Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Roof rafter span table.
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 pitched roofs flat roofs and ceiling joists.
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.
Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
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.
Span calculator for wood joists and rafters also available for the android os.
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.
Tables listing maximum spans for southern pine joists and rafters are detailed below.
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.
Surveyors span tables for designing roof rafters.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
The loads are based on adjusted roof snow loads from the governing building code.
Also available for the android os.
For each application a pdf download is available.
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.
Rafter spans for southern yellow pine douglas fir and eastern spruce.
View joist rafter tables.
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.
Span configuration and load conditions.
These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013.
Click here for structural design calculations.
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.
