Span calculator for wood joists and rafters also available for the android os.
Floor joist cantilever calculator.
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.
The distance your joists can safely cantilever or overhang a drop beam is determined by the size of the joists the wood type and grade of the lumber and the spacing between joists.
The highest is a fully loaded floor 70 pounds per square foot.
Select the on center spacing for the joists.
Floor joist span calculator.
Floor cantilever spans shall not exceed the nominal depth of the wood floor joist.
Home joist span calculator.
Species southern pine douglas fir larch hem fir spruce pine fir redwood western cedars ponderosa pine red pine.
Many building departments limit joist cantilevers to 24 maximum.
Floor cantilevers constructed in accordance with table r502 3 3 1 shall be permitted where supporting a light frame bearing wall and roof only.
There are six choices.
Floor cantilevers supporting an exterior balcony are permitted to be constructed in accordance with table r502 3 3 2.
For help simply click on the beside the section you need help with or watch this tutorial video.
The lowest is a plain ceiling joist with no storage 10 pounds per square foot.
Home joist span.
Also available for the android os.
On center joist spacing 12 16 24 overhang.
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.
Joist size 2x8 2x10 2x12.
Most lay outs are on 16 so the field is pre selected.