Live load is weight of furniture wind snow and more.
Floor joist span 2x12.
See our complete chart of floor joist size span and spacing requirements before you build.
Floor joist span tables for various sizes and species of wood.
Dead load weight of structure and fixed loads 10 lbs ft 2.
Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span.
1 psf lb f ft 2 47 88 n m 2.
Spans in this table were derived from the irc table r502 3 1 2 design criteria.
True floor joist span calculations can only be made by a structural engineer or contractor.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Span calculator for wood joists and rafters also available for the android os.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
View joist rafter tables.
Maximum floor joist span for no.
Also available for the android os.
2 grade of douglas fir are indicated below.
This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.
Hem fir 2 joists with a live dead load of 40 10 psf.
Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in.