Floor Joist Spacing Chart

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

Floor joist spacing chart.

How do i keep them even. How far apart are floor joists placed. Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor. But larger is not always better when builders are constructing a home or adding a room addition.

This a rough guideline. In general terms joists spaced 16 inches on center can span 1 5 times in feet their depth in inches. 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 extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example.

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. 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. See the image below for an example of joists spaced 16 on center 16 o c. The floor joist spacing is the distance between the centers of any two installed joists.

A lot of questions revolve around joists when it comes to building a deck. Floor joist span tables for various sizes and species of wood. What is the proper placement. A 2x8 up to 12 feet.