Table 5
FLOOR BEARERS – Supporting floor load only
AS 1684.2 — Cl. 4.3.1.2
Floor Load Only
FLW 1200 – 6000 mm
Figure 4.7 — Bearers supporting floor loads only
Show ▼
AS 1684.2:2021 Figure 4.7 — Floor bearers. Shows the arrangement of floor bearers, floor joists, stumps/piers and floor load width (FLW) parameters used in Tables 1–5.
Parameters
Wind Classification
Per AS 4055 or AS 1170.2. For floor-load-only bearers, the wind class has no effect on spans but select it to match the project supplement.
Span Condition
Single span: bearer supported at two points only. Continuous span: bearer runs over 3 or more supports.
Floor Load Width
Floor Load Width = half the sum of the spans of the floor joists on each side of the bearer. Select the column equal to or just exceeding your actual FLW.
Timber Grade
Select the stress grade of the timber to be used. MGP grades are machine graded pine (seasoned softwood). F-grades are visually graded. F14 WA is Western Australian seasoned hardwood.
⚠ Please complete all fields before calculating.
Results
AS 1684.2 — Table 5| Size D×B (mm) | Max Span (mm) | Cantilever (mm) |
|---|
Table Notes — AS 1684.2 Table 5
- Spans based on a maximum flooring mass of 40 kg/m². No roof load is assumed.
- Cantilevers shall not exceed 50% of actual backspan.
- Minimum bearing = 50 mm at end supports; 100 mm at internal supports for continuous members.
- Multiple members shall be nailed together per Cl. 2.3.
- For design parameters refer to Figure 4.7 of AS 1684.2.
- Use Tables 1–4 where bearers also support roof loads.
Disclaimer: This calculator references span tables from AS 1684.2 Supplements (2010). Results are for guidance only and must be verified by a suitably qualified engineer or building designer against the current edition of the Standard and project-specific conditions. Structopedia accepts no liability for errors or omissions.
Find a Size
Wind Classification
For floor-load-only bearers, wind class has no effect on spans but is included for supplement consistency.
Span Condition
Single span: bearer supported at two points only. Continuous span: bearer runs over 3 or more supports.
Floor Load Width
Select the FLW column equal to or just exceeding your actual floor load width.
Required Span (mm)
Enter the minimum bearer span required (clear distance between supports), in millimetres.
Timber Seasoning
Seasoned = dry timber. Unseasoned = green timber (larger cross-sections). Leave blank to show all.
⚠ Please complete all fields before calculating.
Suitable Sizes
Disclaimer: This calculator references span tables from AS 1684.2 Supplements (2010). Results are for guidance only and must be verified by a suitably qualified engineer or building designer against the current edition of the Standard and project-specific conditions. Structopedia accepts no liability for errors or omissions.