The lowest is a plain ceiling joist with no storage 10 pounds per square foot.
Floor joist span calculator.
Domestic floor joist calculator.
This is how far apart they will be.
Most lay outs are on 16 so the field is pre selected.
This is the distance between joist centres.
This demo version is fixed at 1m clear span.
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There are six choices.
Select the on center spacing for the joists.
The full version allows any size.
Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span.
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.
Usually 400 450 or 600mm but any value can be used up to 610mm max.
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.
Also available for the android os.
Calculations to bs 5268 2 2002.
Span calculator for wood joists and rafters also available for the android os.