Timber Roof Joist Span Tables

View allowable load tables.

Timber roof joist span tables.

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Solid timber joist sizes are provided in the bs 8103 3 span tables. For pitched roofs flat roofs and ceiling joists. 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 joist rafter tables. 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. Timber floor joists shall be adequate for the spans and loads and be correctly installed. Surveyors span tables for designing roof rafters.

Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. 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 calculator for wood joists and rafters also available for the android os.

Also available for the android os. View size selection tables. 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. 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.

Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.