Max Span For 2x12 Floor Joist

See our complete chart of floor joist size span and spacing requirements before you build.

Max span for 2x12 floor joist. True floor joist span calculations can only be made by a structural engineer or contractor. In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above. 2 grade of douglas fir are indicated below. Maximum floor joist span for no.

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. Live load is weight of furniture wind snow and more. The larger the deck the larger the joists.

Also available for the android os. We ve included 2x6 2x8 2x10 and 2x12 joist spans and more. The maximum span distance for 12 inch spacing is greater by as much as 30 percent compared to 24 inch spacing. Joists that are closer together can support more weight which allows the joists to span a longer distance than joists spaced further apart.

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. Dead load weight of structure and fixed loads 10 lbs ft 2. 1 psf lb f ft 2 47 88 n m 2. 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. Spacing is measured from the center of one joist to the center of the next. A 2x8 up to 12 feet. These tables can also be used to determine deck joist span.