Timber Roof Beam Span Tables

For pitched roofs flat roofs and ceiling joists.

Timber roof beam span tables.

View size selection tables. Window door garage door headers supporting roof loads only. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. 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.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 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. Window door garage door headers supporting roof wall floor loads. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

For lesser grades spans should be shorter. View joist rafter tables. The tables below give maximum spans for rafters and beams. 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.

Also available for the android os. Span calculator for wood joists and rafters also available for the android os. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

View allowable load tables. Surveyors span tables for designing roof rafters. Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure.