Wood Roof Span Tables

Use these two tables for roof rafters with a slope greater than 3 in 12.

Wood roof span tables.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Also available for the android os. Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria. The above spans are based on american softwood lumber standard sizes.

View joist rafter tables. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Joist and rafter span tables. For additional species of lumber check out the rafter span calculator from the american wood council website. Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70. Use these two tables for roof rafters with a slope of 3 in 12 or less.

Span calculator for wood joists and rafters also available for the android os.