Flat Roof Joist Span Tables Uk

This table uses commonly available uk regularised timber depths.

Flat roof joist span tables uk.

The section sizes are based on regularised als or cls timber. Maximum slop3 10 deg. 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. At least 40mm bearing on supports.

Span tables for solid timber joists. Joist breadth 47mm. 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.

Tables 1 and 2 in this chapter are derived from the trada technology ltd. Other span tables are based on. 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. For pitched roofs flat roofs and ceiling joists.

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. For timber floors between homes. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Supporting imposed load for access and repair only.

Flat roof joists rafters purlin. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. Span is clear span between supports. 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.