Outdoor Structural Applications

Rafters and Verandah Beams

Rafters F7 Span Guide Sheet Roof – Maximum allowable spans (mm)
Rafter SizeSpacing 900mmRafter SizeSpacing 900mm
138 x 302150138 x 422800
185 x 302450185 x 423730
230 x 302600230 x 424400
280 x 303200280 x 424780
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)
Size (mm)9001200150018002100
138 x 4224702240206019101800
185 x 4230702770255023802230
230 x 4234503120287026702510
280 x 4236403300303028202650
Verandah Beams GL8 Span Guide Sheet Roof – Maximum allowable spans (mm) Roof load width (mm)
Size (mm)6009001200150018002100240027003000
180 x 65359033103000276025702410228021702070
240 x 65423039703680339031502960280026602550
280 x 65490046004280393036603440325031002960
 

Deck Bearers and Joists






















Deck Joist F7 Span Guide Single Span – Maximum allowable spans (mm) Joist Spacing (mm)
Size (mm)450600
138 x 4221002000
185 x 4229002600
230 x 4235003300
280 x 4240003700
Deck Bearer F7 and GL8 Span Guide Single Span – Maximum allowable spans (mm) F7 – Floor Load Width (mm)
Size (mm)120018002400
185 x 42207017301530
230 x 42264022101940
280 x 42329027302390
GL8- Floor Load Width (mm)
Size (mm)180021002400
280 x 65344030002710
240 x 65292025502310
180 x 65216018901720
140 x 65165014501320
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.