Click here to download c16 span table leaflet c24 span table our premium grade of carcassing is c24 graded.
C24 flat roof joist span.
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.
Size of roof joists spacing of joists.
Timber floor joists shall be adequate for the spans and loads and be correctly installed.
C16 span table only stocked at our mitcham depot.
For pitched roofs flat roofs and ceiling joists.
Floor joist span tables for surveyors floor construction surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.
Joists under each partition.
These span tables apply only to flat roof and roof with a slope of up to 10 degrees.
Solid timber joist sizes are provided in the bs 8103 3 span tables.
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.
Surveyors span tables for designing roof rafters.
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 47 x 120 2 43 2 39 2 27 47 x 145 3 08 3 02 2 87 47 x 170 3 75 3 67 3 42 47 x 195 4 41 4 31 3 92 47 x 220 5 04 4 85 4 41 75 x 170 4 50 4 38.
Clear spans for flat roof joists in metres.
400mm 450mm 600mm 97 x 47 1 84 1 81 1 74 120 x 47 2 43 2 39 2 27 145 x 47 3 08 3 02 2 87 170 x 47 3 75 3 67 3 42 195 x 47 4 41 4 31 3 92 220 x 47 5 04 4 85 4 41 170 x 75 4 50 4.
Stocked at all branches click here to download c24 strength class pdf document.
Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.
Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5.
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.
