Flat Roof Joist Span Chart

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

Flat roof joist span chart.

Roof rafter span use this table to determine the maximum lengths of roof rafters. Usually 400 450 or 600mm but any value can be used up to 610mm max. Use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support.

Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. This is the distance between joist centres. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Flat roof joist calculator.

This demo version is fixed at 1m clear span. Also available for the android os. The full version allows any size. 1 enter joist details 1 1 span and joist spacing.