Timber Roof Beam Span Tables

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.

Timber roof beam span tables.

Window door garage door headers supporting roof loads only. View size selection tables. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. For lesser grades spans should be shorter.

Span calculator for wood joists and rafters also available for the android os. Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications. Surveyors span tables for designing roof rafters. These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure. Also available for the android os. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. View joist rafter tables. View allowable load tables. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.

The figures are based on quality materials. Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings. The tables below give maximum spans for rafters and beams.