Flat Roof Joist Spans Uk

This span table is to the format and methodology given in bs 5268 7 2.

Flat roof joist spans uk.

Rafter and joist span faq. Surveyors span tables for designing roof rafters. 1 enter joist details 1 1 span and joist spacing. 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.

Usually 400 450 or 600mm but. Tables 1 and 2 in this chapter are derived from the trada technology ltd. Should refer to trada document span tables for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice. 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.

If supporting lightweight partitions running parallel to joists provide two additional joists under each partition. These spans were calculated using our flat roof joist calculation engine. Also available for the android os. These span tables are the equivalent of other industry standard span tables and are calculated to the same standards.

Flat roof joist calculator. This table uses commonly available uk regularised timber depths. Span tables for solid timber joists. Span calculator for wood joists and rafters also available for the android os.

Suitable for uk building regulation approval. This is the distance between joist centres. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. 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.

For timber floors between homes. 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. The full version allows any size. 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.

Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. The section sizes are based on regularised als or cls timber.