Maximum Floor Joist Span Calculator

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Maximum floor joist span calculator.

Select the on center spacing for the joists. Most lay outs are on 16 so the field is pre selected. The lowest is a plain ceiling joist with no storage 10 pounds per square foot. 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. View joist rafter tables. 1 psf lb f ft 2 47 88 n m 2. 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.

2 grade of douglas fir are indicated below. Span calculator for wood joists and rafters also available for the android os. This is how far apart they will be. 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 ft 0 3048 m. Maximum floor joist span for no. The highest is a fully loaded floor 70 pounds per square foot.

Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span. 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. Dead load weight of structure and fixed loads 10 lbs ft 2. 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.

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