Roof Rafter Spacing 2x4

As mentioned above a 2 4 spf shed roof rafter can span 11.

Roof rafter spacing 2x4.

Builders aren t bound by standard rafter spacing measurements. For standard shed roof rafter spacing see rafter span chart. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. Span calculator for wood joists and rafters also available for the.

Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. An syp rafter can span 11. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Both of these are for light roof loads.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. 1 psf lb f ft 2 47 88 n m 2. There is no standard spacing it depends on what size of rafters you want to use and the span of your shed. Rather than having 2 4 purlins every 12 it would make far more sense economically to use 2 6 purlins every 24.

It is always better to have a large rafter rather than be concerned with a sagging roof. Live load is weight of furniture wind snow and more. 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. Rafters must be strong enough to hold the roof sheathing and the shingles.

1 ft 0 3048 m. Dead load weight of structure and fixed loads 15 lbs ft 2. If your local building authority has a rafter spacing code you may not space rafters wider than required by code. Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

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. 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. For instance 2 grade 2x4s at 16 on center will span just over 9. Spacing in exterior exposure.