Redlands
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as PDF Deep retrofit of 1955 brick house in Devon based on EnerPHit standard. House had old gas boiler, double glazing, cavity wall insulation and c. 100mm mineral wool loft insulation.
Redlands : Project images
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Energy and fuel use
Renewable electricity generation This project has used the contributions from renewable electricity generation equipment to either meet the Retrofit for the Future target or otherwise reduce the Primary energy requirement and CO₂ emissions associated with the project.
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | 3425 kWh/yr | 1860 kWh/yr | 1983 kWh/yr |
|---|---|---|---|
| Natural gas use | 22133 kWh/yr | 8217 kWh/yr | 6775 kWh/yr |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | 1600 kWh/yr | 2193 kWh/yr |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 227 kWh/m².yr | 106 kWh/m².yr | 101 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | 44 kg CO₂/m².yr | 19 kg CO₂/m².yr | 17 kg CO₂/m².yr |
| Annual space heat demand | 140 kWh/m².yr | 31 kWh/m².yr | 25 kWh/m².yr |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| PV | 2195 kWh/yr | 1771 kWh/yr |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 69 kWh/m².yr | 71 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 10 kg CO₂/m².yr | 10 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | EnerPHit |
| Other energy targets | - |
| Forecast heating load | 21 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | 10 June 2012 | 4.5m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 15 August 2011 |
| Occupation date | 19 December 2011 |
| Location | Crediton Devon England |
| Build type | Refurbishment |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Masonry Cavity |
| Other construction type | Brick and block cavity wall |
| Party wall construction | none |
| Floor area | 150 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | |
|---|---|
| Project lead person | Rob Rickey |
| Landlord or Client | Rob and Karen Rickey |
| Architect | Rob Rickey |
| Mechanical & electrical consultant | |
| Energy consultant | Warm Associates |
| Structural engineer | Barry Honeysett |
| Quantity surveyor | |
| Consultant | |
| Contractor | Simon Mildon |
Design strategies
| Planned occupancy | Two people plus; mixed work schedule |
|---|---|
| Space heating strategy | Heating from mains gas fired boiler feeding existing radiators; supplementary woodburner for space heating only |
| Water heating strategy | Gas boiler; solar collector planned but not implemented |
| Fuel strategy | Mains gas. Mains electricity. |
| Renewable energy strategy | 2.9 kWp PV array on studio |
| Passive Solar strategy | Increase glazing area to south. Reduce existing glazing area to all other elevations |
| Space cooling strategy | Natural ventilation for most of the cooling season. Daytime use of MVHR with night purging during heat waves. |
| Daylighting strategy | Raise ceiling in sitting room to raise head of patio doors. Not calculated |
| Ventilation strategy | MVHR plus natural ventilation. |
| Airtightness strategy | Existing plaster connected to ceiling membrane above first floor. Suspended timber floor replaced with plywood- joints taped and boards taped to plaster on external walls. Wall between first floor joists parged and joists taped to parging. |
| Strategy for minimising thermal bridges | External wall insulation. Plasterboard fillet with insulation added to first floor ceiling to minimise thermal bridge at loft insulation junction. Insulated plasterboard added to window reveals. |
| Modelling strategy | PHPP |
| Insulation strategy | External wall insulation installed. Loft insulation increased. suspended timber floor insulated with sheeps wool. |
| Other relevant retrofit strategies | |
| Contextual information |
Building services
| Occupancy | 2 persons - mixed work schedule |
|---|---|
| Space heating | Mains gas and woodburner |
| Hot water | Gas boiler |
| Ventilation | MVHR |
| Controls | room thermostat. Standard and boost for MVHR |
| Cooking | Gas hob. Electric oven. Microwave |
| Lighting | 100% compact fluorescent |
| Appliances | A+ rated fridge |
| Renewable energy generation system | 2.9 kWh PV array |
| Strategy for minimising thermal bridges | Psi values have been calculated for internal and external values. External psi-value have been entered into PHPP. |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 579m³ |
| Thermal fabric area | 353 m² |
| Roof description | Clay tile roof - loft insulation |
| Roof U-value | 0.09 W/m² K |
| Walls description | Masonry cavity wall with cavity insulation and 180mm platinum EPS insulation |
| Walls U-value | 0.12 W/m² K |
| Party walls description | |
| Party walls U-value | - |
| Floor description | Suspended timber floor with sheepswool. Partial concrete floor with edge insulation only |
| Floor U-value | 0.44 W/m² K |
| Glazed doors description | Triple glazed timber doors - Rationel |
| Glazed doors U-value | 0.69 W/m² K installed |
| Opaque doors description | |
| Opaque doors U-value | - - |
| Windows description | Triple glazed timber. Rationel Aura |
| Windows U-value | 0.90 W/m² K - |
| Windows energy transmittance (G-value) | 0.51 % |
| Windows light transmittance | 0.72% |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | - |