Floor Joist Load Limits

Drywall attached to the underside of this system is not expected to crack when the floor joist system deflects 1 3.

Floor joist load limits.

Span calculator for wood joists and rafters also available for the android os. If you are using 3 4 inch sturd i floor plywood however that. In choosing between oriented strandboard and plywood the building and construction technology department at the university of massachusetts amherst explains that 7 16 inch osb and inch plywood weigh in at 46 and 48 pounds respectively so they are quite similar. Use span tables for progressively heavier loads until you find the limits of your floor.

Trus joist tji joist specifier s guide tj 4000 july 2019. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. 1 ft 0 3048 m. 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 this example the table for a 40 psf live load 10 psf dead load floor shows that the joist in the example have a required fb value of 1 644 and an e value of at least 2 400 000. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Live load is weight of furniture wind snow and more. Floor joist span tables for various sizes and species of wood.

2 grade of douglas fir are indicated below. Fire safe construction 3 floor performance and tj pro rating 4 5 section 1. These limits are based on live loads and activities experienced in specific rooms of a house. Osb weight is usually a bit less than its plywood counterpart.

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. But larger is not always better when builders are constructing a home or adding a room addition. 9 16 tji joists design properties 6 floor span and load tables 7 8 tips for preventing floor noise 8 allowable holes 9 cantilevers 10 11 roof span and load tables 12 13 framing. 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. Maximum floor joist span for no. Typical deflection limits referenced in code books are l 360 l 240 or l 180. A uniform load rating on a beam can easily be translated into what an equivalent maximum point load can be.