Summerfold, The Spinning Walk
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as PDF A detached house to the Passivhaus standard, built in a traditional style in keeping with the village vernacular. Offsite closed panel timber frame construction on an ICF basement.
Summerfold, The Spinning Walk : 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 | - | 2500 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | 6000 kWh/yr | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | 1500 kWh/yr | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 80 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | - | 15 kg CO₂/m².yr | - |
| Annual space heat demand | - | 15.3 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 | 80 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 15 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | PassivHaus |
| Other energy targets | - |
| Forecast heating load | 8.5 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | 13 June 2014 | 0.45m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 March 2013 |
| Occupation date | 25 July 2014 |
| Location | Shere, Guildford Surrey England |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Softwood frame |
| Other construction type | Blown cellulose insulation with cavity face brick/stonework |
| Party wall construction | |
| Floor area | 185.5 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |  AECB silver standard certified building |
Project Team
| Organisation | Cocreate Consulting |
|---|---|
| Project lead person | Will South |
| Landlord or Client | Low Energy Developments |
| Architect | JAG Architechs |
| Mechanical & electrical consultant | subcontractor design |
| Energy consultant | Cocreate Consulting |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor | Low Energy Developments, Ecohomes (Ireland), Integraspec ICF |
Design strategies
| Planned occupancy | Between 2 and 6 full time residents, design amended during construction for 2 full time residents. |
|---|---|
| Space heating strategy | Condensing gas fired system boiler feeding a thermal store and steel panel radiators. |
| Water heating strategy | Condensing gas fired system boiler feeding a thermal store. Radial microbore distribution pipework. |
| Fuel strategy | Mains Gas |
| Renewable energy strategy | None |
| Passive Solar strategy | Large double storey lightwell to ground floor and basement to make use of limited solar gain to site. |
| Space cooling strategy | Large deciduous tree in front of house. Secure openings to quiet and private gardens, and rooflight at the top of stair well. |
| Daylighting strategy | |
| Ventilation strategy | Brink Renovent 300 Ventilation with heat recovery. Manifold and semi-flexible ductwork distribution |
| Airtightness strategy | 15mm OSB with junctions taped |
| Strategy for minimising thermal bridges | |
| Modelling strategy | PHPP |
| Insulation strategy | ICF basement with additional external EPS. I-joist timber frame by Ecohomes above ground, fully filled with Cellulose insulation blown on site. Cold roof with blown Cellulose insulation. |
| Other relevant retrofit strategies | |
| Contextual information | Very strict local planning laws in the Surrey Hills AONB and green belt. Site gently slopes to the North and has excellent views in this direction. |
Building services
| Occupancy | 2 residents full time |
|---|---|
| Space heating | SEDBUK A rated mains gas condensing system boiler feeding thermal store. Flat panel radiators. |
| Hot water | SEDBUK A rated mains gas condensing system boiler feeding thermal store. Plastic microbore radial distribution from manifold next to tank. |
| Ventilation | Whole house ventilation with heat recovery (MVHR). Passivhaus Certified Brink Renovent 300 unit (84% efficiency). Distribution to manifold and semi flexible U-bink ducting. Recirculating cooker hood in kitchen. |
| Controls | Three stage fan controller in plant room. |
| Cooking | Gas hob and electric oven |
| Lighting | |
| Appliances | |
| Renewable energy generation system | |
| Strategy for minimising thermal bridges |
Building construction
| Storeys | 3 |
|---|---|
| Volume | 528m³ |
| Thermal fabric area | 568 m² |
| Roof description | Half 'room in the roof' truss roof, fully filled with blown cellulose insulation. |
| Roof U-value | 0.09 W/m² K |
| Walls description | Basement ICF with additional EPS external insulation. Above ground closed panel timber frame fully filled with blown cellulose insulation. Cavity and face brick/stone work, hung tiles to first floor. |
| Walls U-value | 0.09 W/m² K |
| Party walls description | |
| Party walls U-value | - |
| Floor description | Floating structural raft using EPS formwork foundation system. |
| Floor U-value | 0.11 W/m² K |
| Glazed doors description | Rationel french doors |
| Glazed doors U-value | - installed |
| Opaque doors description | |
| Opaque doors U-value | 1.40 W/m² K installed |
| Windows description | Rationel Aura windows |
| Windows U-value | 0.90 W/m² K installed |
| Windows energy transmittance (G-value) | 50 % |
| Windows light transmittance | - |
| Rooflights description | Fakro U6 triple glazed rooflight |
| Rooflights light transmittance | 50% |
| Rooflights U-value | 1.14 W/m² K |