Flat Roof Joist Span Table Uk

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

Flat roof joist span table uk.

Joist breadth 47mm. Maximum slop3 10 deg. Span tables for solid timber 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.

For pitched roofs flat roofs and ceiling joists. At least 40mm bearing on supports. Flat roof joists rafters purlin. C16 span table only stocked at our mitcham depot.

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 imposed loads of 1 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 exceeds 100 metres but does not exceed 200 metres. For timber floors between homes. Tables 1 and 2 in this chapter are derived from the trada technology ltd. Supporting imposed load for access and repair only.

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. Floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2. Stocked at all branches click here to download c24 strength class pdf document. This table uses commonly available uk regularised timber depths.

The section sizes are based on regularised als or cls timber. The floor joist span tables are based on the loadings given in the amended version of bs 6399 1 which is an imposed load of either a uniformly distributed load of 1 5 kn m or a concentrated load of 1 4 kn. Span is clear span between supports. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.

Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. Surveyors span tables for designing roof rafters. 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.