Rafter Span Floor Joist Span Table

Deflection for 30 psf live load.

Rafter span floor joist span table. Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.

For each application a pdf download is available. These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013. Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value. Tables listing maximum spans for southern pine joists and rafters are detailed below.

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Also available for the android os. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Span calculator for wood joists and rafters also available for the android os.