Timber Roof Joist Span Tables

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Timber roof joist span tables.

These span tables apply only to flat roof and roof with a slope of up to 10 degrees. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. They also tell you what the maximum spacing should be between each section or timber member size of joists mm clear span c16 joist m clear span c24 joist m 47 x 95 47 x 120 47 x 145 47 x 170 47 x 195 47 x. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders.

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. View joist rafter tables. Span tables span tables can be used to determine the size of a timber member of a particular strength class required for a given span. 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.

Span tables for domestic floor joists to bs 5268 7 1 note. Surveyors span tables for designing roof rafters. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. View size selection tables.

Span calculator for wood joists and rafters also available for the android os. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. 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.

Solid timber joist sizes are provided in the bs 8103 3 span tables. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. Timber floor joists shall be adequate for the spans and loads and be correctly installed.