Span Roof Rafters

Input the rafter span on the flat eave overhang and pitch of the roof.

Span roof rafters.

This rafter span calculator is species specific for douglas fir hemlock etc. Rafter stock size calculator. Click the button to calculate the stock size needed for this job. To size joists and rafters use the maximum span tables for southern yellow pine.

The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter. Dead load weight of structure and fixed loads 15 lbs ft 2. The lengths and sizes of joists vary depending on the species and quality of the lumber used. Anything beyond that you are looking at using 2x6s for most sheds.

Span calculator for wood joists and rafters also available for the android os. This calculator is to be used as an estimating tool only. 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. 1 psf lb f ft 2 47 88 n m 2.

2 are indicated below. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. So this table could accommodate a house with a total rafter span or house width of 32 feet. Both of these are for light roof loads.

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. 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. The 1 grade. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. Live load is weight of furniture wind snow and more. The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size. 1 ft 0 3048 m.

Also available for the android os. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. As mentioned above a 2 4 spf shed roof rafter can span 11.

This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.