Wood Roof Joist Span Tables

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

Wood roof joist span tables.

The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. Straight line interpolation shall be permitted for intermediate spans and design values. Also available for the android os. 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 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. 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. 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. Joist and rafter span tables. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Span tables building division. Span calculator for wood joists and rafters also available for the android os. Allowable spans for joists and rafters 1 7 lumber grade floor joists ceiling joists 5 rafter ceiling joist.