Floor Joist Load Rating Calculator

Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

Floor joist load rating calculator.

The highest is a fully loaded floor 70 pounds per square foot. Dead load weight of structure and fixed loads 10 lbs ft2. Maximum floor joist span for no. A uniform load rating on a beam can easily be translated into what an equivalent maximum point load can be.

Use the joist span and spacing calculator below to plug in your desired type of wood the size of your joists and the required spacing between each joist. 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. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction. In this case your joists are adequate to support a 30 psf live load and 10 psf dead load.

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. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. Location and configuration of heavy loads should be looked at on a case by case basis. Most lay outs are on 16 so the field is pre selected.

Use span tables for progressively heavier loads until you find the limits of your floor. Span calculator for wood joists and rafters available for the iphone. 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. Span calculator for wood joists and rafters also.

True floor joist span calculations can only be made by a structural engineer or contractor. The lowest is a plain ceiling joist with no storage 10 pounds per square foot. Live load psf dead load psf exterior exposure. Span calculator for wood joists and rafters also available for the android os.

Live load is weight of furniture wind snow and more. 1 psf lbf ft2 47 88 n m2. There are six choices. Select the on center spacing for the joists.

2 grade of douglas fir are indicated below.