Construction codes of Ontario

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Holes Drilled in Framing Members

Holes Drilled in Framing Members (1) Holes drilled in roof, floor or ceiling framing members shall be not larger than one-quarter the depth of the member and shall be located not less than 50 mm from the edges, unless the depth of the member is increased by the size of the hole. Article 9.23.5.1. Ontario Regulation […]

Installing Roof Sheathing

Installing Roof Sheathing When plywood or OSB is used for roof sheathing, sheets are laid with the face grain at right angles to the framing (Figure 97) and with the joints offset to obtain a good tie across the roof framing. Leave a 2 to 3 mm (1⁄8 in.) gap between panels to prevent buckling […]

Intermediate Support for Rafters and Joists

Intermediate Support for Rafters and Joists (1) Ceiling joists and collar ties of not less than 38 mm by 89 mm lumber are permitted to be assumed to provide intermediate support to reduce the span for rafters and joists where the roof slope is 1 in 3 or greater. (2) Collar ties referred to in Sentence […]

Joints in Panel-Type Sheathing

Joints in Panel-Type Sheathing (1) A gap of not less than 2 mm shall be left between sheets of plywood, OSB, waferboard or fibreboard. Article 9.23.16.5. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Joints in Top Plates

Joints in Top Plates (1) Joints in the top plates of loadbearing walls shall be staggered not less than one stud spacing. (2) The top plates in loadbearing walls shall be lapped or otherwise suitably tied at corners and intersecting walls in accordance with Sentence (4). (3) Joints in single top plates used with loadbearing walls […]

Joints Offset Panel-Type Underlay

Joints Offset Panel-Type Underlay (1) Where panel-type underlay is required to be installed over plywood, or OSB or waferboard, the joints in the underlay shall be offset at least 200 mm from the joints in the underlying subfloor. Article 9.30.2.4 Ontario Regulation 332/12 Building Code, O. Reg. 332/12: BUILDING CODE (ontario.ca) © Queen’s Printer for […]

Joists Supported by Beams

Joists Supported by Beams (1) Floor joists may be supported on the tops of beams or may be framed into the sides of beams. (2) When framed into the side of a wood beam, joists referred to in Sentence (1) shall be supported on, (a) joist hangers or other acceptable mechanical connectors, or (b) not […]