4 22 inc vat per metre.
Flat roof joist sizes c16.
This span table is to the format and methodology given in bs 5268 7 2.
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.
Tables assume a minimum c16.
Span calculator for wood joists and rafters available for the iphone.
Fsc standard kiln dried regularised c16 treated carcassing 195 x 45mm.
3 0 3 6 4 2 4 8 5 4 6 0.
Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.
C16 easy edge c16 j joist.
C16 timber is commonly used in floor and roof joists for internal building work.
Fsc standard kiln dried regularised c16 treated carcassing 220 x 45mm.
Surveyors span tables for designing roof rafters.
Live load psf dead load psf span calculator for wood joists and rafters.
Sawn c16 and easy edge timber.
Timber is supplied in metric sizes.
400mm 450mm 600mm 97 x 47 1 84 1 81 1 74 122 x 47 2 43 2 38 2 27 147 x 47 3 08 3 02 2 87 170 x 47 3 74 3 67 3 46 195 x 47 4 41 4 31 4 07 220 x 47 5 08 4 96 4 67.
Size of joists mm 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 excluding self weight of joists up to 50kg m2.
Click on a span to generate a full calculation you can adjust the exact span.
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For pitched roofs flat roofs and ceiling joists.
It s often chosen as the standard timber for roof extensions or joist refurbishment as it s the most cost effective internal structural timber.
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 3 99.
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.
