Grey and green retrofit house 2019

House Notes – Grey and green retrofit house

Three years ago, as our family and work circumstances changed, we ‘downshifted’ to a 1920s single storey semi-detached house. We try to live sustainably as possible and also hope to ‘age in place’, hence the need for a ‘grey and green’ home, which was designed to allow us live independently as long as possible. For this reason, proximity to amenities, transport and a level block, are as important as the actual house.

Our ‘new’ 100 yr old semi, on the southern side of an East/West orientated block, presented some challenges for solar energy placement and light. While designing around this problem, we also wanted to preserve the original house aesthetic while making necessary changes that were sympathetic as well as sustainable and energy efficient. The main one was the removal of an asbestos “fibro” extension, replacing it with an energy efficient, multi-purpose extension.

‘Age in place’, long-term sustainable living, simplicity and integration of indoor/outdoor space were guiding principles in our plans to renovate and retrofit. We worked with Andy Marlow from Envirotecture who designed the new extension around this brief, respecting our budget limitations. Andy also developed some creative solutions to overcome a number of site constraints as well as advising on how to best retrofit the existing house for energy efficiency.

While waiting for approvals and the builder, we retrofitted areas not affected by the building work. This included draft-proofing, insulating, kitchen renovation, heat-pump hot water after converting to an all-electric house, establishing an organic garden and retrofitting the old asbestos ‘fibro’ garage to create a workshop/studio. The result lives up to our hopes and expectations in liveability and energy efficiency. However, it is still a work in progress.

Most people comment “it doesn’t look like a sustainable house, it looks normal”. It is only when we point out some of the sustainable features that people realise it is “different”. We hope that our house helps to ‘normalise’ views of sustainable housing.

Sustainability Features

Years Open
2019
ENERGY AND WATER EFFICIENT FEATURES
    • Energy efficiency:
    • Draught proofing
      Efficient lighting
    • Passive heating cooling:
    • Cross ventilation
      Shading
    • Active heating cooling:
    • Ceiling fans
    • Water heating:
    • Hot water heat pump
    • Water harvesting and saving features:
    • Above ground rainwater storage
      Low flow shower heads
      Low flow taps
      Drip irrigation
    • Average water consumption per day:
    • 0.16kL
    • Above ground rainwater storage Type:
    • 1 x poly and 1 x steel tank
    • Above ground rainwater storage Size
    • 1,110L and 2,500L tanks
    • Storage connected to
    • Garden
    • Energy Efficient Lighting
    • LED lights throughout
      Natural daylight
      Skylight
      Solar skylight
      Tubular skylight
    • Window Protection:
    • Awnings (external)
      Deciduous tree/vegetation
SUSTAINABLE & RECYCLED MATERIALS
    • Sustainable materials:
    • Bulk polyester insulation as recycled PET, Re-used sandstone in slab fill, Re-used timber in fittings
    • Recycled and reused materials:
    • Bathroom cabinets
      Insulation
      Rocks/stone
      Timber
INSULATION SPECIFICATIONS
    • Insulation Type:
    • Under-roof
      Ceiling
      Internal walls
      External walls
    • Ceiling Type:
    • Glass wool in existing and Polyester in new
    • Ceiling Rating:
    • R4.0 and R2.5 dependent on location
    • Under Roof Insulation Type:
    • Dependent - have used Kooltherm, insulated reflective foil and insulated panel dependent on room and roof type
    • Under Roof Insulation Rating:
    • R2.0 Kooltherm, R1.5 insulated reflective foil and R5.0 structural insulated panel
    • Internal Walls Insulation Type:
    • Bulk – polyester
    • Internal Walls Insulation Rating:
    • R2.5 only in renovated section of house
    • External Walls Rating:
    • R2.5 only in renovated section of house
    • External Walls Type:
    • Bulk – polyester
RENEWABLE ENERGY SPECIFICATIONS
    • All-Electric Home?
    • Yes
    • Renewable energy used:
    • Solar PV grid connect
    • Size of PV system:
    • 4kW
    • Average Daily Energy Consumption:
    • 5kW/hr
HOUSE DESIGN SPECIFICATIONS
    • House Size
    • 120m2
    • BAL Rating
    • BAL – Low: There is insufficient risk to warrant specific construction requirements
    • Roof
    • Insulated panel (sandwich panels)
      Tiles (Clay)
    • Wall Materials
    • Double brick
      Lightweight construction (timber frame)
    • Window and Door Types
    • Awning
      Double glazing
      Sliding windows/doors
      Skylights
      Sun Tunnel/SolaTube

    • Window and Door Types
    • Magnetite - retrofit double glazing
    • Universal design accessability
    • Adaptive design
      Multi-generational
    • Universal Design Features
    • Kitchen bench/table for wheelchairs to access (75-85cm high)
    • Number of bedrooms
    • 2
    • Number of bathrooms
    • 1
GARDEN AND WASTE REDUCTION
    • Garden / Outdoors
    • Bee hotels/friendly
      Drip irrigation
      Edible garden
      Green walls
      Organic
      Permaculture
    • Waste Reduction Practices:
    • Compost all food scraps
      Recycle
      Repair
      Swap with friends and neighbours
HEALTHY HOME FEATURES
    • Healthy home features
    • Chemical free cleaning products used
      Cross flow ventilation
      Indoor plants for air filtration
      Low VOC paints/sealer/varnish
      Natural fibre furnishings
      Natural light and ventilation
      No carpets
Location
Balgowlah NSW 2093
    • Housing Type:
    • Semi-detached house
    • Project Type:
    • Renovation and DIY retrofit
    • Builder
    • P V Construction for new extension; Peter Kubis carpenter for retrofits; Outside Concepts Lane Cove rear awning
    • Designer
    • Envirotecture

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