If you see those triangles that support roof load, they are called roof trusses. Each member of those triangles is created under compression and tension yet they do not bend. They are primarily characterized by a combination of individual lightweight pieces that make them capable of providing greater benefits in transport and assembly in comparison to other conventional roof structures. Conversely, however, they are labor-intensive and need connection devices to be installed.
Fortunately, most trusses can be pre-fabricated and engineered for them to be ready for installation upon arrival at the site. The height of the truss is typically bigger than the height of related structures that have solid beams. However, for the roofs, they need to be higher at the ridge and lower at the eaves to give way to proper roof drainage and water tightness.
Competitors of Roof Truss
Though the use of steel for building roof structures has nearly demanded a truss, it is the use of wood structures that roof trusses have strong competitors. The most common ones include the purlin and the rafter roofs.
The purlin roof. This kind of roof contains both purlins and rafters. It has a ridge purlin that is supported by the posts while the rafters act as supported beams between the purlins. This support goes with or without a cantilever.
The rafter roof. This roof is inspired by tent construction with two rafters and a tie beam, forming the triangle. With this design, it looks very much the same as the basic design of the truss. The stiffness of the rafter can be improved using a collar beam near the ridge. Finally, the rafters can also rest on a concrete slab, which then replaces the tie beam.
If you want to learn more about each of these roof structures, you can dial us and talk to one of our representatives today. Your designer can also help assist you in choosing the most appropriate roof design for your particular building or construction project.
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