Flat Roof Timber Joist Span

The lengths and sizes of joists vary depending on the species and quality of the lumber used.

Flat roof timber joist span.

This is the distance between joist centres. Strutting should be either. The section sizes are based on regularised als or cls timber. Tables 1 and 2 in this chapter are derived from the trada technology ltd.

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. Span calculator for wood joists and rafters also available for the android os. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. Span tables for solid timber joists.

For timber floors between homes. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Herringbone type timber 38mm x 38mm. Also available for the android os.

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. Two rows or more when the span exceeds 4 5m. 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. Although i think you can get 6 metre joists in 6 x 2.

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. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. Rafter and joist span faq. You def cant put a joint in the timber.

One row when the span of the joists exceeds 2 5m. Joists for that span would normally be around 9.