First Passivhaus Plus project in the UK certified
Osborne House in Fulford, York has received Passivhaus Plus certification, meeting stringent Passivhaus standards supplemented by renewable energy generation.
The detached family house is the first certified Passivhaus Plus project in the UK.
The client decided to go down the Passivhaus route after being convinced of the many benefits of building to the standard, such as extremely low heating costs, improved comfort levels and the quality assurance provided by achieving full Passivhaus certification.
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The construction was more complex than would have been ideal because of budget constraints. For example, external walls were originally designed as deep-section timber frame with render on board, but it was far cheaper to build a cavity wall with 'conventional' timber frame inner leaf and rendered blockwork externally, with multiple layers of insulation.
Phil Bixby, Constructive Individuals
A building built to Passive House Plus standard must not consume more than 45 kWh/m².yr of renewable primary energy. In addition, at least 60 kWh/m².yr of energy in relation to the area covered by the building must be generated.
Thermal performance
|
Thermal Energy demand |
14 kWh/m2.yr |
|
Thermal Energy load |
10W/m2 |
|
Primary Energy Renewable |
114 kWh/m2.yr (demand - 59 kWh/m2.yr, generation - 89 kWh/m2.yr) |
|
Airtightness |
0.41 ACH@50pascals |
Project team
|
Client |
Private |
|
Architect |
Phil Bixby, Constructive Individuals |
|
MVHR consultant |
Adam Dadeby, Passivhaus Store |
|
Renewables consultant |
The Phoenixworks |
|
Contractor |
Transcore Ltd up to watertight shell construction, with the rest of the project managed by owners |
|
Structural engineer |
Stuart Agars |
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Above L-R: Airtightness expert Paul Jennings conducts air test; South-facing aspect of building
Materials
|
Element |
Materials |
U-value |
|
Wall |
Cavity wall, timber frame inner with rendered blockwork outer |
0.133 W/m2K |
|
Roof |
Timber I-Joists with mineral wool filling, PU insulation internally |
0.083 W/m2K |
|
Floor |
Slab on 300mm EPS insulation |
0.123 W/m2K |
|
Windows |
Alu clad timber |
0.74 - 0.89 W/m2K |
|
Doors |
Alu clad timber |
0.78 W/m2K |
Further information:
14th June 2016
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