Roof Joist Spacing Calculator

These spans were calculated using our flat roof joist calculation.

Roof joist spacing calculator.

The full version allows any size. 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. Span calculator for wood joists and rafters available for the iphone. This demo version is fixed at 1m clear span.

Spacing in exterior exposure. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. This is the distance between joist centres. Flat roof joist calculator.

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. 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 also available for. Span calculator for wood joists and rafters also available for the.

Spacing in live load psf dead load psf exterior exposure. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Usually 400 450 or 600mm but any value can be used up to 610mm max. Click on a span to generate a full calculation you can adjust the exact span.