Flat Roof Joist Span Chart

1 enter joist details 1 1 span and joist spacing.

Flat roof joist span chart.

The full version allows any 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. Span calculator for wood joists and rafters also available for the android os. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

Usually 400 450 or 600mm but any value can be used up to 610mm max. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. This demo version is fixed at 1m clear span.

Spans and required e values tabulated for 20 psf shall be permitted to be adjusted in accordance with the fol lowing table. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. 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 rafter span use this table to determine the maximum lengths of roof rafters.

Use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Flat roof joist calculator.