Floor Joist Span Chart

True floor joist span calculations can only be made by a structural engineer or contractor.

Floor joist span chart. 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. Looking at this table you will see there is a choice in the size of floor joist 2 x 6 2 x 8 2 x 10 or 2 x 12 and there is a choice in the joist spacing 12 16 or 14. The floor joist spacing is the distance between the centers. Live load is weight of furniture wind snow and more.

2 grade of douglas fir are indicated below. Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in. Maximum floor joist span for no. 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.

Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. Sample floor joist span table. 1 ft 0 3048 m. Joist span and spacing is set by your local building code.

The table excerpt above is simply a sample and may not be valid for your region. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability. While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length.

View joist rafter tables. 1 psf lb f ft 2 47 88 n m 2. Engineered wood products ewp span and size charts for bci joists. Also available for the android os.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Dead load weight of structure and fixed loads 10 lbs ft 2. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. Span calculator for wood joists and rafters also available for the android os.