The Food Forest Homestead Extension 2020

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Location
Hillier SA 5116
    • Housing Type:
    • Extension to heritage listed cottage
    • Project Type:
    • Retrofit/addition
    • Builder
    • House of Bales
    • Designer
    • Energy Architecture

About The Food Forest Homestead Extension

Our heritage listed homestead built in 1840 and is one of the oldest buildings in the district. Although laden with charm, history and very thick stone walls, it is dark and cold in winter and stays hot in summer heatwaves.

A passive solar extension was built in 2000. It adds a contemporary kitchen, living and dining areas to the old cottage, combining strawbale, stone, hollow concrete block, and well insulated galvanised iron walls with an oxide coloured slab floor.

Construction materials incorporate recycled doors, windows and masonry.

Using passive solar design principles including North facing eaves, it was designed exclude the summer sun but to let the sun in from late March till the end of October. Thermal mass of the slab floor and a solid internal wall acts as a heat store in winter and a ‘coolth store’ in summer. In summer, good cross ventilation, incl Condor vents and cooling garden areas outside enable rapid cooling at night. The solar hot water system is connected to the Nectre slow combustion heater with a wet-back providing additional heating to our hot water in winter. A 22K rainwater tank provides water to the house. A black and grey water reedbed system cleans all wastewater which is used for irrigation of fruit trees. The house has a 7KW solar system and is connected to the grid. We installed a split system air conditioner in 2018 which is only used strategically during very extreme summer temperatures.

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SUSTAINABLE FEATURES

Years Open
2020
ENERGY AND WATER EFFICIENT FEATURES
    • Energy efficiency:
    • Efficient lighting
      Efficient appliances
    • Passive heating cooling:
    • Cross ventilation
      Deciduous planting around house
      External planting
      Passive solar designed home
      Shading
      Thermal mass

    • Passive heating cooling:
    • condor vents
    • Active heating cooling:
    • Ceiling fans
      Split system airconditioner
    • Water heating:
    • Solar hot water (flat panel)
      Wood fire wetback
    • Water harvesting and saving features:
    • Rainwater storage - Above ground
      Blackwater system
      Grey water system
      Stormwater management
      Low flow shower heads
      Low flow taps
      Drip irrigation
    • Average water consumption per day:
    • 40L
    • Above ground rainwater storage Type:
    • poly tank
    • Above ground rainwater storage Size
    • 22,000L
    • Energy Efficient Lighting
    • LED lights throughout
      Natural daylight
    • Window Protection:
    • Blinds
      Deciduous tree/vegetation
      Drapes/curtains
      Eaves
      Pelmets
      Solar pergola
SUSTAINABLE & RECYCLED MATERIALS
    • Sustainable materials:
    • cavity stone wall recycled stone strawbale wall insulated timer/galv stud wall recycled windows doors
    • Recycled and reused materials:
    • Doors
      Rocks/stone
      Windows
INSULATION SPECIFICATIONS
    • Insulation Type:
    • Under-roof
      Ceiling
      External walls
    • Ceiling Type:
    • rockwool
    • Ceiling Rating:
    • raked ceiling see above
    • Under Roof Insulation Type:
    • rockwool with 2 separate layers of aluminium sarking
    • Under Roof Insulation Rating:
    • ~R3.5
    • External Walls Rating:
    • ~R3.5
    • External Walls Type:
    • rockwool, strawbale wall, cavitiy stone wall
RENEWABLE ENERGY SPECIFICATIONS
    • All-Electric Home?
    • Yes
    • Renewable energy used:
    • Solar PV grid connect
    • Size of PV system:
    • 7kW
    • Average Daily Energy Consumption:
    • 3kWh. There are 4 adults living in the house
COSTS AND COST SAVINGS
    • Total cost of home when constructed:
    • $79,672 (in 2000), for the extension only at 92m2 makes it $862/m2 excl kitchen fit-out and solar panels. If we add the septic tank and reedbed system, the new bathroom & laundry in the old cottage, the total cost is: $99,672 or $958/m2
    • Cost estimate of sustainable home/features:
    • We estimated it at approx. $7,000 more. Our figures $958/m2 for extension and additional bathroom. In 2000 an 'average' architected house would have been costed around $1100-$1200/m2
    • Estimate of annual savings:
    • $2,000
HOUSE DESIGN SPECIFICATIONS
    • House Size
    • 280m2
    • BAL Rating
    • No BAL rating requirements at time of construction
    • Roof
    • Metal (Zincalume)
    • Wall Materials
    • Concrete blocks
      Lightweight construction (timber frame)
      Metal (Zincalume)
      Strawbale
      Stone
    • Window and Door Types
    • Clerestory windows
      Sliding windows/doors
      180 degree opening doors
    • Universal design accessability
    • Multi-generational
    • Universal Design Features
    • 80cm minimum door opening width
    • Number of bedrooms
    • 3
    • Number of bathrooms
    • 2
GARDEN AND WASTE REDUCTION
    • Garden / Outdoors
    • Bee hotels/friendly
      Bird-nesting boxes
      Chickens
      Composting
      Drip irrigation
      Edible garden
      Frog friendly
      Local indigenous plants
      Orchard
      Organic
      Permaculture
      Native plants
      Wicking beds
    • Waste Reduction Practices:
    • Compost all food scraps
      Make jams/conserves
      Pickle and preserve food
      Recycle
      Repair
      Swap with friends and neighbours
      Waste free/reduced construction site

    • Other Waste Reduction Practices:
    • refuse packaging materials as much a possible, shopping at farmers market for local, in season and fresh, freezer.
HEALTHY HOME FEATURES
    • Healthy home features
    • Cabinet design to minimise dust collection
      Carpet free - tiles/concrete/timber flooring throughout
      Chemical free cleaning products used
      Cross flow ventilation
      Natural fibre furnishings
      Natural light and ventilation

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