Maximum Floor Joist Span Calculator

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Maximum floor joist span calculator.

Maximum floor joist span for no. 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. Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span. Most lay outs are on 16 so the field is pre selected.

1 ft 0 3048 m. 2 grade of douglas fir are indicated below. View joist rafter tables. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Select the on center spacing for the joists. There are six choices. This is how far apart they will be. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

1 psf lb f ft 2 47 88 n m 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. 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. Also available for the android os.

Species southern pine douglas fir larch hem fir spruce pine fir redwood western cedars ponderosa pine red pine. 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. The highest is a fully loaded floor 70 pounds per square foot. The lowest is a plain ceiling joist with no storage 10 pounds per square foot.

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. 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.