Flat Roof Joist Spans Uk

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.

Flat roof joist spans uk.

This demo version is fixed at 1m clear span. Also available for the android os. Tables 1 and 2 in this chapter are derived from the trada technology ltd. This span table is to the format and methodology given in bs 5268 7 2.

Flat roof joist calculator. The section sizes are based on regularised als or cls timber. 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. 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.

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. If supporting lightweight partitions running parallel to joists provide two additional joists under each partition. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. Usually 400 450 or 600mm but.

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 is the distance between joist centres. For timber floors between homes.

Span tables for solid timber joists. The full version allows any size. Span calculator for wood joists and rafters 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.

The lengths and sizes of joists vary depending on the species and quality of the lumber used. For pitched roofs flat roofs and ceiling joists. 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. Suitable for uk building regulation approval.

This table uses commonly available uk regularised timber depths. Surveyors span tables for designing roof rafters.