Construction codes of Ontario

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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 Roofing Materials

Heavy Roofing Materials (1) Where a roof is required to support an additional uniform dead load from roofing materials such as concrete roofing tile, or materials other than as specified in Section 9.26., such as clay roofing tiles, the additional load shall be allowed for by reducing, (a) the spans for roof joists and rafters […]

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 […]

Heavy Timber Construction Alternative

Heavy Timber Construction Alternative (1) If combustible construction is permitted and is not required to have a fire-resistance rating more than 45 min, heavy timber construction is permitted to be used. (2) If heavy timber construction is permitted, it shall conform to Article 3.1.4.7. Article 3.1.4.6 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for […]

Heavy Timber Dimensions Table

Table 3.1.4.7.Heavy Timber Dimensions Forming Part of Sentence 3.1.4.7.(2) Table 3.1.4.7 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Hip and valley rafters

Hip and valley rafters Hip and valley rafters should be about 50 mm (2 in.) deeper than common rafters (Figures 83, 85 and 87). This additional depth provides full contact with the angle-cut of the jack rafters. In hip roofs, the jack rafters are nailed to the hip rafters and wall plate. Where a valley […]