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Roof Trusses & Joists

Types of Roof Trusses

The types of roof trusses available are wide ranging – they come in many varying shapes, sizes and profiles. It’s safe to say we have seen them all in our time and below are just some of the roof truss types that we have manufactured. If you’re a self-builder and are getting to grips with your roof design then we hope this will help you to decide which type of roof truss you are looking for.

It’s important to keep in mind that this list is not exhaustive and many types of roof trusses can be modified such as being cantilevered or part-profiled but this should serve as a good basis for your reference. The profile you choose will enable designers, architects and engineers to begin preparing an economic and practical scheme.

If you would like any further information or technical advice on which type of truss would be feasible for your build then please do not hesitate to contact a member of our design team at the office who will be more than happy to discuss your requirements with you.

Kingpost Roof Trusses
The Kingpost truss is suitable for spans up to 4 metres. They are used primarily in small house extensions and garage construction.
Queenpost Roof Trusses
The Queenpost truss is suitable for spans up to 5.5 metres. They are used in domestic type structures such as extensions.
Fink Roof Trusses
The Fink truss is suitable for spans up to 9 metres. This is the most commonly used truss shape and will handily accommodate a water tank should it be necessary.
Fan Roof Trusses
The Fan truss, generally used for spans over 9m. For this reason, they are primarily used in commercial projects or for large domestic dwellings.
6:4 Roof Trusses
The 6:4 truss can span similar spans as the Fan & Double W trusses but tend to be the most cost effective web configuration for trusses spanning over 10m as the timber sizes can remain smaller.
Howe Roof Trusses
The Howe configuration is primarily used in girder trusses which support on-coming trusses when there are no load bearing walls available.
Double W Roof Trusses
The Double W truss is typically used for spans of 15 - 16 metres. Like Fan trusses, they are primarily used in commercial projects or for a large domestic dwelling.
Raised Tie Roof Trusses
The Raised Tie truss can be used to provide a sloping ceiling or skeiling effect. The ceiling member of the truss is raised above the wallplate which in turn gives extra internal head height.
Scissor Roof Trusses
The Scissor truss has a sloping bottom chord as a means of providing extra headroom. The difference between the top and bottom pitch is generally 12.5 degrees.
Modified Scissor Roof Trusses
The Modified Scissor truss shares the same detail as a standard Scissor truss but introduces a flat section to the ceiling.
Mono Roof Trusses
The Mono truss is diverse and can be used in several situations ranging from lean to roofs, hipped end roofs, spanning onto fire walls or used back to back onto a central corridor wall.
Hip Roof Trusses
The Hip truss is most commonly used in hipped roof construction but can also be modified where a flat roof is required or for reduction in height due to a planning requirement.
Lattice Roof Trusses
The Lattice truss can be used for diverse scenarios such as infilling large attic sections around dormers and stairs or used at ridge level when the span is too large for a ridge beam.



Read more information about our Roof Trusses on the following pages

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