Floor Joist Span Chart

Sample floor joist span table.

Floor joist span chart.

Floor joist span tables for various sizes and species of wood. 2 grade of douglas fir are indicated below. Also available for the android os. 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.

Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Span calculator for wood joists and rafters also available for the android os. The spans are based on simple span joists. 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.

Live load is weight of furniture wind snow and more. The maximum span is measured o c. View joist rafter tables. Dead load weight of structure and fixed loads 10 lbs ft 2.

Of bearings and is based on uniformly loaded joists. 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. 1 psf lb f ft 2 47 88 n m 2. Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in.

Joist span and spacing is set by your local building code. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. The table has two column sections one for joists without a cantilever and one for joists with a cantilever. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

The floor joist spacing is the distance between the centers. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. True floor joist span calculations can only be made by a structural engineer or contractor. 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.

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. The table excerpt above is simply a sample and may not be valid for your region.