Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Floor joist wood beam span calculator.
Span calculator for wood joists and rafters also available for the android os.
A 2 2x10 can span 10 feet and so on.
Dimensional lumber deck beam span chart.
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 resulting spans are less than the 2012 irc codes but they are to our standards at scott s framing.
Let s expand our house beyond that 17 2 span capability to 24 feet wide.
The spans for joists according to the code is far more than we find acceptable.
Designing with wood beam span tables.
So the house dimensions will now be 24 x 13.
A double 2x12 beam can span 12 feet.
Lumber species southern pine douglas fir douglas fir larch hemlock fir spruce pine fir redwood western cedar ponderosa pine red pine.
Calculate the span for floor and ceiling joist with this free and simple online calculator.
Beam span calculator for help simply click on the beside the section you need help with watch this tutorial video.
The widest span in the floor joist span table in part 2 of this tutorial module showed that floor joists can span 17 2 if they are 2 x 12s spaced 12 o c.
Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span.
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.
Floor joist span calculator.
Species southern pine douglas fir larch hem fir spruce pine fir redwood western cedars ponderosa pine red pine.
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.
Anything 5 and above we always at least double cripple.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
The numbers in gray indicate the distance between the support posts.
Beams of more than one ply must be fastened together with either nails or bolts.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
