Asquith PassivHaus 2021

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House Notes – Asquith PassivHaus

Knock-down-rebuild house for a family of 5, designed by leading Australian sustainable architects Envirotecture, and built by a Sydney builder Superior Constructions to meet the world’s best practice German PassivHaus standard for energy efficiency, thermal comfort and indoor air quality.

It is a two storey timber frame building, built using an innovative modular prefabricated panel system, designed and manufactured in Victoria by CarbonLite, at the time of construction, the only supplier in Australia certified to produce a prefabricated PassivHaus Certified wall and roof assembly system. This ensured a high level of quality and precision, and also meant the entire project took approximately 8 months from demolition to completion, much faster than a conventional building process. The frame was erected in just 3 days.

The house features solar shading, advanced double glazed windows, improved insulation, and a filtered fresh air ventilation system. It will also incorporate a large photovoltaic array, a green roof over the garage, grey water and rainwater reuse for landscape irrigation, and extensive gardens for food growing and native plants.

The cladding is a zero carbon wood fibre composite panel product made from native Australian timber offcuts by a family owned company based in the Hunter Valley, Weathertex. It will have a sprinkler system on the façade to protect the house from ember attack, making it more resilient to bushfires.

The finance (mortgage & construction loan) has been provided through the CEFC-backed Bank Australia Clean Energy Home Loan, and this house is the first to secure this funding using the Passive House Certification pathway. It is also one of a select group of the first homes to pilot the Green Building Council of Australia’s Green Star Homes standard.
I believe it is a model for a healthy, comfortable and efficient modern Australian homes.

SUSTAINABILITY FEATURES

Years Open
2020
2021
ENERGY AND WATER EFFICIENT FEATURES
    • Energy efficiency:
    • Draught proofing
      Efficient lighting
      Efficient appliances
      Energy monitoring
      Smart home features

    • Energy efficiency:
    • air tight home
    • Passive heating cooling:
    • Cross ventilation
      Heat recovery ventilation system
      Passive solar designed home
      Shading
      Thermal mass
    • Active heating cooling:
    • Ceiling fans
      Heat exchange ventilation system
      Heat pump
      Split system airconditioner
    • Water heating:
    • Hot water heat pump
    • Water harvesting and saving features:
    • Rainwater storage - Underground
      Grey water system
      Low flow shower heads
      Low flow taps
      Drip irrigation
    • Average water consumption per day:
    • 0.08 kL / <80 litres per person per day
    • Underground rainwater storage type:
    • 10,000 litre storage tanks under driveway (2 x 5kL)
    • Underground rainwater storage Size:
    • 10,000
    • Energy Efficient Lighting
    • LED lights throughout
      Natural daylight
    • Electric Vehicle Type
    • EV charger installed for BEV / PHEV future purchase
    • Window Protection:
    • Adjustable Shading
      Automation/controls
      Awnings (external)
      Blinds
SUSTAINABLE & RECYCLED MATERIALS
    • Sustainable materials:
    • Prefabricated wall and roof panels
INSULATION SPECIFICATIONS
    • Insulation Type:
    • Under-roof
      Internal walls
      External walls

    • Under Roof Insulation Type:
    • Insulated panels
    • Under Roof Insulation Rating:
    • R 6
    • Internal Walls Insulation Type:
    • Bulk – glass wool
    • Internal Walls Insulation Rating:
    • Acoustic insulation
    • External Walls Rating:
    • R 2.8
    • External Walls Type:
    • Bulk – glass wool
RENEWABLE ENERGY SPECIFICATIONS
    • All-Electric Home?
    • Yes
    • Renewable energy used:
    • Solar PV grid connect
    • Size of PV system:
    • 20 kWp
    • Average Daily Energy Consumption:
    • averaging ~18kWh/day for five people
COSTS AND COST SAVINGS
    • Total cost of home when constructed:
    • $1.3 million total construction costs (on completion valuation $2.3m)
    • Cost estimate of sustainable home/features:
    • 5%
    • Estimate of annual savings:
    • 90%
HOUSE DESIGN SPECIFICATIONS
    • House Size
    • 275
    • BAL Rating
    • BAL – Low: There is insufficient risk to warrant specific construction requirements
    • Roof
    • Green roof
      Metal (Colorbond)

    • Roof
    • Solar PV above colourbond
    • Wall Materials
    • Lightweight construction (timber frame)
    • Window and Door Types
    • Double glazing
      Low-e, films
      Tilt and turn
    • Universal design accessability
    • Multi-generational
      Wheelchair accessible
    • Universal Design Features
    • 80cm minimum door opening width
      Flush thresholds (no lip) to all external doors
      Hobless showers
      Kitchen bench/table for wheelchairs to access (75-85cm high)
      Lever handles for doors (no knobs)
      Minimum 110cm wide hallways
      Ramps and path gradients must be less than 20:1
      Pocket doors so that cabinet doors are out of the way
      Space around toilets for ease of access in wheelchairs
      Strong fittings like towel rails that can be used as hand rails
      Tapware to be easily accessed from outside the shower

    • Universal Design Features
    • Livable Housing Australia - Silver level livable housing design - for the ground floor
    • Number of bedrooms
    • 5
    • Number of bathrooms
    • 4
GARDEN AND WASTE REDUCTION
    • Garden / Outdoors
    • Bee keeping
      Chickens
      Composting
      Drip irrigation
      Edible garden
      Green roof
      Local indigenous plants
      Native plants
    • Waste Reduction Practices:
    • Compost all food scraps
      Make jams/conserves
      Recycle
HEALTHY HOME FEATURES
    • Healthy home features
    • Airtight house design
      Automated ventilation system
      Carpet free - tiles/concrete/timber flooring throughout
      Heat recovery ventilation (HRV)
      Low VOC paints/sealer/varnish
Location
Asquith NSW 2077
    • Housing Type:
    • Standalone House
    • Project Type:
    • New Build
    • Open with support of
    • Australian Passive House Association
    • Builder
    • Jamie Graziano, Superior Constructions
    • Designer
    • Envirotecture

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