2x8 Roof Rafter Span

Wood beam calculator american wood council website rafter and joist span faq.

2x8 roof rafter span. It is always better to have a large rafter rather than be concerned with a sagging roof. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. The 1 grade.

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. 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. Span calculator for wood joists and rafters also available for the android os. 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.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. The lengths and sizes of joists vary depending on the species and quality of the lumber used. Roof loads rafter spans are tabulated for the most common roof loads. Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

Dead load weight of structure and fixed loads 15 lbs ft 2. Live load is weight of furniture wind snow and more. 2 are indicated below. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof.

1 ft 0 3048 m. Also available for the android os. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. 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.