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.
Roof rafter span table.
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.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013.
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.
Rafter spans are tabulated for the most common roof loads.
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.
For pitched roofs flat roofs and ceiling joists.
Surveyors span tables for designing roof 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.
The shapes and spans shown here represent only a fraction of the millions of designs processed by alpine engineers.
So this table could accommodate a house with a total rafter span or house width of 32 feet.
Tables listing maximum spans for southern pine joists and rafters are detailed below.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Click here for structural design calculations.
Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.
For each application a pdf download is available.
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.
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 loads are based on adjusted roof snow loads from the governing building code.
View joist rafter tables.
Span calculator for wood joists and rafters also available for the android os.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Span configuration and load conditions.
