Timber Roof Span Tables Uk

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Timber roof span tables uk.

Tables 1 and 2 in this chapter are derived from the trada technology ltd. 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. Pitched roof timber sizes.

Surveyors span tables for designing roof rafters. 15 or more but less than 22 5. Span tables for solid timber joists. 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. Span table 0 75 kn m. 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. 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. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. For timber floors between homes. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.

The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Span tables for rafters to bs 5268 7 5 imposed loads of 0 75 kn m snow load are applicable to most areas where the altitude does not exceed. These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

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. Ceiling joists flat roof joists rafters purlin span tables rafters.