For pitched roofs flat roofs and ceiling joists.
Flat roof joist span table uk.
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.
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.
Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.
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.
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.
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.
C16 span table only stocked at our mitcham depot.
Tables 1 and 2 in this chapter are derived from the trada technology ltd.
Stocked at all branches click here to download c24 strength class pdf document.
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.
Other span tables are based on.
Span tables for solid timber joists.
This table uses commonly available uk regularised timber depths.
At least 40mm bearing on supports.
Flat roof joists rafters purlin.
Supporting imposed load for access and repair only.
Surveyors span tables for designing roof rafters.
Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.
Maximum slop3 10 deg.
Span is clear span between supports.
Click here to download c16 span table leaflet c24 span table our premium grade of carcassing is c24 graded.
