Flat Roof Timber Span Tables Uk

These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

Flat roof timber span tables uk.

Should refer to trada document span tables for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice. For example a 5 12 2 12 combination has approx. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the.

Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74. Span tables for solid timber joists. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. Tables 1 and 2 in this chapter are derived from the trada technology ltd.

Surveyors span tables for designing roof rafters. The section sizes are based on regularised als or cls timber. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. For pitched roofs flat roofs and ceiling joists.

Span tables flat roof 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. 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. 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.

Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. For timber floors between homes. 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. The same allowable span as a 6 12 3 12.