Max Floor Joist Spacing

2x10 to 15 feet and 2x12 to 18 feet.

Max floor joist spacing.

Normally floor joists are spaced 16 inches apart on center. 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. A few of the most common factors that affect joist span include. Given that 2x8s are actually 1 inches wide it works out to be 14 inches between each joist.

Live load is weight of furniture wind snow and more. 1 psf lbf ft2 47 88 n m2. True floor joist span calculations can only be made by a structural engineer or contractor. Span calculator for wood joists and rafters also available for the android os.

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. The larger the deck the larger the joists. Floor joist table joist size joist spacing maximum span 2 x 6 12 on center 10 0 16 9 1 19 2 8 7 24 7 11 2 x 8 12 on center 13 2. A 2x8 up to 12 feet.

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

With some structures floor joists are required to be 12 or 24 inches apart on center. Also available for the android os. This means from the center of one upright joist to the center of the next. However when running spf 2 6 floor joists into the floor joist calculator referenced above you get a maximum span of 9 feet 8 inches with a minimum bearing length of 3 inches at each end on 12 centers.

Dead load weight of structure and fixed loads 10 lbs ft2. The rule of thumb is 6 foot span with a 2 6 on 16 centers. Reading the table you ll see that 2 x 8s installed 16 apart on center can span 12 4. This a rough guideline.