Timber Roof Joist Span Tables

Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders.

Timber roof joist span 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. For pitched roofs flat roofs and ceiling joists. Also available for the android os. View size selection tables.

These span tables apply only to flat roof and roof with a slope of up to 10 degrees. Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Span calculator for wood joists and rafters also available for the android os. View joist rafter 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. 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. View allowable load tables. Span tables for domestic floor joists to bs 5268 7 1 note.

Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. 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. Surveyors span tables for designing roof rafters.