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.

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. Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. For lesser grades spans should be shorter. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders.

Also available for the android os. View allowable load tables. The tables below give maximum spans for rafters and beams. View size selection tables.

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. The figures are based on quality materials. For pitched roofs flat roofs and ceiling joists.

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