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.

Floor joist span chart. 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. For two equal spans the listed span is the center to center distance from either end to the center support. 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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

1 ft 0 3048 m. Floor joist span tables for various sizes and species of wood. Sample floor joist span table. Also available for the android os.

Dead load weight of structure and fixed loads 10 lbs ft 2. View joist rafter tables. 2 grade of douglas fir are indicated below. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in. Live load is weight of furniture wind snow and more. The maximum span is measured o c. 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. The table has two column sections one for joists without a cantilever and one for joists with a cantilever. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. The floor joist spacing is the distance between the centers.

The spans are based on simple span joists. Span calculator for wood joists and rafters also available for the android os. 1 psf lb f ft 2 47 88 n m 2. Table notes spans are based upon continuous support of compression flange over the full length of the joist.

Of bearings and is based on uniformly loaded joists. 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. Calculated allowable properties are based upon aisi s100 07 north american specification for the design of cold formed steel structural members.