Roundhay Passivhaus, Leeds
The Roundhay Passivhaus in Leeds is a 4 bedroom contemporary family house aiming for Passivhaus certification. The house was built using dense blockwork in a wide cavity wall construction with warm roof of timber I-beams. External finishes are a combination of timber cladding and K-render.
The project had initial architectural and Passivhaus detail design input from Eric Parks, Architect and Certified Passivhaus Designer at Buckrose Ecological Architects – up to Building Regulations and Tender submissions – with subsequent project management, procurement, building physics and detail construction input from client Richard Spencer, who is an Engineer and Certified Passivhaus Consultant at LEDA. K & P Horton Builders were the main building contractor on the project. 21° supplied triple glazed timber windows and doors, from its ULTRA and PROGRESSION ranges, for the project, as well as designing, supplying and commissioning the MVHR system.
Design
The project is in the process of applying for Passivhaus certification but the latest modelling for the project shows:
- Airtightness n50 = 0.45/h
- Annual heating demand 14 kWh /(m2a ) calculated according to PHPP
- Heating load 10 W/m2
- Primary energy requirement 80 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP
- Walls: full fill cavity with 300mm mineral fibre insulation U-value = 0.102 W/(m2K)
- Floor: U-value = 0.098 W/(m2K)
- Roof U-value = 0.104 W/(m2K)
Triple glazed timber windows & doors
21°s ULTRA insulated frame tilt and turn and PROGRESSION tilt and turn windows were specified for the project, as well as ULTRA doors. The windows have been installed within the timber or render exterior elements, using plywood boxes with some timber noggins for additional support for the larger windows. Some of the windows were designed with splayed reveals internally to maximise daylight.
Richard Spencer
MVHR heat recovery ventilation
21° designed, supplied and commissioned the PAUL Novus 300 MVHR system, with rigid spiral wound steel ductwork for the project.
Richard Spencer
More information
Architect
Eric Parks
Buckrose Ecological Architects