Load Capacity Of 2x8 Floor Joists

Floor joist span tables for various sizes and species of wood 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.

Load capacity of 2x8 floor joists.

Floor joist capacity max working load 3 0 kn m 2 as pdf file floor joist capacity max working load 2 0 kn m 2 floor joist capacities for timber grade c 18 c 24 and c 30 joist center space ranging 300 to 600 mm are indicated in the diagram below. The same wall runs perpendicular to the joists on all 3 floors but not the basement. Our house has 2x10 joists under the 1st floor 2x8s under the 2nd and 2x6s under the 3rd all rough sized. 1 psf lb f ft 2 47 88 n m 2.

Dead load weight of structure and fixed loads 10 lbs ft 2 live load is weight of furniture wind snow and more. Get shopping advice from experts friends and the community. Lee has over two decades of hands on experience remodeling fixing and improving homes and has been providing home improvement advice for over 12 years. 2 grade of douglas fir are indicated below.

Floors must be able to support two different kinds of weight loads. Maximum floor joist span for no. The span where the joists meet the staircase is approximately 13 ft and where. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.

Stiffening the floor with 2x6 s will raise the frequency and 2x8 s will raise it even more but i don t know a way to calculate whether either one will raise the frequency enough get rid of the spongy feeling. The living room floor is over the garage and is supported by 2x10 joists with 16 spacing. The joists span approximately 11 ft one end is supported by a load bearing exterior wall the other end. I m trying to figure out whether this is a load bearing wall.

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.