22.214.171.124. Trimmer joists
(1) Trimmer joists around floor openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings shall be doubled when the length of the header joist exceeds 800 mm.
(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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