Flat Roof Rafters Span Tables

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.

Flat roof rafters span tables.

Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria. For pitched roofs flat roofs and ceiling joists. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Limited to span in inches divided by 360.

Therefore for gable roofed sheds the rafter span table is indicating how far a rafter can span half of your shed s width. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. 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. Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings.

If you have a single sloped roof then the 11 span distance for 2 4 rafters o c. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.

Also available for the android os. Deflection for 30 psf live load. The tables below give maximum spans for rafters and beams. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

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. Span calculator for wood joists and rafters also available for the android os. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Means that your shed should be no wider or longer depending on how you orientate your single sloped roof than 11.

Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value. Surveyors span tables for designing roof rafters.