Floor Joist Span

Live load 30 lbs ft 2 1436 n m 2.

Floor joist span. Maximum floor joist span for no. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider. Reading the table you ll see that 2 x 8s installed 16 apart on center can span 12 4.

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. So our house would look like the picture below with all floor joists 2 x 8. 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. Live load is weight of furniture wind snow and more. 1 psf lb f ft 2 47 88 n m 2.

Dead load weight of structure and fixed loads 10 lbs ft 2. 1 ft 0 3048 m. These elements will greatly affect how far you can span your joists.

1 in 25 4 mm. Maximum span of 2x12 floor joist the most important design choices to consider when building a home are the species and grade of wood that is being used as well as joist size and spacing. 2 grade of douglas fir are indicated below.