A Grade II listed farmhouse has gained a thermally efficient extension that meets the stringent requirements of English Heritage and Building Control.

The project, which also included the renovation of the 18^th Century farmhouse by specialist period renovators Colin Clark Builders Ltd, saw the building of a brand new extension designed to be in keeping with the original Georgian construction.

Due to the requirements of the build and a need to achieve 0.18 U-value for the roof, the company looked for a product which would enhance the thermal performance of the extension and would also be easy to work with. The vaulted ceiling ruled out many other options and TLX Gold was chosen to manage the tricky roofing requirements.

As a Grade II listed building, the extension had to meet stringent requirements of English Heritage, as well as Building Control, and TLX Gold, which achieved ETA* (European Technical Approval) in 2011, is just 33mm thick and its design enables it to control water vapour and air movement - allowing a building to `breathe’.

David Thorne of Colin Clark Builders Ltd said: “This was the first time we had used TLX Gold but we have used it on several occasions since. It was easy to install and presented no problems, enabling us to comply with Part L building regs without having to insulate underneath the rafters, saving labour costs and time on the project.

“It’s also a benefit to insulate externally, helping to keep the roof structure itself above dew point temperature - a good solution for a host of reasons.” 

Installed over rafters, more than 725 sqm of TLX Gold was used with 100mm of Celotex between six inch rafters. The roof was completed with peg tiles from Santoff.

The roofer on site, Steve Frost of Abbey Roofing, commented: “Although we hadn’t used this product before we have continued to use it in many of our other projects - both for refurbishment and new build. It installs as a normal roofing tile underlay but with the added benefit of additional thermal qualities. It will continue to be an important roofing product in our business.”

The product has successfully been put to the test in the refurbishment of a number of historic buildings as well as many public sector, retro-fit social housing, property conversion and new build projects.

TLX Gold, which is available in a 1.2m width and 10m length, has been designed to reflect heat back into a building to conserve maximum energy and often proves popular for traditionally hard to insulate buildings.

Manufactured in the UK, the TLX range of multifoil insulation has achieved LABC Registered Details and is fast and simple to install. Web Dynamics’ technical team will provide advice on which insulation construction to use and the company offers U-value and condensation risk calculations and can answer queries concerning specification or installation of any of the TLX range.