Flat Roof Joist Span Tables Uk

This table uses commonly available uk regularised timber depths.

Flat roof joist span tables uk. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. The section sizes are based on regularised als or cls timber. Span tables for solid timber joists. 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.

These span tables apply only to flat roof and roof with a slope of up to 10 degrees. 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. Flat roof joists rafters purlin. Supporting imposed load for access and repair only.

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. Surveyors span tables for designing roof rafters. Floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2. Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load.

Span is clear span between supports. Joist breadth 47mm. For timber floors between homes. Other span tables are based on.

Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. At least 40mm bearing on supports. Tables 1 and 2 in this chapter are derived from the trada technology ltd. Maximum slop3 10 deg.