. (2) Underlay used beneath wood shingles shall be breather type. Article 9.26.6.1. Ontario Regulation 332/12 Building Code, […]

Underlay Beneath Shingles Installation

Underlay Beneath Shingles Installation (1) When used with shingles, underlay shall be installed parallel to the eaves with head and end lap of not less than 50 mm. (2) The top edge of each strip referred to in Sentence (1) shall be fastened with sufficient roofing nails to hold it in place until the shingles are applied. […]