Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Wood floor joist span chart.
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.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Engineered wood products ewp span and size charts for bci joists.
Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability.
Floor joist span tables for various sizes and species of wood.
Span calculator for wood joists and rafters also available for the android os.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Also available for the android os.