|Denby Dale Passivhaus, Yorkshire||Teplo Tie|
TeploTie, the low thermal conductivity wall tie manufactured from basalt fibre, has been used in the first certified Passivhaus to be built using masonry cavity walls.
Passivhaus is a globally recognised Standard for the construction of low energy buildings which provide excellent levels of comfort in both winter and summer. The first Passivhaus was built in Germany in 1991. However not until 2010 in Denby Dale in West Yorkshire was this Standard adapted to British building methods.
This pioneering work was undertaken by Green Building Company and project leader, Bill Butcher, said of the achievement,
“The Denby Dale Passivhaus proves that it is possible to build an ultra-low energy house using standard British building materials and techniques, at a low cost.”
Achieving the energy efficiency levels of Passivhaus relies on the construction of a well-insulated airtight building envelope, so called “Fabric First” approach. Thermal bridges must be removed wherever possible to limit heat loss. When building with cavity walls, this makes Wall Tie selection particularly important.
Bill Butcher said,
The masonry walls at Denby Dale comprise an inner leaf of dense concrete block, a 300mm cavity filled with fibreglass insulation batts and a natural stone external leaf.
Bill Butcher said of the build method,
The Denby Dale Passivhaus is a 118sqm three bedroom detached house which cost just £141,000 to build. It will require minimal heating with costs of around £75 per year.
The energy required for space heating in Passivhaus does not exceed 15 kWh/m2/yr. This is 90% less than the UK average. Tests at Denby Dale revealed an airtightness of 0.33 air changes per hour at 50 Pa, which is about 25 times better than Building Regulations requirements.
More details on this project can be found here: