Retrofit of Victorian mid-terrace in Salford
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as PDF This was a renovation project of a solid-walled house built around 1900, located in Salford, Greater Manchester. The work included both energy efficiency retrofit measures (e.g. insulation, MVHR) in tandem with other work as part of the renovation.The energy efficiency measures revolved largely around insulation, airtightness and ventilation.
Retrofit of Victorian mid-terrace in Salford : Project images
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Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | - | - | 1319 kWh/yr |
|---|---|---|---|
| Natural gas use | - | - | 3060 kWh/yr |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | - | 97 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | - | - | 20 kg CO₂/m².yr |
| Annual space heat demand | - | 84 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 | - | 97 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | - | 20 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | |
| Other energy targets | - |
| Forecast heating load | 41 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | 02 May 2009 | 7.85m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Occupied |
|---|---|
| Start date | 01 January 2008 |
| Occupation date | 30 April 2011 |
| Location | Salford Manchester England |
| Build type | Refurbishment |
| Building sector | Private Residential |
| Property type | Mid Terrace |
| Construction type | Solid Brick |
| Other construction type | |
| Party wall construction | 230mm solid brick |
| Floor area | 70.26 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | |
|---|---|
| Project lead person | Eric Fewster |
| Landlord or Client | Eric Fewster |
| Architect | |
| Mechanical & electrical consultant | |
| Energy consultant | |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor |
Design strategies
| Planned occupancy | Two people working and living in the house. |
|---|---|
| Space heating strategy | Heating to be from mains gas-fired boiler feeding radiators; heat recovered from ventilation exhaust; wood-burning stove to be installed at ground floor level. |
| Water heating strategy | Water heated using mains gas-fired boiler only. |
| Fuel strategy | Mains gas, mains electricity (but from 100% renewable supplier). |
| Renewable energy strategy | |
| Passive Solar strategy | |
| Space cooling strategy | |
| Daylighting strategy | |
| Ventilation strategy | MVHR unit to be installed, openable windows for summer. |
| Airtightness strategy | Airtightness to be achieved using attention to detail at all parts of renovation process - gaps filled using expanding foam at all points (e.g. around windows, services entry/exit points, between all solid insulation boards, at top of stud wall that opened into loft, between ceiling plasterboards in loft, at all electric cable entry points in loft etc). |
| Strategy for minimising thermal bridges | |
| Modelling strategy | |
| Insulation strategy | Polyisocyanurate board insulation to be friction-fitted in timber studwork at the following places: Internal walls on external-facing elevations, suspended timber ground floor, and bathroom ceiling. Mineral wool insulation for the loft space. |
| Other relevant retrofit strategies | |
| Contextual information | This project was carried out by myself as an individual after having done some reading and research. Some of it was done by builders, other parts I did myself. The expected sequence of work and what was actually implemented in the end did change over time with better understanding of what had to happen before something else, and also some compromises were made on materials due to budget available as the work progressed (e.g. DG PVC windows rather than triple-glazed wood frame windows). |
Building services
| Occupancy | One person living and working full time in the house, but only at some times of the year - e.g. for 62% of the period quoted for the fuel usage (i.e. 26 October 2010 to 23 November 2011) there was someone in the house. |
|---|---|
| Space heating | Heating from mains gas-fired boiler feeding radiators; heat recovered from ventilation exhaust; wood-burning stove to be installed at ground floor level (but rarely used). |
| Hot water | Water heated using mains gas-fired boiler only. |
| Ventilation | Xpelair Xcell-300 MVHR unit with 91% heat recovery installed, trickle vents and windows openable for summer. |
| Controls | Three-way controller for MVHR. |
| Cooking | Electric oven & microwave, gas hob. |
| Lighting | 90% compact fluorescent or LEDs. |
| Appliances | A-rated fridge, freezer, microwave and washing machine. |
| Renewable energy generation system | None. |
| Strategy for minimising thermal bridges | On internal wall insulation, floor boards taken up from first floor and polyisocyanurate boards added between joists, also insulation continued into stud wall connection to external-facing wall. |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 176m³ |
| Thermal fabric area | 270 m² |
| Roof description | 270mm mineral wool put in loft space, 120mm phenolic foam between batons in bathroom roof. |
| Roof U-value | 0.18 W/m² K |
| Walls description | 70mm phenolic foam between studwork on internal faces of external elevations. |
| Walls U-value | 0.40 W/m² K |
| Party walls description | Solid brick left as it was - only plastering done. |
| Party walls U-value | 1.58 W/m² K |
| Floor description | 100mm phenolic foam between joists in suspended timber ground floor. |
| Floor U-value | 1.14 W/m² K |
| Glazed doors description | Back door to yard is 28mm gap argon-filled double-glazed door. |
| Glazed doors U-value | 2.30 W/m² K installed |
| Opaque doors description | Front door is a composite door. |
| Opaque doors U-value | 1.70 W/m² K uninstalled |
| Windows description | 28mm gap argon-filled double-glazed windows. |
| Windows U-value | 2.20 W/m² K installed |
| Windows energy transmittance (G-value) | 72 % |
| Windows light transmittance | - |
| Rooflights description | One velux window installed in bathroom. |
| Rooflights light transmittance | 56% |
| Rooflights U-value | 1.98 W/m² K |