Roof Rafter Spacing 2x4

There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.

Roof rafter spacing 2x4.

1 psf lb f ft 2 47 88 n m 2. Both of these are for light roof loads. It is always better to have a large rafter rather than be concerned with a sagging roof. An syp rafter can span 11.

Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. Rather than having 2 4 purlins every 12 it would make far more sense economically to use 2 6 purlins every 24. For instance 2 grade 2x4s at 16 on center will span just over 9. As mentioned above a 2 4 spf shed roof rafter can span 11.

Live load is weight of furniture wind snow and more. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Rafters must be strong enough to hold the roof sheathing and the shingles.

1 ft 0 3048 m. 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. Spacing in exterior exposure. But they do tend to space rafters in one of several industry standard increments typically either 12 16 or 24 inches apart.

Dead load weight of structure and fixed loads 15 lbs ft 2. If you live in an area that requires a shed roof rafter to support a heavy load then an spf rafter can only span 7. Without even running the calculations i would say there is a good chance the 2 4 purlins will not make the deflection criteria required for a roof framing member supporting steel. 2 are indicated below.

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. Span calculator for wood joists and rafters also available for the. Builders aren t bound by standard rafter spacing measurements. If your local building authority has a rafter spacing code you may not space rafters wider than required by code.