Roof trusses, sometimes referred to as trussed rafters, are the most common type of frame structure used to support roofs. Trusses are generally easier to install and more affordable than other roof support structure. Timber roof truss systems generally require less material than onsite loose cut roofs as well.
Not all trusses are the same though; it really depends on the specification of the construction and any architect’s drawings available. While trusses have an important function to perform – i.e. supporting the roof – they are also used to add some aesthetic appeal in some projects.
Trusses are triangulated roof frames designed to provide clear spans between any supporting walls. They are usually pre-fabricated off site in a factory like ours and then delivered to the site.
Roof trusses are made of several components which include: bottom chords, top chords, king post, web members, nail plates, heels and truss clips.
We now mention some of the most common roof trusses.
A fink truss is an extremely basic yet highly effective roof truss. And it is one of the most frequently ordered trusses here at ETS. The standard Fink truss is used for the majority of new build developments in the UK being favoured by many of the national housebuilders for its versality. Also, the webbed design means that this type of truss offers a good load bearing capacity. One of the other benefits of the webbing is that the space between the members provides some additional storage space which has been used for water tanks and central heating boilers in some projects.
Raised Tie Trusses
Raised tie trusses create additional height in a building. The lower chord is raised to create a flatter profile for higher ceilings without having to increase the external height of the building. Raising the bottom chord also provides additional support if the loading conditions require it. While the raised tie truss creates additional height the downside is that any windows would be lower down in the room thus limiting the amount of natural light closer to the roof area.
Attic trusses are the go to option when a builder or home owner wants to support a roof but also needs to create a space that is habitable. Essentially people can move within this type of truss design. Here is an example where we have used attic trusses on a project in the Midlands.
A significant benefit of using attic trusses is that in one architectural component you have a timber roof support as well as the floor structure. Attic trusses are therefore sometimes referred to as room-in-attic trusses.
Attic trusses are quite versatile though and we have also designed this type of truss for barn conversions, house extensions and garage conversions.
You have probably come across the scissor truss in building designs that call for a vaulted ceiling.
It is the scissor truss that creates the dramatic effect you may have found in great halls, living rooms and master bedrooms. This affect is created by the sloping bottom chord members.
It is common to expect that scissor trusses are more expensive than other truss designs mentioned here.
Special Feature Trusses
Feature trusses are called for when the truss becomes a decorative element of a building. Think of entrance halls in commercial and residential projects where your eye is naturally drawn to look upwards. These types of trusses add architectural character to a property and create an instant visual impact. Of course, feature trusses still have to support the roof.
Choose the most suitable types of roof trusses
Timber roof trusses have been used in the construction industry for centuries and while manufacturing processes have changed over the years the same essential design principles are followed today.
Each of the 5 roof truss designs referred to in this article offer a convenient and reliable support structure whether you are building a large commercial project, a new housing development or want to add a small extension to your home.
We have only listed 5 commonly used roof trusses but there are many more types available. And don’t forget the featured truss for when you want the “WOW” affect.
We at ETS are a reliable and trusted provider of engineered roofing solutions. We take great pride in providing high quality services to our clients.
Every building project has its own set of unique challenges and budget that is why we recommend taking advantage of our free advice, quote and design service so that you get the most appropriate type of trusses for your project.