Standard Roof Truss Lengths

Included are a series of representative roof truss span tables that will give you an idea of the truss spans available for a particular load condition load duration lumber type and truss configuration.

Standard roof truss lengths.

Pitch this is the incline of the roof expressed as a fraction. A truss with the same pitch and heel on both sides and a peak at the center is called a common truss. The typical overhang for residential is between 16 inches and 24 inches. Post frame roof truss 23 residential end frame 1 residential roof truss 88 common 60.

Mono used where the roof is required to. Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5 9 72 tr26 wb 4 8 4 9 72 tr26. Again this length can be adjusted to fit the need of the truss. If the overhang is more than around 2 6 it will require a 2 6 top cord for the tail section to handle that amount.

While pitch and slope are used interchangeably they are not the same span also known as gable width this is based on the total footprint of the house and refers to the distance between two exterior. 600 timber thickness mm. To achieve maximum indicated spans trusses may require six or more panels. If the overhang extends beyond 24 inches say to 30 inches then a 2 6 top chord for the tail section will be required to handle the additional overhang.

Essentially a roof truss is a prefabricated frame of supports designed to go on top of a building as it s being built. Contact your localalpine trussmanufacturerorofficeformoreinformation. You can use sbca s span charts to roughly determine truss sizes available. The average overhang for trusses used for housing or related buildings with a finished soffit is between 1 4 to 2.

Easily attached to the rest of the building s frame they circumvent the complicated expensive nature of from scratch roof framing and can be purchased in a wide variety of designs made from either lumber commonly used for homes or metal primarily used for commercial. Trusses with an asterisk that exceed 14 in height may be shipped in two pieces. All truss images are for visual aid only and may not truly represent the roof truss supplied or designed by your chosen supplier. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.

Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. This length can easily be changed to fit the need of the truss. Standard framing details for use in preliminary design.