Maximum Roof Span

1 in 25 4 mm.

Maximum roof span.

Trusses with an asterisk that exceed 14 in height may be shipped in two pieces. 1 psf lb f ft 2 47 88 n m 2. 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. 2 are indicated below.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Live load is weight of furniture wind snow and more. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

You can order sheets cut to specific lengths ranging from 5 to 45 feet long although it is difficult to handle a panel longer than 16 feet. So this table could accommodate a house with a total rafter span or house width of 32 feet. 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. To achieve maximum indicated spans trusses may require six or more panels.

Span calculator for wood joists and rafters also available for the android os. 1 ft 0 3048 m. Contact your localalpine trussmanufacturerorofficeformoreinformation. 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.

A 2x12 with an e of 800 000 psi and fb of 790 psi also works since it can span 15 feet and 10 inches. Mono used where the roof is required to. Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. Dead load weight of structure and fixed loads 15 lbs ft 2.

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. As the table shows no 2x8 s meet the span and spacing requirements but a 2x10 with an e of 1 300 000 psi and fb of 1093 psi can span 15 feet 3 inches more than enough. Panels of corrugated metal roofing typically come in 6 foot lengths.