Timber Roof Beam Span Tables

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Timber roof beam span tables.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Window door garage door headers supporting roof wall floor loads. 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.

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. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. For lesser grades spans should be shorter. View size selection 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. Also available for the android os. Window door garage door headers supporting roof loads only. For pitched roofs flat roofs and ceiling joists.

The tables below give maximum spans for rafters and beams. Span calculator for wood joists and rafters also available for the android os. View joist rafter tables. Surveyors span tables for designing roof rafters.

Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. These span tables apply only to flat roof and roof with a slope of up to 10 degrees.