Why should I use trussed rafters?
When you build with trussed rafters the sky is the limit. Trussed rafters can be used on a wide range of building types including timber frame, masonry and steel frame. From circular roofs to curved roofscapes, TRA members have the design expertise and the right equipment to produce the design solutions your project needs.
Trussed rafters are designed to your exact specifications, fabricated in a factory-controlled environment, and then delivered to you, saving you time, effort and money. No matter how complex your roof design, TRA members can develop a truss to support it.
What timber is used in the manufacture of trussed rafters?
The timber used varies from supplier to supplier. However, all TRA members commit to only using timber that has been responsibly sourced from sustainable sources certified by either the Forest Stewardship Council (FSC) or Programme for the Endorsement of Forest Certification (PEFC).
How much do trussed rafters cost?
There is no set price for trussed rafters as this will vary from manufacturer to manufacturer and there are many variables, such as rafter size, that can affect the cost.
We recommend you contact your local TRA member who will be happy to give you a custom quote for your precise requirements.
I need to compare trussed rafter quotes. How can I be sure I am comparing ‘like with like’?
No one likes hidden extras. When you ask a TRA member for a quote, they will prepare a detailed, itemised quotation listing all the items that you require for your project. Typically , this will include all roof trusses, the required stability bracing, timber to timber metalwork and all structural loose timber above the wallplate.
I am building a Room in Room in the roof for a customer - how do I modify trussed rafters for an attic?
Trussed rafters must be braced to create a rigid and stable roof structure. If the bracing is omitted, wrongly positioned or badly fixed, it may result in distortion or failure of individual trusses or, in some instances, the whole roof. Roof bracing performs three distinct functions:
- Temporary bracing – This is used to restrain the trusses during erection.
- Truss stability bracing – This is permanent bracing which holds the trusses upright, straight and prevents any out-of-plane buckling of the members.
- Wind or wall bracing – This bracing is installed in the roof in addition to the truss stability bracing and its purpose is to stabilise the gable walls under the action of wind loading.
Check out our technical guidance for further information.
What are metal web joists?
Metal web joists are engineered structural beams that combine structural timber with high strength steel webs to form a lightweight, structural beam for use in a range of floor or wall applications. Metal web joists (also known as Open Web Joists, and often sold under brand names such as Posi Joist, easi-Joist and Eco Joist), provide huge benefits – read more here.