What affects the cost of Roof Trusses?

At RML we offer complete roof truss solutions, facilitated by our experienced design team across the UK. Our technical designers work closely with architects, surveyors and contractors, providing part or complete roof truss systems from wall plate upward – using the latest design software. Our team evaluate the best roofing solution for our customers and the cost of Roof Trusses can often depend on the building design and load bearings.

A Roof Truss is an engineered timber product, which is held together by nail plates which are pressed on our modern equipment. Although trusses are designed as individual components, when erected they form the overall roof scape of a building. Most trusses will have rafters, ceiling chords and webs which are made from graded timber.

The individual pieces of timber are subjected to forces from the building which means they are always either in tension or compression:

A member which is subject to tension is always being pulled or stretched.

A member which is subject to compression is always being pushed or compressed.

Roofs constantly have forces applied to them, whether it be the self-weight of the materials, the weight of the tiles, the force from a gust of wind or the load from snow during the winter. These forces dictate how much the roof truss is being tested in both tension and compression.  If a member is tested to the point where it is under too much strain, then the bespoke software we use will automatically specify a larger section of timber which will perform with a built in safety factor.

As a result of the size of the building and forces applied, this will ultimately influence the size and quantity of the timber members used to construct the truss. 

As a rule of thumb, the larger the span and the higher the loading is, the more timber is required and therefore more material cost. The only way this can be minimised is with supporting walls inside of the building, or steels. 

Attic trusses (for a room in the roof) or raised tie trusses (giving a semi-vaulted effect) are more expensive due to the larger loads being applied and the configuration of the rafters, ceiling chords and webs.

Whilst remaining competitive with our prices, our design teams will always utilise their expertise to ensure the long-term durability and safety of our customer’s roof structures. Along with receiving regular comments around the quality of our products, the unwavering support of our teams through the design, production and post-purchase process is what allows RML to give added value.

To receive a quote for your project, please give us a call on 01933 279597 or request a quote online here.


If you have a development project you’d like to talk to our timber frame team about, email sales@rmuk.co.uk or call us on 01933 279597.