Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Roof joist span table.
Tables listing maximum spans for southern pine joists and rafters are detailed below.
1 inch 25 4 mm 1 foot 304 8 mm 1 pound per square foot 0 0479kpa.
Span calculator for wood joists and rafters also available for the android os.
For each application a pdf download is available.
Also available for the android os.
View joist rafter tables.
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.
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.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.