Skillion Roof Rafter Span Tables

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002. Table 33 bearers supporting two storey loadbearing walls lower floor load width 900mm or 1800mm continued seasoned hardwood f17.

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Skillion roof rafter span tables.

R cb150 16 beam span table used w 3600 width of frame rafter span χ 6410 fascia beam span the cb150 16 beam achieves the 6000mm span for the fascia beam and can be used for the rafters. Select and re calculate to display. Rafter span 3 000 m. This is a heavy roof so the 1200 mm column on the right side of the table is excluded it only applies to light roofs.

If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. Skillion roof rafter detail diagram with all dimensions and birds mouths scale. Sheet roofing tiled roofing roof load width rlw mm 1500 2100 4500 7500 1500 2100 4500 7500. Design of single span rafters in roofs in houses office buidlings schools and other structures.

This is set by the roof use you selected in the previous screen and cannot be modified. The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size. Attached flat roof 1ao page14. Select output fraction precision decimal inch or metric mm.

Anything beyond that you are looking at using 2x6s for most sheds. Choose rafter spacing from table 10 1 the options are 480 600 or 900 mm. The imposed uniformly distributed live load in the main span. Maximum span of bearer mm upper floor load width 3600mm continued continuous spans.

Step 1 rafter spacing. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.