Construction codes of Ontario

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Floors over Unconditioned Spaces

Floors over Unconditioned Spaces Floors over unheated crawl spaces or over garages must be insulated. It is common to fill the space between the floor sheathing and a gypsum board ceiling under the floor with insulation. Where there is no finished ceiling on the underside of the floor, the insulation must be supported (to prevent […]

Framing for Floor Openings where Double Headers and Double Trimmers are used

Framing for Floor Openings where Double Headers and Double Trimmers are used When framing for large openings such as stairwells or fireplaces, the trimmer joists must be doubled if they support header joists (joists into which other joists are framed) more than 800 mm (32 in.) long. Header joists longer than 1.2 m (4 ft.) […]

Framing Supported on Flat Insulating Concrete Form Walls

Framing Supported on Flat Insulating Concrete Form Walls (1) Floor joists supported on the side of flat insulating concrete form walls shall be supported with joist hangers secured to wood ledger boards. (2) The ledger boards described in Sentence (1) shall be not less than, (a) 38 mm thick, and (b) the depth […]

Grade Marking (Lumber and Wood Products)

Grade Marking (1) Lumber for joists, rafters, trusses and beams and for the uses listed in Table 9.3.2.1. shall be identified by a grade stamp to indicate its grade as determined by the NLGA, “Standard Grading Rules for Canadian Lumber”. Article 9.3.2.1 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Header Joists

Header Joists (1) Header joists around floor openings shall be doubled when they exceed 1.2 m in length. (2) The size of header joists exceeding 3.2 m in length shall be determined by calculations. Article 9.23.9.5. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Heavy Timber Construction

(1) Wood elements in heavy timber construction shall be arranged in heavy solid masses and with essentially smooth flat surfaces to avoid thin sections and sharp projections. (2) Except as permitted by Sentences (3) to (6) and (12), the minimum dimensions of wood elements in heavy timber construction shall conform to Table 3.1.4.7. (3) Where splice plates […]

Hydrostatic Pressure (floor-on ground)

Hydrostatic Pressure floor-on ground (1) Where groundwater levels may cause hydrostatic pressure beneath a floor-on-ground, the floor-on-ground shall be, (a) a cast-in-place concrete slab, and (b) designed to resist such pressures Article 9.16.3.2 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.