Roof Rafter Spacing Australia

Pergola rafter spans for 600 mm and 900 mm spacing.

Roof rafter spacing australia.

2 for design parameters refer to figure 7 26. They are also engineer certified to meet as 1684 2 2010 and wind loading requirements up to n4. 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. Rafters must be strong enough to hold the roof sheathing and the shingles.

We also supply e battens at 65mm x 35mm in 6 3 metre lengths to match truss and rafter spacing. Pitching beams 23 common installation details 25 notches cuts and holes in beams. Wind classification n1 n2. Builders aren t bound by standard rafter spacing measurements.

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. But they do tend to space rafters in one of several industry standard increments typically. 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.

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. Tables such as those for rafters. Live load overhang kpa. 1 refer to general notes for information that is relevant for all span tables.

Rafters 12 ceiling joists 15 hanging beams member16 underpurlins 17 strutting beams 18 roof beams 20 verandah beams 22 garage roof. 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. Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002. A maximum roof pitch of 25 degrees is assumed.

If your local building authority has a rafter spacing code you may not space rafters wider than required by code. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. 3 where rafters are equal to or exceed four times their breath blocking should be used to reduce distortion.