Kambah Passive House 2024

House Notes – Kambah Passive House

An ex-guvy three-bedroom home, with an addition being turned into a multi-generational Certified Passive House with the objective to carry out all the Passive House upgrades of the existing home externally, to limit the disruption to the occupants. Timber-aluclad windows were imported from Europe, the external brickwork was removed and a second 90mm wall introduced to allow for extra insulation, a secondary roof was added on top of the existing roof and filled with hi-density blow-in insulation, and the floor bearers were jacked up a few millimetres to allow the membrane to run under the whole sub-floor and insulation place in the bearer and joist area.

A single vapour permeable building wrap is used to the walls, roof, and sub-floor areas and taped to form one single continuous layer.

The walls and the roof use a vented cavity construction, so as the sun warms the walls or roof the heat behind the cladding rises and vents through the ridge via ridge vents keeping the area behind the cladding cool. The higher the radiant heat, the stronger the ventilation.

Presently, only a 2.5Kwh reverse cycle AC is installed and used only occasionally, and given the house is around 280m2, occupied throughout the build, as yet to be finished (Feb 2024), having no plasterboard installed, missing insulation, external shading incomplete, and yet is managing to stay under 25 degrees says something about the Passive House standard and technology used throughout.

Sustainability Features

Years Open
2024
ENERGY AND WATER EFFICIENT FEATURES
    • Energy efficiency:
    • Draught proofing
      Efficient lighting
      Efficient appliances
      Energy monitoring
      Smart home features
    • Passive heating cooling:
    • Cross ventilation
      Passive solar designed home
    • Active heating cooling:
    • Heat exchange ventilation system
      Split system airconditioner
    • Water heating:
    • Hot water heat pump
    • Water harvesting and saving features:
    • Rainwater storage - Above ground
    • Above ground rainwater storage Type:
    • Plastic slimline
    • Above ground rainwater storage Size
    • 5000 litre
    • Energy Efficient Lighting
    • LED lights throughout
      Natural daylight
    • Window Protection:
    • Adjustable Shading
      Automation/controls
      Awnings (external)
      Blinds
      Eaves
      Shade Sails
SUSTAINABLE & RECYCLED MATERIALS
    • Sustainable materials:
    • -Where possible old and unwanted items and materials were given away or sold on Gumtree and many items purchased including the items listed below. -Old windows given away on Gumtree -Old roof tiles sold on Gumtree. -Garden plants given away on Gumtree. -Used treated pine pergola from Gumtree used of decking frame. Free but had to dismantle the pergola. -Used large hardwood pergola purchased from Gumtree. Had to dismantle. -Fifteen- 90x90mm second hand hardwood Merbau posts bought off Gumtree and used on the deck. -Second hand triple glazed windows and doors used in the granny flat. -Used and recycled water-damaged hardwood flooring used for external wall cladding. -Two used mint condition bathroom vanities bought off Gumtree. -Existing fibreglass insulation used where possible. -Second hand fibre cement sheets bought off Gumtree for use on bathroom walls. -Used 8m café awning blind bought off Gumtree. -Lots of unused small items bought off Gumtree such as termite resistant silicones, polyurethane sealants and flooring adhesives. -Weather-stained decking bought off Gumtree and used for sealing off under the deck. -Used face bricks purchased from Sydney and used for the garage. -All other brickwork used in house construction uses cleaned-up bricks from the existing house. -Second-hand site fencing bought off Gumtree. -Used formwork ply bought from the recycle shed and used for formwork to the foundations and as temporary decking. -100, used, but as new 12mm ply sheets bought off Gumtree and used on the roof trusses. -Lots of second-hand, used or surplus timber bought off Gumtree. Particularly useful during the timber shortage. -And yes, I spend a lot of time on Gumtree.
    • Recycled and reused materials:
    • Appliances
      Bathroom cabinets
      Bricks
      Cladding
      Copper pipes/fittings
      Concrete
      Insulation
      Metal sheeting
      Paving
      Rocks/stone
      Steel frame
      Timber
      Windows
INSULATION SPECIFICATIONS
    • Insulation Type:
    • Under-roof
      External walls
      Floor
    • Floor Type:
    • Bulk - glass wool
    • Floor Rating:
    • 4.25
    • Under Roof Insulation Type:
    • Pump-in bulk insulation
    • Under Roof Insulation Rating:
    • 5.3
    • External Walls Rating:
    • 4.6
    • External Walls Type:
    • Bulk – glass wool
RENEWABLE ENERGY SPECIFICATIONS
    • All-Electric Home?
    • Yes
    • Renewable energy used:
    • Solar PV grid connect
    • Size of PV system:
    • 12.3
    • Average Daily Energy Consumption:
    • Building still under construction.
COSTS AND COST SAVINGS
    • Total cost of home when constructed:
    • 1,600,000
    • Cost estimate of sustainable home/features:
    • 450,000
    • Estimate of annual savings:
    • 90% reduction on heating and cooling.
HOUSE DESIGN SPECIFICATIONS
    • House Size
    • 280
    • Roof
    • Metal (Colorbond)
    • Wall Materials
    • Brick veneer
      Lightweight construction (timber frame)
      Metal (Colorbond)

    • Wall Materials
    • Compressed fibre cement sheet.
    • Window and Door Types
    • Low-e, films
      Sliding windows/doors
      Tilt and turn
      Triple glazing
    • Universal design accessability
    • Multi-generational
      Universal access
      Wheelchair accessible
    • Universal Design Features
    • 80cm minimum door opening width
      100cm minimum door opening width
      Hobless showers
      Lever handles for doors (no knobs)
      Loud doorbell/connected to flashing light
      No stairs/steps
      Ramps and path gradients must be less than 20:1
      Shower head on rail for various heights
      Slip resistant flooring
      Space around toilets for ease of access in wheelchairs
      Tapware to be easily accessed from outside the shower
    • Number of bedrooms
    • 5
    • Number of bathrooms
    • 3
GARDEN AND WASTE REDUCTION
    • Waste Reduction Practices:
    • Compost all food scraps
HEALTHY HOME FEATURES
    • Healthy home features
    • Airtight house design
      Automated ventilation system
      Cross flow ventilation
      Heat recovery ventilation (HRV)
      Natural light and ventilation
Location
Kambah ACT 2902
    • Housing Type:
    • Standalone House
    • Project Type:
    • Renovation
    • Builder
    • Owner Builder
    • Designer
    • Wombey Architects Pty Ltd

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