Table 49
DECK BEARERS — More than 1 m off the ground
AS 1684.2 — Supplement 6
FLW 1200 – 4800 mm
Decking mass ≤ 20 kg/m²
Figure 4.7 — Bearers supporting floor loads only
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AS 1684.2:2021 Figure 4.7 — Deck bearer arrangement showing floor load width (FLW), bearer span and cantilever. For bearers more than 1 m above ground use Table 49; for bearers up to 1 m above ground refer to Table 5.
Inputs
Timber Grade
Select the stress grade and seasoning. MGP grades are seasoned softwood machine-graded pine. Unseasoned timber (green) uses US grades; seasoned (air or kiln dried) uses F or MGP grades.
Floor Load Width (FLW)
FLW = half the sum of the spans of the decking joists on each side of the bearer. Select the column equal to or just exceeding your actual FLW.
Span Condition
Single span = bearer supported at two ends only. Continuous span = bearer continues over three or more supports (larger spans achievable).
Please select grade, FLW and span condition to calculate.
Results
AS 1684.2 Supp. 6 — Table 49| Size D×B (mm) | Span (mm) | Cantilever (mm) |
|---|
Table 49 Notes
- Maximum bearer span is based on supporting a maximum decking mass of 20 kg/m².
- Cantilevers shall not exceed 30% of the actual backspan.
- Bearer sizes may support decks more than 1000 mm above ground. For bearers supporting decks up to 1000 mm above ground, refer to Table 5.
- Minimum bearing length = 50 mm at end supports and 100 mm at internal supports for continuous members. Additional bearing length may be required where indicated in the standard.
- Multiple members shall be nailed together per Clause 2.3.
- For design parameters refer to Figure 4.7.
Find sizes achieving a required span
Required Bearer Span (mm)
Floor Load Width (FLW)
Span Condition
Filter by Seasoning (optional)
Please enter required span, FLW and span condition.
Qualifying Sizes
Disclaimer: For guidance only. Verify results against current AS 1684.2 and applicable project conditions. Not a substitute for professional engineering advice.