Table 50
DECK JOISTS — More than 1 m off the ground
AS 1684.2 — Supplement 6
Joist spacing 300 – 600 mm
Decking mass ≤ 20 kg/m²
Figure 4.9 — Floor joists
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AS 1684.2:2021 Figure 4.9 — (a) Deck joist span and joist spacing. (b) Loadbearing wall offset. Joist spacing = centre-to-centre distance between joists. For deck joists more than 1 m above ground use Table 50.
Inputs
Timber Grade
Select the stress grade and seasoning of the deck joist timber.
Joist Spacing
Centre-to-centre spacing between deck joists. Select the column equal to or just exceeding your actual spacing.
Span Condition
Single span = joist supported at two ends only. Continuous span = joist runs over three or more supports.
Please select grade, joist spacing and span condition.
Results
AS 1684.2 Supp. 6 — Table 50| Size D×B (mm) | Span (mm) | Cantilever (mm) |
|---|
Table 50 Notes
- Maximum joist span is based on supporting a maximum decking mass of 20 kg/m².
- Cantilevers shall not exceed 30% of the actual backspan.
- Joist sizes may support decks more than 1000 mm above ground. For joists supporting decks up to 1000 mm above ground, refer to Table 6.
- Minimum bearing length = 50 mm at end supports and 100 mm at internal supports for continuous members.
- For design parameters refer to Figure 4.9.
Find sizes achieving a required span
Required Joist Span (mm)
Joist Spacing
Span Condition
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Please enter required span, spacing 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.