Roof Rafter Spacing 2x4

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.

Roof rafter spacing 2x4.

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. 1 psf lb f ft 2 47 88 n m 2. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.

1 ft 0 3048 m. Both of these are for light roof loads. 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. Span calculator for wood joists and rafters also available for the.

Rafters must be strong enough to hold the roof sheathing and the shingles. For standard shed roof rafter spacing see rafter span chart. An syp rafter can span 11. 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. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. 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 is weight of furniture wind snow and more. For instance 2 grade 2x4s at 16 on center will span just over 9. But they do tend to space rafters in one of several industry standard increments typically either 12 16 or 24 inches apart. Rather than having 2 4 purlins every 12 it would make far more sense economically to use 2 6 purlins every 24.

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. Dead load weight of structure and fixed loads 15 lbs ft 2. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. As mentioned above a 2 4 spf shed roof rafter can span 11.