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. 600 timber thickness mm. Contact your localalpine trussmanufacturerorofficeformoreinformation. Mono used where the roof is required to. Again this length can be adjusted to fit the need of the truss.

Standard framing details for use in preliminary design. Essentially a roof truss is a prefabricated frame of supports designed to go on top of a building as it s being built. 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. 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.

Girder trusses are designed to carry additional loads other than standard roof loads. Common or standard trusses are symmetrical and have standard four inch heels. The typical overhang for residential is between 16 inches and 24 inches. You can use sbca s span charts to roughly determine truss sizes available.

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. To achieve maximum indicated spans trusses may require six or more panels. A truss with the same pitch and heel on both sides and a peak at the center is called a common truss. Pitch this is the incline of the roof expressed as a fraction.

While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. Post frame roof truss 23 residential end frame 1 residential roof truss 88 common 60. 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. This length can easily be changed to fit the need of the truss.

Trusses with an asterisk that exceed 14 in height may be shipped in two pieces. Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs. Bt b tc 6 6 common truss configurations for the most widely designed roof shapes.