Flat Roof Timber Joist Span

For timber floors between homes.

Flat roof timber joist span.

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 lengths and sizes of joists vary depending on the species and quality of the lumber used. Herringbone type timber 38mm x 38mm.

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. Strutting should be either. Also available for the android os. 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.

The section sizes are based on regularised als or cls timber. Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support. Joists for that span would normally be around 9. 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.

Span calculator for wood joists and rafters also available for the android os. Rafter and joist span faq. If you want 6 joists you need a steel midway. One row when the span of the joists exceeds 2 5m.

Two rows or more when the span exceeds 4 5m. You def cant put a joint in the timber. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. Span tables for solid timber joists.

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.