(1)
Trimmer joists around floor 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.
Trimmer joists around floor openings shall be doubled when the length of the header joist exceeds 800 mm.
When the header joist exceeds 2 m in length the size of the trimmer joists shall be determined by calculations.