Table 1
FLOOR BEARERS – Supporting single or upper storey loadbearing walls – FLW 1200
AS 1684.2 — Cl. 4.3.1.1
Single or Upper Storey
Figure 4.6 — Bearers supporting loadbearing walls
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Figure 4.6 — AS 1684.2:2021 p.45 · Table 1 applies to diagram (a): Single or upper storey
FLW = width of floor area supported by the bearer (this table: 1200 mm).
RLW = width of roof carried by the bearer, from centreline to ridge or next support. Refer AS 1684.2 Cl. 2.6.4.
RLW = width of roof carried by the bearer, from centreline to ridge or next support. Refer AS 1684.2 Cl. 2.6.4.
Design Parameters
Wind Classification
Per AS 4055 or AS 1170.2. Sydney suburban = typically N2. Exposed coastal or elevated = N3. Very exposed = N4.
Roof Type
Sheet roof: max total mass 40 kg/m² (roof + framing + ceiling). Tile roof: max 90 kg/m². Refer AS 1684.2 Appendix B.
Timber Seasoning
Seasoned: MC ≤19%. Unseasoned: MC >19%. Check the grade stamp.
Stress Grade
MGP10/12/15 = machine graded pine. F14 WA = WA seasoned hardwood. Select seasoning first.
Span Condition
Single span: bearer supported at two points only. Continuous span: bearer runs over 3 or more supports — allows longer spans for the same size. Refer AS 1684.2 Cl. 1.3.5.
Roof Load Width
RLW = half the distance between roof supports on each side of the bearer (bearer centreline to ridge or next support). Select the column equal to or greater than your actual RLW.
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Results
AS 1684.2 — Table 1| Size D×B (mm) | Max Span (mm) | Cantilever (mm) |
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Table Notes — AS 1684.2 Table 1
- Spans based on max sheet roof + framing + ceiling 40 kg/m², tile 90 kg/m², flooring 40 kg/m². Refer Appendix B.
- Cantilevers shall not exceed 50% of actual backspan. (Cl. 4.2.1.2)
- 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 4.6 of AS 1684.2:2021.
- Loadbearing walls at right angles to bearer within span: refer Cl. 4.3.1.5.
- Bearers supporting roof point loads: refer Cl. 4.3.1.6.
Find a Size
Wind Classification
Per AS 4055 or AS 1170.2. Sydney suburban = typically N2. Exposed coastal or elevated = N3. Very exposed = N4.
Roof Type
Sheet roof: max total mass 40 kg/m² (roof + framing + ceiling). Tile roof: max 90 kg/m².
Span Condition
Single span: bearer supported at two points only. Continuous span: bearer runs over 3 or more supports.
Roof Load Width
Select the RLW column that equals or exceeds your actual roof load width.
Required Span (mm)
The clear span your bearer needs to achieve, in millimetres. All sizes with a tabulated span equal to or greater than this value will be shown.
Seasoning Filter
Filter to seasoned or unseasoned only, or show all timber types.
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Options satisfying your span
Professional Disclaimer: This calculator is a digital reading aid for AS 1684.2 span table supplements only. All results must be verified by a suitably qualified engineer or building designer against the current edition of AS 1684.2. Site conditions, connections, durability and NCC compliance are not assessed. Structopedia accepts no liability for use of these results.