Flat Roof Joist Span Tables Uk

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.

Flat roof joist span tables uk.

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. Ws200 easi joist joist depth. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.

For timber floors between homes. For pitched roofs flat roofs and ceiling joists. 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.

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. Maximum slop3 10 deg. Joist breadth 47mm. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.

The dead loads shown at the top of span table above do not include the self weight of the joists however the joist self weights are included in addition to the dead loads in the calculations used to determine permissble clear spans. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. 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.

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. Span is clear span between supports. Tables 1 and 2 in this chapter are derived from the trada technology ltd.