Maximum Span Of Roof Trusses In Ft

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

Maximum span of roof trusses in ft.

1 ft 0 3048 m. Live load is weight of furniture wind snow and more. Trusses with an asterisk that exceed 14 in height may be shipped in two pieces. The heaviest joist along with the above factors will span a maximum of 23 feet 8 inches.

2 are indicated below. To achieve maximum indicated spans trusses may require six or more panels. 1 psf lb f ft 2 47 88 n m 2. 1 in 25 4 mm.

Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. This is the most common as the typical span is 15 feet. Dead load weight of structure and fixed loads 15 lbs ft 2. So the space between rafters can be greater without reducing the maximum span.

Contact your localalpine trussmanufacturerorofficeformoreinformation. Bear in mind that this span chart shows the absolute maximum span for a truss with no hvac. The same concept holds true for roof trusses. For example an 8 10 metre span for a timber truss is quite a long one and can lead to problems.

Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet. Below is a chart that we use for quick reference to match floor truss height and spacing with any given span. Span calculator for wood joists and rafters also available for the android os. Also available for the android os.

Live load 20 lbs ft 2 956 n m 2. The size of a timber truss is an important part of designing a building and while there are no set maximum sizes there are some best practices.