Flat Roof Roof Joist Span Calculator Uk

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.

Flat roof roof joist span calculator uk.

This span table is to the format and methodology given in bs 5268 7 2. Also available for the android os. 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. 1 enter joist details 1 1 span and joist spacing.

Usually 400 450 or 600mm but. These spans were calculated using our flat roof joist calculation engine. Surveyors span tables for designing roof rafters. Span calculator for wood joists and rafters also available for the android os.

Click on a span to generate a full calculation you can adjust the exact span. This is the distance between joist centres. This demo version is fixed at 1m clear span. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. For pitched roofs flat roofs and ceiling joists. Suitable for uk building regulation approval. These span tables are the equivalent of other industry standard span tables and are calculated to the same standards.

The full version allows any size. Other span tables are based on the guidance given in bs 5268 7 1 which is a uniformly distributed load of 1 5kn m for spans greater than 2400 mm and 3 6 kn load per metre width of floor for spans less than 2400 mm to ensure that very small joist sizes do not result from the calculations for smaller spans.