Flat Roof Timber Joist Span

Rafter and joist span faq.

Flat roof timber joist span.

For timber floors between homes. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Although i think you can get 6 metre joists in 6 x 2. 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.

The section sizes are based on regularised als or cls timber. Span tables for solid timber joists. 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. Strutting should be either.

You def cant put a joint in the timber. Also available for the android os. If you want 6 joists you need a steel midway. The lengths and sizes of joists vary depending on the species and quality of the lumber used.

Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. This is the distance between joist centres. Tables 1 and 2 in this chapter are derived from the trada technology ltd. 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.

Span calculator for wood joists and rafters 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. Herringbone type timber 38mm x 38mm. These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

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. Two rows or more when the span exceeds 4 5m.