Load Capacity Of 2x8 Floor Joists

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Load capacity of 2x8 floor joists.

Our house has 2x10 joists under the 1st floor 2x8s under the 2nd and 2x6s under the 3rd all rough sized. 2 grade of douglas fir are indicated below. The living room floor is over the garage and is supported by 2x10 joists with 16 spacing. The span where the joists meet the staircase is approximately 13 ft and where.

Span calculator for wood joists and rafters also available for the android os. Floors must be able to support two different kinds of weight loads. 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. Dead load weight of structure and fixed loads 10 lbs ft 2 live load is weight of furniture wind snow and more.

I m trying to figure out whether this is a load bearing wall. Maximum floor joist span for no. The live load is the weight of furnishings people and anything else that the floor needs to support but which isn t permanently attached. 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.

The same wall runs perpendicular to the joists on all 3 floors but not the basement. 1 psf lb f ft 2 47 88 n m 2. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. 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.

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.