Flat Roof Roof Joist Span Calculator Uk

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.

Flat roof roof joist span calculator uk.

Surveyors span tables for designing roof rafters. Suitable for uk building regulation approval. The full version allows any size. Also available for the android os.

This is the distance between joist centres. Flat roof joist calculator. Click on a span to generate a full calculation you can adjust the exact span. For pitched roofs flat roofs and ceiling joists.

This demo version is fixed at 1m clear span. 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. 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. This span table is to the format and methodology given in bs 5268 7 2.

1 enter joist details 1 1 span and joist spacing. Joists under each partition. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Span calculator for wood joists and rafters also available for the android os. These spans were calculated using our flat roof joist calculation engine.