Maximum Roof Span

Live load is weight of furniture wind snow and more.

Maximum roof span.

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. Mono used where the roof is required to. Dead load weight of structure and fixed loads 15 lbs ft 2. 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.

Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. 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. 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. 1 psf lb f ft 2 47 88 n m 2. 1 ft 0 3048 m. Trusses with an asterisk that exceed 14 in height may be shipped in two pieces.

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. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Span calculator for wood joists and rafters also available for the android os. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

Panels of corrugated metal roofing typically come in 6 foot lengths. Also available for the android os. Live load 20 lbs ft 2 956 n m 2. To achieve maximum indicated spans trusses may require six or more panels.

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. So this table could accommodate a house with a total rafter span or house width of 32 feet. 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. 1 in 25 4 mm.