Standard Roof Truss Lengths

Essentially a roof truss is a prefabricated frame of supports designed to go on top of a building as it s being built.

Standard roof truss lengths.

Trusses with an asterisk that exceed 14 in height may be shipped in two pieces. 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. 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.

A truss with the same pitch and heel on both sides and a peak at the center is called a common truss. Girder trusses are designed to carry additional loads other than standard roof loads. 600 timber thickness mm. You can use sbca s span charts to roughly determine truss sizes available.

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. All truss images are for visual aid only and may not truly represent the roof truss supplied or designed by your chosen supplier. 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. The average overhang for trusses used for housing or related buildings with a finished soffit is between 1 4 to 2.

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. The typical overhang for residential is between 16 inches and 24 inches. Again this length can be adjusted to fit the need of the truss. Common or standard trusses are symmetrical and have standard four inch heels.

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. This length can easily be changed to fit the need of the truss. Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. To achieve maximum indicated spans trusses may require six or more panels.

Pitch this is the incline of the roof expressed as a fraction. Mono used where the roof is required to. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.