Trimmer Joists
(1) Trimmer joists around floor openings shall be doubled when the length of the header joist exceeds 800 mm.
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(2) When the header joist exceeds 2 m in length, the size of the trimmer joists shall be determined by calculations.
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Article 9.23.9.6. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.
