Flat Roof Timber Span Tables

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.

Flat roof timber 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. They also tell you what the maximum spacing should be between each section or timber member. For pitched roofs flat roofs and ceiling joists. 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.

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