Roof Framing Span Tables

The tables below give maximum spans for rafters and beams.

Roof framing span tables.

For each application a pdf download is available. 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. Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

View joist rafter tables. Also available for the android os. 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. Tables such as those for rafters floor joists and ceiling joists require the spacing of members to be known or selected in order to obtain the required size for a given span.

Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. So this table could accommodate a house with a total rafter span or house width of 32 feet. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The figures are based on quality materials.

Joist and rafter span tables. Tables listing maximum spans for southern pine joists and rafters are detailed below. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Span calculator for wood joists and rafters also available for the android os.

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.