Maximum Floor Joist Span Calculator

Most lay outs are on 16 so the field is pre selected.

Maximum floor joist span calculator. Other span tables are based on the guidance given in bs 5268 7 1 which is a uniformly distributed load of 1 5kn m for spans greater than. Floor joist span calculator to use the joist span calculator below first select the species of lumber you will use for your construction project from the drop down list. Live load is weight of furniture wind snow and more. Floor joist span tables for surveyors floor construction surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.

There are six choices. Dead load weight of structure and fixed loads 10 lbs ft 2. The lowest is a plain ceiling joist with no storage 10 pounds per square foot. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

This is how far apart they will be. Span calculator for wood joists and rafters also available for the android os. The floor joist span tables are based on the loadings given in the amended version of bs 6399 1 which is an imposed load of either a uniformly distributed load of 1 5 kn m or a concentrated load of 1 4 kn. Species southern pine douglas fir larch hem fir spruce pine fir redwood western cedars ponderosa pine red pine.

1 psf lb f ft 2 47 88 n m 2. 2 grade of douglas fir are indicated below. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

1 ft 0 3048 m. 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. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Select the on center spacing for the joists.

View joist rafter tables. Maximum floor joist span for no. The highest is a fully loaded floor 70 pounds per square foot.