1970s Lancaster retrofit
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as PDF Retrofit of 1970s semi-detached house using IWI. Designed, built and certified to the AECB Retrofit Standard - Level 2.
1970s Lancaster retrofit : 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 | 2199 kWh/yr | 2310 kWh/yr | - |
|---|---|---|---|
| Natural gas use | 16521 kWh/yr | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | 1955 kWh/yr | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 363 kWh/m².yr | 79 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 64 kg CO₂/m².yr | 19 kg CO₂/m².yr | - |
| Annual space heat demand | 189 kWh/m².yr | 44 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | 4084 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | -60 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | -14 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | AECB Retrofit Standard - Level 2 |
| Other energy targets | AECB Retrofit Standard - Level 2 |
| Forecast heating load | 22.8 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | 04 May 2021 | 1.36m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 01 June 2019 |
| Occupation date | 01 May 2021 |
| Location | Lancaster Lancashire England |
| Build type | Refurbishment |
| Building sector | Private Residential |
| Property type | Semi-Detached |
| Construction type | Masonry Cavity |
| Other construction type | 60mm cavity with existing EPS beads |
| Party wall construction | |
| Floor area | 73.5 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |  AECB silver standard certified building |
Project Team
| Organisation | ColdProof / Haus Martins |
|---|---|
| Project lead person | Eric Fewster |
| Landlord or Client | Wendy Pattinson |
| Architect | n/a |
| Mechanical & electrical consultant | Adam Dadeby (MVHR), Chris Wilde (heating/DHW) |
| Energy consultant | Eric Fewster (ColdProof) |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor | Gideon & Saul Martin (Haus Martins) |
Design strategies
| Planned occupancy | 2 people - occupancy selected as automatic in PHPP |
|---|---|
| Space heating strategy | Air source heat pump with underfloor heating |
| Water heating strategy | Air source heat pump |
| Fuel strategy | Electricity |
| Renewable energy strategy | Existing 19 solar PV panels generating 4,084 kWh/a |
| Passive Solar strategy | |
| Space cooling strategy | Using openable windows in summer |
| Daylighting strategy | |
| Ventilation strategy | MVHR |
| Airtightness strategy | Airtight membrane for ceilings and in front of wood fibre IWI. Plaster layer in front of Spacetherm and for partition walls. Screed for floor. Relevant tapes used for junctions (plasterable, non-plasterable). |
| Strategy for minimising thermal bridges | Thermal bridge modelling done for all relevant junctions, with heat loss reduced where this was possible to be mitigated. Certain junctions (e.g. party/partition wall to external wall, and partition wall to ground) remain as thermal bridges, with relevant ps-values entered in PHPP. |
| Modelling strategy | Baseline and post-retrofit modelling done in PHPP. |
| Insulation strategy | Existing 60mm cavity wall filled with EPS beads, with 100mm wood fibre IWI on most walls, but some (e.g. stairwell, bathroom) having thinner Spacetherm boards (20mm aerogel on plasterboard). Average u-value walls: 0.23 W/m2K.Suspended floor removed, replaced with 200mm EPS with screed/UFH, OSB and floorboards over. U-value floors: 0.17 W/m2K.Loft insulation topped up to 390mm of mineral wool. Roof u-value: 0.103 W/m2K. |
| Other relevant retrofit strategies | |
| Contextual information |
Building services
| Occupancy | 2 people - occupancy selected as automatic in PHPP |
|---|---|
| Space heating | Air source heat pump with underfloor heating |
| Hot water | Air source heat pump |
| Ventilation | MVHR - Brink Renovent Sky 150, installed efficiency stated in PHPP of 74.9% |
| Controls | 4 speeds available via digital controller for MVHR |
| Cooking | Electricity |
| Lighting | Mostly low energy bulbs |
| Appliances | Dishwasher, washing machine, condensation dryer, 1 x freezer, 1 x fridge-freezer |
| Renewable energy generation system | 19 solar PV panels generating 4084 kWh/a |
| Strategy for minimising thermal bridges | Thermal bridge modelling done for all relevant junctions, with heat loss reduced where this was possible to be mitigated. Certain junctions (e.g. party/partition wall to external wall, and partition wall to ground) remain as thermal bridges, with relevant psi-values entered in PHPP. |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 182m³ |
| Thermal fabric area | 246 m² |
| Roof description | Loft insulation topped up to 390mm of mineral wool. |
| Roof U-value | 0.10 W/m² K |
| Walls description | Existing 60mm cavity wall filled with EPS beads, with 100mm wood fibre IWI on most walls, but some (e.g. stairwell, bathroom) having thinner Spacetherm boards (20mm aerogel on plasterboard). |
| Walls U-value | 0.23 W/m² K |
| Party walls description | Plastered 100mm concrete block either side of 80mm unfilled cavity |
| Party walls U-value | 1.32 W/m² K |
| Floor description | Suspended floor removed, replaced with 200mm EPS with screed/UFH, OSB and floorboards over. |
| Floor U-value | 0.17 W/m² K |
| Glazed doors description | Existing PVC |
| Glazed doors U-value | 1.56 W/m² K installed |
| Opaque doors description | Green Building Store Performance |
| Opaque doors U-value | 1.10 W/m² K uninstalled |
| Windows description | Existing PVC |
| Windows U-value | 1.60 W/m² K - |
| Windows energy transmittance (G-value) | 0.48 % |
| Windows light transmittance | - |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | - |