Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Floor joist span calculator canada.
Also available for the android os.
There are six choices.
Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span.
This calculator matches up with 90 of the applications in the 2012 international residential code book.
1 web stiffeners are required at intermediate supports of continuous span joists when the intermediate bearing length is less than 5 and the span on either side of the intermedi ate bearing is greater than the following spans.
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.
This is how far apart they will be.
Select the on center spacing for the joists.
If there is are any questions about anything else then you should contact your supplier or an engineer.
Span calculator for wood joists and rafters also available for the android os.
Bold italic spans indicate floors that would meet national building code of canada nbcc.
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.
Floor joist span tables for various sizes and species of wood.
Most lay outs are on 16 so the field is pre selected.
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Species southern pine douglas fir larch hem fir spruce pine fir redwood western cedars ponderosa pine red pine.
It has been my experience to never use a beam smaller than a two ply 2 x 8.
