Floor Joist Load Rating

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

Floor joist load rating. Unlike stiffness live loads and dead loads are added together to determine minimum design values for strength. 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. Structural track usually in the same gauge as the. Live load is weight of furniture wind snow and more.

Provide a lightweight low cost rigid floor assembly c joist components provide an economical lightweight alternative to open web trusses bar joists engineered lumber cast in place or hollow core floor assemblies. To determine the dead load value for a given floor or roof system the weight of all permanently installed materials in a given component are added together. Span calculator for wood joists and rafters also available for the android os. Depending on loads and spans c joists are typically spaced at 12 16 19 2 or 24 on center spacing.

Location and configuration of heavy loads should be looked at on a case by case basis. But larger is not always better when builders are constructing a home or adding a room addition. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. Maximum floor joist span for no.

Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720 this performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span. The span table for a 30 psf live load 10psf dead load floor indicates a required fb value of 1 315 and a minimum e value of 1 800 000. In this case your joists are adequate to support a 30 psf live load and 10 psf dead load. 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.

In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches. 1 ft 0 3048 m. Joists and rafters must be strong enough not to break when loaded. A uniform load rating on a beam can easily be translated into what an equivalent maximum point load can be.

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. 1 psf lb f ft 2 47 88 n m 2. 2 grade of douglas fir are indicated below. Dead load weight of structure and fixed loads 10 lbs ft 2.