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Reference — AS 1684.2 Figure 7.24
Table 27 — Strutting Beams supporting roof loads only (no ceiling load component).
Sheet roof: maximum total roof mass 20 kg/m². Tile roof: maximum total roof mass 60 kg/m².
A minimum initial clearance of 25 mm shall be provided at mid-span between the underside of the strutting beam and the tops of ceiling joists, ceiling lining or ceiling battens.
Multiple members shall be nailed together per Clause 2.3. Minimum bearing = 70 mm at end supports.
Where depth-to-breadth ratio > 3:1, provide G.I. strapping restraint to top edge at strutting points and beam ends (Clause 7.2.26).
Spans are independent of wind classification.