Flat Roof Joist Span C24

Flat roof joist calculator. 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. Span tables flat roof joists imposed load 0 75 kn m c24 timber permissible clear spans for flat roof joists to bs 5268 7 2 imposed load.

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