Residential Roof Truss Design

 Roof trusses are an established structural design used to support buildings over a wide area of space. Trusses are made of wood, metal, concrete or a combination of these materials and have several main components such as joint angle, pole pieces, clevis rings and tiebacks. Often, timber roof trusses were used for hundreds of years to support roof and floor systems on commercial buildings. However, with changing building and construction techniques, truss designs have become increasingly less attractive to most building contractors due to the increased use of aluminum and steel.

For residential and light commercial structures, low-priced economical trusses can be selected using standard tongue-and-groove joinery method to avoid expensive framing materials. Low-priced roof trusses with standard tongue-and-groove joinery system usually include four clevis rings with two on each end and one crossbrace. Common types of timber trusses used in residential and light commercial structures include flat and sloping roof trusses and arched and convex roofs. Typically, arched roof truss is the more popular design type due to its ability to expand along the pitch direction.

The roof truss design is also very important for the structural stability of the building as it provides lateral, longitudinal and axial load bearing capabilities to the structure. Usually the maximum load-bearing design strength of residential construction is obtained with single-link timber trusses. This type of construction is found to be more reliable, long lasting and versatile than double-linked truss systems. Moreover, residential construction is not subjected to the harsh weather conditions like climatic, weathering, pressure and wind forces. Thus, more building owners and developers prefer to utilize this type of roof truss design in residential buildings.

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