Outrigger / Tristram Ecohouse
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as PDF Outrigger is a new build 4 bedroom ecohouse located on a sloping site in Polzeath, Cornwall with far reaching views over the beach and sea. The architecture of the new house reflects the regional vernacular of the area utilising a similar form, scale and pallette of materials. The dwelling is traditionally constructed (high thermal mass) with high levels of natural daylight, a Ground Source Heat Pump (supplying underfloor heating and hot water (pre-heat)) and a Whole House Heat Recovery Ventilation System for owner occupation. Daily Telegraph Homebuilding & Renovating Award 2009 - Reader's Choice Winner.
Outrigger / Tristram Ecohouse : Project images
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Energy and fuel use
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | - | 15210 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 195 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | - | 46 kg CO₂/m².yr | - |
| Annual space heat demand | - | 20 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | - | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 195 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 46 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | |
|---|---|
| Other whole house calculation method | - |
| Energy target | AECB Silver |
| Other energy targets | - |
| Forecast heating load | 4.2 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | 10 March 2009 | 2.13m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | 10 March 2009 | 2.13m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 15 May 2009 |
| Occupation date | |
| Location | Polzeath Cornwall England |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Masonry Cavity |
| Other construction type | |
| Party wall construction | |
| Floor area | 195 m² |
| Floor area calculation method | Actual Floor Area (SAP) |
| Building certification |
Project Team
| Organisation | |
|---|---|
| Project lead person | |
| Landlord or Client | Mr & Mrs Webb |
| Architect | Mark Kingsley Architects |
| Mechanical & electrical consultant | Mark Kingsley Architects |
| Energy consultant | |
| Structural engineer | Whitby Bird |
| Quantity surveyor | |
| Consultant | |
| Contractor | Gynn Construction |
Design strategies
| Planned occupancy | 2 people permanent / 4 to 6 people occasional. |
|---|---|
| Space heating strategy | Ground source heat pump distributed via thermostatically controlled zonal wet underfloor heating system |
| Water heating strategy | Ground source heat pump pre-heat with electric. |
| Fuel strategy | Mains electricity. |
| Renewable energy strategy | Solar Thermal ready design. |
| Passive Solar strategy | Passive solar via south facing glazing. |
| Space cooling strategy | Low technology design. External blinds to south facing glazing, high thermal mass with natural stack airflow from basement up stairwell and out of H/L clerestorey windows. |
| Daylighting strategy | Open plan first floor living space achieves a minimum average daylight factor of at least 4%. All other rooms typically achieve an average daylight factor of at least 2%. |
| Ventilation strategy | Whole House Ventilation System with Heat Recovery (MVHR). |
| Airtightness strategy | Wet plaster coating to all internal masonry walls and between beam & block flooring beams. Vapour Control layer with taped joints to timber roof. |
| Strategy for minimising thermal bridges | Thermal bridges reduced to a minimum. |
| Modelling strategy | |
| Insulation strategy | |
| Other relevant retrofit strategies | |
| Contextual information |
Building services
| Occupancy | 2 people permanent / 4 to 6 people occasional. |
|---|---|
| Space heating | 6kW Kensa GSHP with 2 x 85m deep boreholes. |
| Hot water | GSHP pre-heat with thermostat. Shower Drain Exchanger. |
| Ventilation | Heat Recovery: Ubbink Medio throughout, advised efficiency of heat recovery 95% - (Netherlands standard NEN 5128) |
| Controls | Room thermostat, three set points for MVHR |
| Cooking | A+ Rated electric hob and oven. |
| Lighting | 75% LED and 25% compact fluorescent |
| Appliances | A+ Rated fridge freezer, washing machine and dish washer. |
| Renewable energy generation system | GSHP. Solar Thermal ready but currently not installed. |
| Strategy for minimising thermal bridges | Thermal bridge-free construction details throughout to no defined benchmarked standard. |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 592m³ |
| Thermal fabric area | 420 m² |
| Roof description | 175mm thick insulation between timber rafters (175 x 50mm) at 600mm centres. Originally EPS insulation K value 0.030W/mK amended to PUR insulation type YBS, Thermal-Flect Roof Board PUR Gold K value 0.023W/mK. Slate roof finish over with vapour control layer under tape fixed to soffit of rafters. |
| Roof U-value | 0.14 W/m² K |
| Walls description | 100mm thick insulation board in cavity. Originally EPS insulation K value 0.038W/mK amended to PUR insulation type YBS, Therma-Flect Wall Board PUR with bonded Foil Bubble outer K value 023W/mK. |
| Walls U-value | 0.19 W/m² K |
| Party walls description | N/A |
| Party walls U-value | 0.00 W/m² K |
| Floor description | 100mm thick under 65mm screed on concrete slab. Originally EPS insulation K value 0.030W/mK amended to PUR insulation type YBS, Superfloor Polyurethane K value 0.023W/mK. |
| Floor U-value | 0.14 W/m² K |
| Glazed doors description | Triple glazed centrally sliding door with fixed light either side. Timber / Aluminium combi with a projecting cam open / close action to ensure moving light fully engages with seals upon closing. |
| Glazed doors U-value | 1.20 W/m² K uninstalled |
| Opaque doors description | Wood / Aluminium flush doors with insulated core. |
| Opaque doors U-value | 0.74 W/m² K uninstalled |
| Windows description | Timber / Aluminium combi windows with Triple Glazed Units |
| Windows U-value | 1.38 W/m² K uninstalled |
| Windows energy transmittance (G-value) | 0.52 % |
| Windows light transmittance | 0.72% |
| Rooflights description | None. H/L windows used. |
| Rooflights light transmittance | 0.64% |
| Rooflights U-value | 2.03 W/m² K |