Wood Roof Joist Span Tables

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.

Wood roof joist span tables.

Span tables building division. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Straight line interpolation shall be permitted for intermediate spans and design values. Span calculator for wood joists and rafters also available for the android os.

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

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. Design information for all joists tji joist floor framing 24 rim board selection and installation 25 floor details 26 27 roof framing 28 roof details 29 30 cut length calculation 31 material weights and. Floor span and load tables 17 allowable holes 18 roof span and load tables 19 cantilevers 20 21 framing connectors 22 23 section 3. 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.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Also available for the android os. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.