Floor Joist Load Rating Calculator

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.

Floor joist load rating calculator. True floor joist span calculations can only be made by a structural engineer or contractor. Span calculator for wood joists and rafters also. This is how far apart they will be. Span calculator for wood joists and rafters also available for the android os.

Most lay outs are on 16 so the field is pre selected. Live load psf dead load psf exterior exposure. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. Maximum floor joist span for no.

Use span tables for progressively heavier loads until you find the limits of your floor. 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. There are six choices. The lowest is a plain ceiling joist with no storage 10 pounds per square foot.

Location and configuration of heavy loads should be looked at on a case by case basis. 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. Span calculator for wood joists and rafters available for the iphone. While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator.

Species southern pine douglas fir larch hem fir spruce pine fir redwood western cedars ponderosa pine red pine. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Live load is weight of furniture wind snow and more. A uniform load rating on a beam can easily be translated into what an equivalent maximum point load can be.

2 grade of douglas fir are indicated below. 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. Select the on center spacing for the joists. The highest is a fully loaded floor 70 pounds per square foot.

Dead load weight of structure and fixed loads 10 lbs ft2.