Standard Roof Truss Lengths

To achieve maximum indicated spans trusses may require six or more panels.

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. Common or standard trusses are symmetrical and have standard four inch heels. 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. All truss images are for visual aid only and may not truly represent the roof truss supplied or designed by your chosen supplier.

Girder trusses are designed to carry additional loads other than standard roof loads. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. 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.

600 timber thickness mm. The average overhang for trusses used for housing or related buildings with a finished soffit is between 1 4 to 2. 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. Mono used where the roof is required to.

Pitch this is the incline of the roof expressed as a fraction. This length can easily be changed to fit the need of the truss. Essentially a roof truss is a prefabricated frame of supports designed to go on top of a building as it s being built. 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.

Post frame roof truss 23 residential end frame 1 residential roof truss 88 common 60. 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. Standard framing details for use in preliminary design. 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.

A truss with the same pitch and heel on both sides and a peak at the center is called a common truss. Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. 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.