Timber Roof Beam Span Tables

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.

Timber roof beam span tables.

Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure. View joist rafter tables. Also available for the android os.

For lesser grades spans should be shorter. 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. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

The tables below give maximum spans for rafters and beams. View allowable load tables. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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. For pitched roofs flat roofs and ceiling joists. Window door garage door headers supporting roof loads only. Surveyors span tables for designing roof rafters.

Span calculator for wood joists and rafters also available for the android os. Window door garage door headers supporting roof wall floor loads. 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.