Rural solid wall terrace house - 80% carbon emission reduction through whole house upgrade approach using innovative technologies
Download
as PDF Existing: Solid brick walls (430mm); Slate roof; Projecting stair hall (half brick walls); Rear kitchen extension. Proposed: Separate hall from the heated envelope (retain as draft lobby only) & change stair to discharge into l/room; Insulate & dry line house & kitchen walls; Increase roof insulation to 350mm; Insulate kitchen roof; Insulated floating floor with u/floor heating in l/room & kitchen; Triple glazed composite windows; GSHP serving u/floor heating; LED lights with 50k hours guaranteed max light output; Sun pipe to f/floor landing; Decentralised whole house ventilation system; 1.0kWp PV;Solar thermal panel; Shower water heat recovery; Reduced water consumption; Smoke alarm system; AA++ appliances; Smart metering with display.
Retrofit for the future ZA146G
Rural solid wall terrace house - 80% carbon emission reduction through whole house upgrade approach using innovative technologies : Project images
Click on image to preview full size
Energy and fuel use
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | 5474 kWh/yr | 4020 kWh/yr | 5503 kWh/yr |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| house coal | 21772 kWh/yr | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 430 kWh/m².yr | 117 kWh/m².yr | 160 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | 134 kg CO₂/m².yr | 28 kg CO₂/m².yr | 38 kg CO₂/m².yr |
| Annual space heat demand | - | 56 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| 1.0kWp PV | 797.5999756 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 94 kWh/m².yr | 160 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 23 kg CO₂/m².yr | 38 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | SAP |
|---|---|
| Other whole house calculation method | - |
| Energy target | Retrofit for the Future |
| Other energy targets | - |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | 8.06m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | 10.92m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 March 2010 |
| Occupation date | 16 April 2010 |
| Location | Sea Palling Norfolk England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Mid Terrace |
| Construction type | Solid Brick |
| Other construction type | 430mm thick solid brick |
| Party wall construction | 215mm solid brick plastered both sides |
| Floor area | 86 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Victory Housing Trust |
|---|---|
| Project lead person | Victory Housing Association |
| Landlord or Client | Victory Housing Association |
| Architect | PRP Architects |
| Mechanical & electrical consultant | N/A |
| Energy consultant | PRP Environmental |
| Structural engineer | Scott Wilson |
| Quantity surveyor | |
| Consultant | CDM Coordinator: PRP Project Services |
| Contractor | Hill Partnerships Ltd |
Design strategies
| Planned occupancy | Currently empty, but potential for 3 or 4 person family home. |
|---|---|
| Space heating strategy | Ground source heat pump serving under floor heating. |
| Water heating strategy | Solar thermal and GSHP |
| Fuel strategy | Solar thermal and GSHP hot water, PV panels and mains electricity |
| Renewable energy strategy | 1.0kWp photovoltaic panel |
| Passive Solar strategy | The house faces north east and the original window openings are small, but in proportion with the age and style of the property. There is no proposal to change window sizes. Glazing will be specified to compensate for potential overheating. |
| Space cooling strategy | Natural cooling via openable windows. Adjustments to glazing G-values to guard against overheating |
| Daylighting strategy | Existing windows will remain with a sun pipe added to illuminate the landing. |
| Ventilation strategy | Natural ventilation via openable windows, plus decentralised whole house ventilation system using continuously running low energy fans drawing air out through wet rooms. |
| Airtightness strategy | The property is close to the sea and will be subject to severe winds both infiltrating the house as well as drawing air out through any openings. A major air leakage point is the half brick thick stair hall; air tightness will be improved by changing this into an entrance lobby separated form the rest of the house. Improved seals around windows. Draught sealing around loft hatch. Careful attention to detail and sealing joints when installing dry lining. Ventilation equipment checked for air leakage prior to commissioning. Careful detailing around sockets and all other penetrations. Instruction to operatives on best practice at contract stage. Air proof films are not proposed due to the risk of sweating and mould growth. |
| Strategy for minimising thermal bridges | Minimisation of thermal bridges at design stage by careful detailing of all material and component junctions to ensure continuity of insulation and thermal performance. Continuation of dry lining along internal return walls. Insulation of new 'floating' ground floor and exposed areas of first floor adjacent to external walls. Instruction to operatives on best practice and careful site monitoring during construction. |
| Modelling strategy | Whole house modelling was undertaken using SAP (with NHER Plan Assessor software) in conjunction with the Extended SAP worksheet. AutoCAD produced plans and elevations were used to assist with visualisation and detailed design. |
| Insulation strategy | Ground floor - new timber suspended in living room, 25mm nanogel blanket Resultant U-value W/m2K 0.43 Exposed front & rear walls - 65mm nanogel foam internal insulation Resultant U-value W/m2K 0.17 Kitchen extension walls - 40mm nanogel foam internal insulation Resultant U-value W/m2K 0.28 Pitched roofs with flat ceiling - Top up to 350mm mineral fibre quilt Resultant U-value W/m2K 0.12 Flat roof over rear kitchen - 100mm phenolic foam overlay with 30mm nanogel foam internal insulation Resultant U-value W/m2K 0.15 Windows and doors Replacement uPVC triple glazed low-e Resultant U-value W/m2K 1.1 |
| Other relevant retrofit strategies | Our proposals are designed to be carried out with the present resident remaining in occupation. Considering the wider application of Retrofit it will be neither practical nor economically viable on a large scale to decant residents while the work is in progress. Pre commencement discussion and engagement with residents, plus regular monitoring during and after the works, will help to minimise the degree of inevitable inconvenience. |
| Contextual information | Proposals have been selected to address the challenge of achieving CO2 reductions in a small house in a semi rural area, specifically where the property is not connected to the gas network. We propose to demonstrate that location and small size need not preclude the use of renewable technologies such as ground source heat pumps. In this particular location the landlord owns open ground in front of the house suitable for a heat pump to serve the whole terrace. The other houses are currently on oil heating. |
Building services
| Occupancy | NULL |
|---|---|
| Space heating | NULL |
| Hot water | NULL |
| Ventilation | NULL |
| Controls | NULL |
| Cooking | NULL |
| Lighting | NULL |
| Appliances | NULL |
| Renewable energy generation system | NULL |
| Strategy for minimising thermal bridges | NULL |
Building construction
| Storeys | |
|---|---|
| Volume | - |
| Thermal fabric area | - |
| Roof description | NULL |
| Roof U-value | 0.00 W/m² K |
| Walls description | NULL |
| Walls U-value | 0.00 W/m² K |
| Party walls description | NULL |
| Party walls U-value | 0.00 W/m² K |
| Floor description | NULL |
| Floor U-value | 0.00 W/m² K |
| Glazed doors description | NULL |
| Glazed doors U-value | 0.00 W/m² K - |
| Opaque doors description | NULL |
| Opaque doors U-value | 0.00 W/m² K - |
| Windows description | NULL |
| Windows U-value | 0.00 W/m² K - |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | - |
| Rooflights description | NULL |
| Rooflights light transmittance | - |
| Rooflights U-value | 0.00 W/m² K |