Rafters and Verandah Beams
Rafters F7 Span Guide
Sheet Roof – Maximum allowable spans (mm)
Note: 25 degree maximum pitch, N3, single span, no ceiling and roof load – 25kg/m2. Use the drawing above to identify the relevant measurements for calculating rafter and verandah beam sizes.
Verandah Beams F7 Span Guide
Sheet Roof – Maximum allowable spans (mm)
Roof load width (mm)
Verandah Beams GL8 Span Guide
Sheet Roof – Maximum allowable spans (mm)
Roof load width (mm)
Deck Bearers and Joists
Deck Joist F7 Span Guide
Single Span – Maximum allowable spans (mm)
Joist Spacing (mm)
Deck Bearer F7 and GL8 Span Guide
Single Span – Maximum allowable spans (mm)
F7 – Floor Load Width (mm)
GL8- Floor Load Width (mm)
3.0 KPa Live Load – Single Span
Spans may be increased by 10% when continuous over two or more spans.
Refer to the formula Floor Load Width (FLW) calculations.
Posts
Sheet Roof – N1/N2/N3 Wind
Tile Roof – N1/N2/N3 Wind
NOTES: These Posts tables do not allow for any floor loading which may come on to the posts.
N4, N5, and N6 wind are similar but each case should be checked by an engineer for specific loadings, e.g. added floor loads and bracing requirements.
