Tables 51 & 51A
VERANDAH BEAMS — Single span
AS 1684.2 — Supplements 4 & 7
RLW 1200 – 7500 mm
Rafter/truss spacing 600 – 1200 mm
Figure 6.22 — Verandah beams
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AS 1684.2:2021 Figure 6.22 — Verandah beam arrangement showing roof load width (RLW), rafter/truss spacing and beam span. RLW = half the sum of the roof joist/rafter spans supported by the beam on each side.
Inputs
Wind Classification
Wind classification of the site per AS 4055 or AS 1684.2 Section 1. Verandah beam spans vary significantly between wind classes.
Timber Grade
MGP grades (T51) are seasoned machine-graded pine softwood. F-grades (T51A) are visually graded — select S for seasoned, U for unseasoned.
Roof Load Width (RLW)
RLW = half the sum of the spans of the rafters or trusses supported on each side of the verandah beam. Select the column equal to or just exceeding your actual RLW.
Rafter / Truss Spacing
Centre-to-centre spacing of the rafters or trusses framing into the verandah beam.
Roof & Ceiling Mass
Combined roof + ceiling mass in kg/m² of roof plan area. Select the row equal to or just exceeding your actual mass. Typical values: sheet metal roof 10–20, tiles 40–60, heavy tiled ceilings 90.
Please select all inputs to calculate.
Results
AS 1684.2| Size D×B (mm) | Max Span (mm) |
|---|
Tables 51 & 51A Notes
- Spans are maximum single spans for verandah beams supporting roof loads only.
- RLW (Roof Load Width) = half the sum of the spans of the rafters or trusses on each side of the beam.
- Roof & ceiling mass includes the combined mass of the roof covering, battens, insulation and ceiling lining.
- Minimum bearing length = 50 mm at end supports.
- For continuous span verandah beams refer to Table 52.
- MGP grades use Table 51 (AS 1684.2 Supplement 4). F-grades use Table 51A (Supplement 7).
- For design parameters refer to Figure 6.22.
Find sizes achieving a required span
Required Verandah Beam Span (mm)
Wind Classification
Roof Load Width (RLW)
Rafter / Truss Spacing
Roof & Ceiling Mass
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Please enter required span and select all parameters.
Qualifying Sizes
Disclaimer: For guidance only. Verify results against current AS 1684.2 and applicable project conditions. Not a substitute for professional engineering advice.