Flat Roof Roof Joist Span Calculator Uk

This demo version is fixed at 1m clear span.

Flat roof roof joist span calculator uk. Also available for the android os. Joists under each partition. Usually 400 450 or 600mm but. The full version allows any size.

This is the distance between joist centres. 1 enter joist details 1 1 span and joist spacing. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 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.

These spans were calculated using our flat roof joist calculation engine. 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. Surveyors span tables for designing roof rafters. This span table is to the format and methodology given in bs 5268 7 2.

Span calculator for wood joists and rafters 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. Flat roof joist calculator. Click on a span to generate a full calculation you can adjust the exact span.

These span tables are the equivalent of other industry standard span tables and are calculated to the same standards. Suitable for uk building regulation approval.