Roof Truss Types

There are various different configurations of roof trusses available for different types of roofs.

The configuration of the truss, or truss type, is determined by many factors, one of them being the complexity of the roof, or maybe the roof has a certain style to it. An example of a roof/roof truss style is a Polynesian roof. These roof trusses all have a characteristic ‘kink’ in the top chord of the truss. Basically, the top chord or rafter of the roof truss has two different pitches. Two other examples are Attic trusses and Scissor trusses. Attic trusses have a square web configuration, and are mainly used for storage, or walkways, where as normal roof trusses have a triangulated configuration. Scissor trusses are similar to Polynesian trusses, except that the ‘kink’ is present on the bottom chord, or tie beam. Scissor trusses are very popular for exposed roofs, where no ceilings are added, to appreciate the aesthetic appeal of these trusses. These are only three examples of the many different types of roof trusses available, as you will see below.

Truss Types

Monoplanar pre-fabricated metal connector plate timber roof trusses

Meaning all webs & chords are ambled and connected in a single plane by means of galvanized steel connector plate, pressed into the timber joint from both sides. This created much stiffer and stronger joint.

This differs from the conventional method of bolted and nailed trusses, where the chords and webs are lapped and then bolted & nailed Innovative and challenging architectural designs, requires and demands equally challenging design types of trusses.

These trusses will then create a structure, capable of withstanding all the applied forces, and transferring all the applied loads to the sub-structure.

With the aid of powerful advanced software like Multinail and other systems, it has become possible to meet the demands that the industry requires, within acceptable, workable engineering standards.

The use of various truss types (Configurations) enables us to achieve this.Truss configurations are almost limitless and can be stretched to the imagination.

Different truss configurations

Most commonly used:

  • Howe
  • Fink
  • Scissors
  • Polynesian
  • Bowstring
  • Mono
  • Inverted
  • Queen Post
  • Fan Fink
  • WW
  • Parallel Chord
  • Attic

All of the above share one common characteristic.

All have triangulated configurations, meaning all the trusses are constructed as such, that the chords and webs are connected in a way to created triangles within the truss.

This results in the joints now controlling the strength of the design, rather than the strength of the timber.

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