Timber Roof Joist Span Tables

For pitched roofs flat roofs and ceiling joists.

Timber roof joist span tables.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. Also available for the android os. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

View size selection tables. Span tables for domestic floor joists to bs 5268 7 1 note. 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. View joist rafter tables.

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. Surveyors span tables for designing roof rafters. 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.

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. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. View allowable load tables. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1.

This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. 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.