Required size for a given span.

Timber span tables flat roof. For pitched roofs flat roofs and ceiling joists. Other more complex load condition spans can be determined with our free hyne timber design 7 5 software. For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3. W awning frame width.

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. Surveyors span tables for designing roof rafters. Ro cb150 16 beam span table used w 3600 width of frame rafter span χ 6410 fascia beam span the cb150 16 beam achieves the 6000mm span for the fascia beam and can be used for the rafters. Span tables f7 rafters 30mm 11 f7 rafters 42mm 14 verandah beams f7 42mm sheet roof 17 verandah beams f7 42mm tile roof 20 verandah beams gl8 sheet roof 21 verandah beams gl8 tile roof 24 ridge beams f7 42mm sheet roof 25 ridge beams f7 42mm tile roof 28 internal floor joists f7 42mm 30.

Attached flat roof 1ao page14. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. 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.

Rafters can be omitted as they are not structural in the application. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs.

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