Maximum Floor Joist Span Calculator

View joist rafter tables.

Maximum floor joist span calculator.

Also available for the android os. Dead load weight of structure and fixed loads 10 lbs ft 2. 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. Select the on center spacing for the joists.

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. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. 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. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

The lowest is a plain ceiling joist with no storage 10 pounds per square foot. This is how far apart they will be. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 1 psf lb f ft 2 47 88 n m 2.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Live load is weight of furniture wind snow and more. 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. The highest is a fully loaded floor 70 pounds per square foot.

1 ft 0 3048 m. 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. Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span. There are six choices.

Species southern pine douglas fir larch hem fir spruce pine fir redwood western cedars ponderosa pine red pine. Maximum floor joist span for no. Most lay outs are on 16 so the field is pre selected.