Flat Roof Timber Joist Span

Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.

Flat roof timber joist span.

Two rows or more when the span exceeds 4 5m. Rafter and joist span faq. 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.

The section sizes are based on regularised als or cls timber. Usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size automatically calculate sizes suitable for supporting the loads below. Also available for the android os. 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.

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. If you want 6 joists you need a steel midway. Tables 1 and 2 in this chapter are derived from the trada technology ltd. Span calculator for wood joists and rafters also available for the android os.

For timber floors between homes. They also tell you what the maximum spacing should be between each section or timber member 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 05 2 67 3 22 3 77 4 31 4 85 assumptions at 400mm centers. One row when the span of the joists exceeds 2 5m. Span tables for solid timber joists.

Joists for that span would normally be around 9. Although i think you can get 6 metre joists in 6 x 2. The lengths and sizes of joists vary depending on the species and quality of the lumber used. You def cant put a joint in the timber.

Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Strutting should be either.