Browne Residence Cambridge

Project Team

Architecture & Passive House Design Architype NZ –architype.co.nz
Construction eHaus Waikato – Brown Construction Ltd
Certifier Sustainable Engineering Ltd – www.sustainableengineering.co.nz

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

Passive House Database 5661

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 [see page XX] 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)
  • Döpfner
  • Air Control Layer
  • SIP, Intello, Concrete Slab
  • Ventilation Efficiency 85.61%
  • Zehnder Q350