Roof Rafter Spacing Australia

Rafters must be strong enough to hold the roof sheathing and the shingles.

Roof rafter spacing australia. We also supply e battens at 65mm x 35mm in 6 3 metre lengths to match truss and 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. Technical diagram span tables f7 rafters on page 35 30mm m aximum allow able sp ans mm sheet roof spacing mm rafter size 600 760 900 1000 1200 66 x 30 1250 1150 1050 1000 950 90 x 30 1650 1550 1550 1400 1300 138 x 30 2600 2300 2150 2000 1800 185 x 30 3000 2650 2450 2350 2150 230 x 30 3050. It is always better to have a large rafter rather than be concerned with a sagging roof.

Rafters 12 ceiling joists 15 hanging beams member16 underpurlins 17 strutting beams 18 roof beams 20 verandah beams 22 garage roof. Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. 2 for design parameters refer to figure 7 26. Builders aren t bound by standard rafter spacing measurements.

3 where rafters are equal to or exceed four times their breath blocking should be used to reduce distortion. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. If your local building authority has a rafter spacing code you may not space rafters wider than required by code. Live load overhang kpa.

A maximum roof pitch of 25 degrees is assumed. This is set by the roof use you selected in the previous screen and cannot be modified. Pitching beams 23 common installation details 25 notches cuts and holes in beams. Tables such as those for rafters.

Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002. 1 refer to general notes for information that is relevant for all span tables. 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. Pergola rafter spans for 600 mm and 900 mm spacing.

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. But they do tend to space rafters in one of several industry standard increments typically. Wind classification n1 n2. This is an exciting product made from structural laminated veneer lumber lvl that meets the as nzs4357 standard.