Floor Joists Timber Framing Span Tables

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Floor joists timber framing span tables.

To use the joist span calculator below first select the species of lumber you will use for your construction project from the drop down list. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Also available for the android os. Span calculator for wood joists and rafters also available for the android os.

These tables can also be used to determine deck joist span. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Floor joist span tables for various sizes and species of wood 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. Straight line interpolation shall be permitted for intermediate spans and design values.

The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center.