Usually 400 450 or 600mm but any value can be used up to 610mm max.
Roof joist spacing calculator.
Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.
This demo version is fixed at 1m clear span.
Spacing in exterior exposure.
The full version allows any size.
1 enter joist details 1 1 span and joist spacing.
Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.
Click on a span to generate a full calculation you can adjust the exact span.
Flat roof joist calculator.
Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
Span calculator for wood joists and rafters also available for the.
This span table is to the format and methodology given in bs 5268 7 2.
Span calculator for wood joists and rafters also available for.
Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.
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.
Span calculator for wood joists and rafters available for the iphone.
These spans were calculated using our flat roof joist calculation.