Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
Lumber span tables 2x4 flat roof rafters.
View joist rafter tables.
Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
1 ft 0 3048 m.
Also available for the android os.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
For heavy loads 2x4s can span up to 5.
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.
Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Dead load weight of structure and fixed loads 15 lbs ft 2.
1 psf lb f ft 2 47 88 n m 2.
Limited to span in inches divided by 360.
Permitted for intermediate spans and design values.
Span calculator for wood joists and rafters also available for the android os.
For light load roofs 24 o c.
Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.
2 are indicated below.
2 4 rafters can span up to 7.
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.
While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator.
Lumber design values use of these span tables requires reference to the applicable design values for the various species and grades of lumber.
Deflection for 30 psf live load.
Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center.
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.
