Roof Framing Span Tables

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.

Roof framing span tables.

View joist rafter tables. The figures are based on quality materials. These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013. The tables below give maximum spans for rafters and beams.

For each application a pdf download is available. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. So this table could accommodate a house with a total rafter span or house width of 32 feet.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. Rafter spans for southern yellow pine douglas fir and eastern spruce.

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. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Span calculator for wood joists and rafters also available for the android os. Joist and rafter span tables.

Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Also available for the android os.