Maximum Roof Span

Trusses with an asterisk that exceed 14 in height may be shipped in two pieces.

Maximum roof span. 1 ft 0 3048 m. 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. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. 1 psf lb f ft 2 47 88 n m 2.

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Live load 20 lbs ft 2 956 n m 2. Panels of corrugated metal roofing typically come in 6 foot lengths. 1 in 25 4 mm.

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Contact your localalpine trussmanufacturerorofficeformoreinformation. 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. When calculating how many panels you need remember that you have overlap the panels by 2 inches so a 6 foot length actually covers an area 5 foot 10 inches long.

Mono used where the roof is required to. To achieve maximum indicated spans trusses may require six or more panels. Live load is weight of furniture wind snow and more. 2 are indicated below.

So this table could accommodate a house with a total rafter span or house width of 32 feet. Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. Also available for the android os. 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.

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. 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. 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. Dead load weight of structure and fixed loads 15 lbs ft 2.