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.
Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.
At least 40mm bearing on supports.
Other span tables are based on.
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.
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.
These span tables apply only to flat roof and roof with a slope of up to 10 degrees.
Span tables for solid timber 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.
Joist breadth 47mm.
Tables 1 and 2 in this chapter are derived from the trada technology ltd.
For timber floors between homes.
Span is clear span between supports.
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.
Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.
For pitched roofs flat roofs and ceiling joists.
Supporting imposed load for access and repair only.
Surveyors span tables for designing roof rafters.
Maximum slop3 10 deg.