Floor Span Calculator

To use the beam span calculator below first select the number of floors that the floor beam will be supporting from the drop down list.

Floor span calculator. 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. Floor truss span chart each individual floor truss design is unique based on multiple variables. Also available for the android os.

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. 2 grade of douglas fir are indicated below.

1 psf lb f ft 2 47 88 n m 2. Tcll 40 psf tcll 80 psf tcll 125 psf truss spacing truss spacing truss spacing. Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span.

Also available for the android os. Span calculator for wood joists and rafters also available for the android os. The resulting spans are less than the 2012 irc codes but they are to our standards at scott s framing.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. The spans for joists according to the code is far more than we find acceptable. Next use the buttons to select the supported length for the beam.

In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches. 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. Next consult a span table to cross reference the spacing and span to find the required fb value for that table s load limits.