Roof Rafter Spacing Australia

Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002.

Roof rafter spacing australia.

Roof area supported post a post b rafter overhang half rafter span hot dipped galvanised stirrup top of footing slopped away from post concrete footing or rammed earth back ll 100 mm 75 mm course gravel laid at the base of the post concrete footing a fixed to stirrup b embedded in ground figure 3 installing posts beam overhang. Just keep in mind that if the length of the board size is more than 20 feet then you need to use a more expensive type of lvl board and not a traditional pine. Tables such as those for rafters. If your local building authority has a rafter spacing code you may not space rafters wider than required by code.

Pergola rafter spans for 600 mm and 900 mm spacing. 2 for design parameters refer to figure 7 26. Rafters 12 ceiling joists 15 hanging beams member16 underpurlins 17 strutting beams 18 roof beams 20 verandah beams 22 garage roof. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.

A maximum roof pitch of 25 degrees is assumed. 3 where rafters are equal to or exceed four times their breath blocking should be used to reduce distortion. 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. But they do tend to space rafters in one of several industry standard increments typically.

Rafter and roof joist spacing is only one part of a complex roof design that works together to form a structure that meets building codes and can hold up the weight of the roof and roof load. Wind classification n1 n2. We also supply e battens at 65mm x 35mm in 6 3 metre lengths to match truss and rafter spacing. Builders aren t bound by standard rafter spacing measurements.

This is an exciting product made from structural laminated veneer lumber lvl that meets the as nzs4357 standard. Pitching beams 23 common installation details 25 notches cuts and holes in beams. 1 refer to general notes for information that is relevant for all span tables. Rafters must be strong enough to hold the roof sheathing and the shingles.

This is set by the roof use you selected in the previous screen and cannot be modified. 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. Live load overhang kpa.