Span tables for solid timber joists.
Flat roof timber span tables c24.
For timber floors between homes.
N ote the spansgiven in pa rt4b ofsection4 forfloorjoists rafters purlins ceilingjoists bindersand roofjoistsareclearspans i e spansbetween the facesofthesupports.
Click here to download c16 span table leaflet c24 span table our premium grade of carcassing is c24 graded.
Stocked at all branches click here to download c24 strength class pdf document.
Supported wall a walltowhich lateralsupportisaffordedby a.
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.
Span tables flat roof joists 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.
Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.
Surveyors span tables for designing roof rafters.
Tables 1 and 2 in this chapter are derived from the trada technology ltd.
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.
For pitched roofs flat roofs and ceiling joists.
Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74.
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.
Clear span c16 joist m clear span c24 joist m 47 x 95 47 x 120 47 x 145 47 x 170 47 x 195 47 x 220 1 77 2 40 2 89 3 38 3 87 4 36 2 04 2 75 3 47 4 20 4 93 5 66 floor joists flat roof joists assumptions at 400mm centers supporting permanent load.
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.
Span tables span tables can be used to determine the size of a timber member of a particular.
Span the distance me asured along thecentreline ofa member between the centresofany twoadjacentbearingsorsupports.
The section sizes are based on regularised als or cls timber.
