Roof Rafter Span Table

Rafter spans for southern yellow pine douglas fir and eastern spruce.

Roof rafter span table.

For pitched roofs flat roofs and ceiling joists. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 1 15 30 snow shingle 40 1 15 20 snow shingle 40 1 25 20 shingle construction or. Surveyors span tables for designing roof rafters.

View joist rafter tables. For roof live loads less than 20 pounds per square foot psf rafter spans and required e values tabulated for 20 psf shall be permitted to be adjusted in accordance with the fol lowing table. Span configuration and load conditions. Click here for structural design calculations.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. 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. The shapes and spans shown here represent only a fraction of the millions of designs processed by alpine engineers. These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. The loads are based on adjusted roof snow loads from the governing building code. Tables listing maximum spans for southern pine joists and rafters are detailed below. So this table could accommodate a house with a total rafter span or house width of 32 feet.

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. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Span calculator for wood joists and rafters also available for the android os. For each application a pdf download is available.

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter. Also available for the android os.