Browne Residence Cambridge
Passive House Metrics
- Heating Demand 14.7 kWh/m2/year
- Heating Load13.3 W/m2
- Frequency of Overheating0%
- TFA 207.6 m2
- Form Factor 3.1
- Air leakage @ 50Pa0.3 ACH/hour
- PER demand42 kWh/m2/year
Dunedin firm Architype designed and built this home for a couple relocating to Cambridge who wanted a comfortable, energy-efficient house that would meet their needs as they aged. The layout, structure, services and aesthetics of the building tightly work together to create a simple yet extremely high-performance building.
The Browne residence was Architype’s first North Island Passive House project; its team is accustomed to designing for much colder, southern climates. It illustrates perfectly how the complexity of a Passive House scales according to the climate in which it is built.
Waikato’s relatively mild climate provided an opportunity to meet Passive House standards using a different, simple formula. Various combinations were considered in PHPP and this software provided certainty that a certification-worthy build was possible with the use of New Zealand-made SIPs, 300 mm thick ceiling insulation, double-glazed timber-framed windows and a simple (albeit carefully modelled) insulated slab. Wide eaves shade the high summer sun; combined with other design elements, no overheating is anticipated.
The architect met the challenges of the long, narrow site and district plan setback requirements, creating a layered building with strong horizontal landscaping that offers private, north-facing outdoor space.
Construction Details Average Values
- U-value External Walls 0.26 W/(m2K)(R3.8)
- 115mm NZSIPs
- U-value Floor0.23 W/(m2K)(R4.3)
- Max Raft floor
- U-value Roof 0.15 W/(m2K)(R6.7)
- 300mm Batts in roof
- U-value Glass1.12 W/(m2K)(R0.8)
- PlaniTherm XN
- U-Windows1.34 W/(m2K)(R0.7)
- Air Control Layer
- SIP, Intello, Concrete Slab
- Ventilation Efficiency 85.61%
- Zehnder Q350