Roof Truss Design

What Is The Strongest Roof Truss Design?

Trusses provide stronger, well-engineered rafters and joists that can be easily joined in one unit. Prefabricated trusses have changed roof framing.

The truss is the roof’s frame, and it is designed to provide support and strength. These bridges are arranged at regular intervals above rooms. Longitudinal posts are spaced to support them. Their purpose is to ensure that the roof stays intact through their triangular wooden structures.

There are many variations of timber roof trusses to choose from. They all have their own strengths and benefits. So which roof trusses are the best, strongest option for your construction project?

What makes a strong roof truss design?

The design of roof trusses makes them stronger than any other arrangement of structural elements in your roof. That’s because they can stand huge forces of tension and compression. It matters what material you use. Timber for example is extremely strong when assembled into a prefabricated roof truss.

When a roof is supported by roof trusses, it is both healthy and functional. That means a roof is able to properly reflect UV rays and ward off condensation and mould.

What are the different designs and which is the strongest?

Roof Truss DesignTrusses come in various strengths, but the one that is most appropriate for a particular application will be the strongest. Roof truss design has five basic categories: dropped chord, raised chord, parallel chord, raised heel and scissors.

Raised chords. 

The benefits of raising the truss higher are twofold. It simplifies attic ventilation and leaves space above the exterior wall top plates for insulation. This is the most common of roof truss design used in housing.

Dropped chords.

With the dropped chord, a conventional truss is topped with a second chord truss to minimise uplift. This type of truss creates a vapour barrier similar to the raised heel truss. They have great insulation properties. In the intersection of walls and ceilings, vapour barriers require additional blocking and siding. That can increase construction costs.

Parallel chords.

Due to the use of steel elements, the cost of this design is higher. High ceiling buildings use this design for cathedral ceilings, because it is durable and reliable. Because this design uses steel, there is thermal bridging, which makes it less energy efficient. It is aesthetically pleasing due to its parallel placement of elements.

Raised heel.

When you are looking for an energy-efficient truss design, a raised heel is an excellent option. The elements of a roof truss design are arranged in such a way that they create a vapour barrier. That eliminates condensation problems in humid areas. Due to the truss’ insulation, it increase the cost, but the elements are also protected from the environment. This design is commonly used in houses and buildings with attic space.


Vaulted ceilings often feature this design. As the trusses provide plenty of support, no bare beams are needed. The scissor roof truss gets its name from the way it slopes inward. The drawback of this design is that it’s difficult to insulate.

All truss designs provide a sturdy foundation for the roof. Trusses have been tested and improved for years so it all comes down to which option is best for your project.

If you would like to learn more about roof trusses and which solution is best for you contact us for a fast quote.

We can provide quotes, budgets, and advice. Contact us today on (02) 4351 2616 and speak to one of our experts. You can visit us at, if you need additional information about our products and services.

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