Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
Roof joist spacing calculator.
Span calculator for wood joists and rafters also available for.
These spans were calculated using our flat roof joist calculation.
Spacing in live load psf dead load psf exterior exposure.
Flat roof joist calculator.
Usually 400 450 or 600mm but any value can be used up to 610mm max.
The full version allows any size.
Spacing in exterior exposure.
Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof.
Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.
Span calculator for wood joists and rafters available for the iphone.
This is the distance between joist centres.
Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.
1 enter joist details 1 1 span and joist spacing.
Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.
Click on a span to generate a full calculation you can adjust the exact span.
This demo version is fixed at 1m clear span.