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.

Timber roof joist 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 to be covered these span tables do not apply to timber which is fully exposed to the elements. View allowable load tables. View size selection tables.

Span calculator for wood joists and rafters also available for the android os. Also available for the android os. 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.

Solid timber joist sizes are provided in the bs 8103 3 span tables. View joist rafter tables. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders.

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. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. 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.

For pitched roofs flat roofs and ceiling joists.