Wahroonga
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as PDF Wahroonga is a recently completed passivhaus in Ledbury, Herefordshire. The timber frame insulated with a mixture of sheeps wool and Warmcell sits on a 200mm reinforced concrete slab insulated below with 300mm EPS. Heating is provided by a conventional gas central heating system. Natural lighting has been emphasized by providing daylight from at least two sides in each room. Certified Passivhaus windows (Alphawin Uw= 0.68 W/mK) and doors (Alu2Wood Uw= 0.77 W/m2K) have timber frames clad externally in aluminium. The MVHR unit (Paul Novus 300) is located outside the thermal envelope in a small single storey extension to the rear of the house; Water-saving and A+ rated appliances, micro-bore hot-water piping, low energy lighting throughout. Externally, lime render and untreated local douglas fir cladding. Reclaimed Welsh slate roof tiles with integrated 5m2 Velux solar thermal panels on the SE roof. Two small green roofs on the single storey porch and MVHR unit extension.
Wahroonga : Project images
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Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | - | - | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | - | - |
|---|---|---|---|
| Annual CO₂ emissions | - | - | - |
| Annual space heat demand | - | - | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | - | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | - | - |
| Annual CO₂ emissions offset by renewable generation | - | - |
Calculation and targets
| Whole house energy calculation method | |
|---|---|
| Other whole house calculation method | - |
| Energy target | |
| Other energy targets | - |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Occupied |
|---|---|
| Start date | |
| Occupation date | 01 June 2012 |
| Location | Ledbury Herefordshire England |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Softwood frame |
| Other construction type | |
| Party wall construction | |
| Floor area | 129 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |  Passivhaus certified building |
Project Team
| Organisation | CT&T Architects |
|---|---|
| Project lead person | Janet Cotterell |
| Landlord or Client | Ruth Busbridge |
| Architect | Janet Cotterell (CT&T architects, London & Passivhaus Homes) |
| Mechanical & electrical consultant | |
| Energy consultant | Nick Grant & Alan Clarke |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor | Mike Whitfield (Mike Whitfield Construction) |
Design strategies
| Planned occupancy | |
|---|---|
| Space heating strategy | |
| Water heating strategy | |
| Fuel strategy | |
| Renewable energy strategy | |
| Passive Solar strategy | |
| Space cooling strategy | |
| Daylighting strategy | |
| Ventilation strategy | |
| Airtightness strategy | |
| Strategy for minimising thermal bridges | |
| Modelling strategy | |
| Insulation strategy | |
| Other relevant retrofit strategies | |
| Contextual information |
Building services
| Occupancy | |
|---|---|
| Space heating | |
| Hot water | |
| Ventilation | |
| Controls | |
| Cooking | |
| Lighting | |
| Appliances | |
| Renewable energy generation system | |
| Strategy for minimising thermal bridges |
Building construction
| Storeys | |
|---|---|
| Volume | - |
| Thermal fabric area | - |
| Roof description | |
| Roof U-value | - |
| Walls description | |
| Walls U-value | - |
| Party walls description | |
| Party walls U-value | - |
| Floor description | |
| Floor U-value | - |
| Glazed doors description | |
| Glazed doors U-value | - - |
| Opaque doors description | |
| Opaque doors U-value | - - |
| Windows description | |
| Windows U-value | - - |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | - |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | - |