Wood Roof Joist Span Tables

Span tables for joists and rafters 3 american forest paper association table 9 1 required compression perpendicular to grain design values f c in pounds per square inch for simple span joists and rafters with uniform load.

Wood roof joist span tables.

Span tables building division. Span ft 1 5 2 0 2 5 3 0 3 5 2 30 22181513 4 59 44363025 6 89 67534438 8 119 89 71 59 51 10 148. Joist and rafter span tables. Straight line interpolation shall be permitted for intermediate spans and design values.

View joist rafter tables. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Roof span feet 12 20 28 36 required number of 16d common nails per connection 3 12 12 4 6 8 10 16 5 7 10 13 24 7 11 15 19. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Also available for the android os. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Los angeles residential code 8 roof ceiling construction r802 wood roof framing r802 4 allowable ceiling joist spans jump to full code chapter spans for ceiling joists shall be in accordance with tables r802 4 1 and r802 4 2. Span calculator for wood joists and rafters also available for the android os.