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Tables 33/34 — Floor Bearers (Lower Storey)

AS 1684.2
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Inputs

Timber Grade
Lower Floor Width — LFW (mm)
Roof Type
Span Type
Upper Floor Load Width — UFLW (mm)
Roof Load Width — RLW (mm)

Maximum Bearer Span

AS 1684.2 Table 33 — LFW 1800 mm — Wind classification N1/N2

Size (D×B mm)Max Span (mm)
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Design Reference

Figure 4.6 — Bearers supporting loadbearing walls, lower storey of two storey
Figure 4.6(b) — Bearers supporting loadbearing walls, lower storey of two storey (AS 1684.2:2021)

Notes (AS 1684.2 Tables 33 & 34):

i) Spans are based on a maximum total sheet roof, framing and ceiling mass of 40 kg/m², tile roof of 90 kg/m², and flooring mass of 40 kg/m².

ii) Bearer ends not supporting roof loads may cantilever 25% of the allowable single span, not exceeding 50% of the actual backspan.

iii) Minimum bearing length = 50 mm at end supports and 100 mm at internal supports for continuous spans. Some entries carry subscript bearing-length requirements — refer to AS 1684.2 Tables 33 or 34 directly for those cells.

iv) Multiple members nailed together as per Clause 2.3.

v) Wind classification N1/N2 only. Table 33 = Lower Floor Width 1800 mm; Table 34 = LFW 3600 mm.