Span calculator for wood joists and rafters also available for the android os.
Roof rafter span table.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Tables listing maximum spans for southern pine joists and rafters are detailed below.
Surveyors span tables for designing roof rafters.
The loads are based on adjusted roof snow loads from the governing building code.
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.
Span configuration and load conditions.
View joist rafter tables.
Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
Also available for the android os.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Rafter spans are tabulated for the most common roof loads.
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.
So this table could accommodate a house with a total rafter span or house width of 32 feet.
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.
Rafter spans for southern yellow pine douglas fir and eastern spruce.
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.
For each application a pdf download is available.
Click here for structural design calculations.
The shapes and spans shown here represent only a fraction of the millions of designs processed by alpine engineers.
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.
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.
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.
For pitched roofs flat roofs and ceiling joists.
