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Reference — AS 1684.2 Figure 7.23
Table 26 — Strutting/Counter Beams supporting combined roof and ceiling loads (max ceiling 12 kg/m²).
Sheet roof: maximum total roof mass 20 kg/m². Tile roof: maximum total roof mass 60 kg/m².
Effective beam spacing (CLW) = x/2, where x = total of hanging beam spans either side of the strutting/counter beam.
Where hanging beam spans are not the same each side, use the average of the spans.
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 beam ends (Clause 7.2.26).
Spans are independent of wind classification.