Roof Joist Span Table

If this is the case with your structure use the floor joist table to determine maximum joist length load.

Roof joist span table.

For example the highlighted cell below shows that a 2 x 6 southern yellow pine joist with a grade of 2 and spaced 24 apart can have a maximum span of 10 feet 0 inches 10 0 if you are designing your structure to support a plaster ceiling. Tables listing maximum spans for southern pine joists and rafters are detailed below. Span calculator for wood joists and rafters also available for the android os. Table r802 4 1 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf l δ 240 check sources for availability of lumber in lengths greater than 20 feet.

Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Joist and rafter span tables. 1 inch 25 4 mm 1 foot 304 8 mm 1 pound per square foot 0 0479kpa. View joist rafter tables.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. For each application a pdf download is available. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.