Timber Roof Joist Span Tables

View allowable load tables.

Timber roof joist span tables.

Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Surveyors span tables for designing roof rafters. 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. These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

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

Span calculator for wood joists and rafters also available for the android os. 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. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

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. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

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. Also available for the android os. Timber floor joists shall be adequate for the spans and loads and be correctly installed.