Wood Roof Joist Span Tables

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.

Wood roof joist span tables.

View joist rafter tables. 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. 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.

Allowable spans for joists and rafters 1 7 lumber grade floor joists ceiling joists 5 rafter ceiling joist. Also available for the android os. Floor span and load tables 17 allowable holes 18 roof span and load tables 19 cantilevers 20 21 framing connectors 22 23 section 3. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Span tables building division. 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.

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