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Types of Roof Trusses and Which Ones to Choose?

Last month we posted an article explaining what a roof truss was: that it is the internal framing of the roof and supports the weight of the roof. To explain more on this topic, this month we’re going to take a closer look at some of the different types of roof trusses and which one is right for your next building project.

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Monday 5 November 2018

One of the most common types of roof truss is the King Post Truss. This truss spans up to 8m, making it perfect for many types of houses – but particularly smaller ones. While this truss is usually made out of wood, it can also be made out of a combination of wood and steel. The shape of this truss allows it to support quite an expansive weight. The post extends vertically from the horizontal crossbeam reaching the apex of a triangular truss.

Another common roof truss is the Queen Post Truss. This truss is able to span much longer than the King Post, allowing it to facilitate much larger buildings. Versatile, yet with a simple structure, the Queen Post Truss is a reliable choice for many buildings. The structure of the Queen Post Truss is not dissimilar to the King Post Truss, both form a triangular truss with an apex and horizontal crossbeam. However, while the King Post Truss only has one supporting truss, the Queen Post uses two central supporting posts to distribute weight even better.

The Scissor Post Truss has quite a different structure to the above mentioned posts. This truss does not have a triangular shape but rather is very aptly named as it has the appearance of an open pair of scissors. This structure gives a vaulted ceiling and is therefore a very common choice of truss for Cathedrals. The benefit of Scissor Post Trusses is that they provide more attic space as they do not require beams. However, a drawback that needs to be considered is that the vaulted structure provides little space for insulation and as a result this truss is not very energy efficient.

Finally, there is the Fink Truss. This truss is the classic triangular truss shape that was before seen in the King and Queen Post Trusses. However, this truss has a web-like configuration of posts between the apex and crossbeam. Consisting typically of a W-Shape, the posts are diagonal and distribute weight evenly across the roof.

Trusses are an increasingly popular choice due to their versatility and efficiency. They are able to be built off site and transported to location, cutting down on your labour costs. In fact, cost is just one of the factors you’ll want to consider before deciding on your type of truss.

First, you’ll need to take into consideration aesthetics. Contemplate the exterior of your house, the shape of roof you choose can alter your look entirely. Then consider the interior. What do you want your ceiling to be like? There is also the possibility of using various types of trusses in different rooms for different looks.

Once you’ve decided on your type of truss you also need to consider the pitch of your roof (how steep it will be). For this you’ll need to consider a host of other factors. For example, a flat roof will collect more snow during the winter but a very steep roof will be harder to work on. Consider your location and how much sun will reach the roof.

Trusses are immensely accurate, computer designed and factory assembled, it is no surprise that they are becoming so popular. The only question is: which truss is right for you?

It’s an important decision to make, so why not speak with one of our experts. Call into your local Haldane Fisher to discuss which roof truss is the perfect fit for your building.