Thermally efficient extension for listed farmhouse

Renovation of an 18^th century Grade ll listed Dorset farmhouse also included a new, sympathetic vaulted ceiling extension using TLX Gold multi-foil insulation.

Specialist period renovators, Colin Clark Builders Ltd, carried out the work. Due to the requirements of the build and a need to achieve 0.18 U-value for the roof, the company, which also designs and builds sustainable eco structures, 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 other options and TLX Gold by Web Dynamics was chosen to provide the tricky roofing requirements. Installed over rafters, more than 725 sq m of the product was used together with 100mm of Celotex between 6in thick rafters. The roof was completed by Abbey Roofing with peg tiles from Santoff.

David Thorne of the specialist builders said: “This was the first time we had used TLX Gold but we have used it 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. 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.”

As a Grade II listed building the extension needed to meet stringent requirements of English Heritage as well as Building Control. 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’.

More information: www.webdynamics.co.uk