Load Bearing Capacity Floor Joists

Floor joist capacity max working load 2 0 kn m 2.

Load bearing capacity floor joists.

Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. This number tells you the total load capacity of your floor. The joists span approximately 11 ft one end is supported by a load bearing exterior wall the other end of the joists rest on a 4x10 beam that spans the width of my garage. 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.

If the example floor is 6 by 9 metres 20 by 30 feet the total area is 54 square metres 600 square feet. 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. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. With an evenly distributed live load of 30 psf which the tables show the floor is able to support the total weight on the floor would be about 3 360 pounds.

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. 1 ft 0 3048 m. But larger is not always better when builders are constructing a home or adding a room addition. For example a floor joist at 16 spacing s that can carry 53 pounds per linear foot would translate into a 318 pound single point load at its center.

A uniform load rating on a beam can easily be translated into what an equivalent maximum point load can be. Floor joist capacity max working load 3 0 kn m 2 as pdf file. Any help is greatly. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

Brace and nail each power joist as it is installed using hangers bloc king panels rim board and or cross bridging at joist ends. 2 grade of douglas fir are indicated below. Carry any load until fully braced and sheathed. Joist spacing in metres x span in metres.

Dead load weight of structure and fixed loads 10 lbs ft 2. 54 x 269 14 526 kg 32 024 lb. Maximum floor joist span for no. 1 psf lb f ft 2 47 88 n m 2.

Calculate the total area supported by one joist according to this formula. Live load is weight of furniture wind snow and more. Oid ccidents y ollowing ese ortant guidelines. Increasing the total weight on the floor to 4 480 pounds however results in a live load of 40 psf which is beyond the floor s load capacity.