Framing Second Floor Joists

At most home improvement centers you can also have your lumber cut to the desired specifications when you order it.

Framing second floor joists.

Dead load weight of structure and fixed loads 10 lbs ft 2. This size is no longer acceptable when framing a structure. What this means is that the first story ceiling joists will also serve as the floor joists for the second story. While first floor supports are needed to account for the additional weight of a second floor the walls are pretty much the same as those of a single story home.

In the past 2x4s or 2x6s were sometimes used as floor joists. 1 ft 0 3048 m. To frame a floor that s 12 feet 3 7 m x 18 feet 5 5 m you would need 4 12 ft 3 7 m sill plate boards 4 18 ft 5 5 m rim joist boards and 9 18 ft 5 5 m main floor joists. The floor joist spacing is the distance between the centers of any two installed joists.

Maximum floor joist span for no. But larger is not always better when builders are constructing a home or adding a room addition. Floor joists align with the wall studs which align with the first story floor joists. Floor joists installed on second or third or higher levels double as ceiling joists for the level below.

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. See the image below for an example of joists spaced 16 on center 16 o c. Live load is weight of furniture wind snow and more. 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.

1 psf lb f ft 2 47 88 n m 2. Section r502 10 of the international residential code states that header joists can be the same size as the floor joists when the header joist span isn t greater than 4 feet but if the header joist span is more than 4 feet you ll need to double the header joist and ensure that it s capable of. In buildings with basements the first level of floor joists serves the same purpose. 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.