Timber Pitched Roof Span Tables

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.

Timber pitched roof span tables.

Span calculator for wood joists and rafters also available for the android os. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

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. Surveyors span tables for designing roof rafters. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Pitched roof timber sizes.

Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. 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. View size selection tables. The figures are based on quality materials.

View allowable load tables. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. For pitched roofs flat roofs and ceiling joists. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.

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. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. View joist rafter tables. Span tables span tables can be used to determine the size of a timber member of a particular strength class required for a given span.

The tables below give maximum spans for rafters and beams. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. 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.