Flat Roof Timber Joist Span

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.

Flat roof timber joist span.

Span tables for solid timber joists. 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. Tables 1 and 2 in this chapter are derived from the trada technology ltd.

Strutting should be either. For timber floors between homes. 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. These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

The section sizes are based on regularised als or cls timber. One row when the span of the joists exceeds 2 5m. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Span calculator for wood joists and rafters also available for the android os.

This is the distance between joist centres. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. 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. The lengths and sizes of joists vary depending on the species and quality of the lumber used.

If you want 6 joists you need a steel midway. Rafter and joist span faq. Two rows or more when the span exceeds 4 5m. Also available for the android os.

Joists for that span would normally be around 9. 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.