Flat Roof Timber Joist Span

These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

Flat roof timber joist span.

Although i think you can get 6 metre joists in 6 x 2. This is the distance between joist centres. The section sizes are based on regularised als or cls timber. Span calculator for wood joists and rafters also available for the android os.

Joists for that span would normally be around 9. Tables 1 and 2 in this chapter are derived from the trada technology ltd. Strutting should be either. 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.

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. One row when the span of the joists exceeds 2 5m. 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. You def cant put a joint in the timber.

Span tables for solid timber joists. 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. Two rows or more when the span exceeds 4 5m.

Also available for the android os. Herringbone type timber 38mm x 38mm. 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. For timber floors between homes.

If you want 6 joists you need a steel midway. 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.