Timber Roof Beam Span Tables

Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure.

Timber roof beam span tables.

Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. 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. 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. Window door garage door headers supporting roof loads only. 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. For pitched roofs flat roofs and ceiling joists.

View size selection tables. Span calculator for wood joists and rafters also available for the android os. The tables below give maximum spans for rafters and beams. These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

Surveyors span tables for designing roof rafters. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 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. For lesser grades spans should be shorter.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. View joist rafter tables. View allowable load tables.