East Cambusmoon Farm - New House
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as PDF This new house replaced a run-down Victorian farmhouse, and re-attaches to a 150 year old adjacent barn. The house has four bedrooms, three bathrooms and is occupied by two adults and two young children. The site is in an exposed rural location in the west of Scotland with no shelter to previaling winds.
East Cambusmoon Farm - New House : 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 | - | 10548 kWh/yr | 7976 kWh/yr |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | 200 kWh/yr | - |
| Wood use | - | - | 3180 kWh/yr |
| bottled LPG | - | - | 697 kWh/yr |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 108 kWh/m².yr | 98 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | - | 26 kg CO₂/m².yr | 20 kg CO₂/m².yr |
| Annual space heat demand | - | 40 kWh/m².yr | 32 kWh/m².yr |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Solar PV | - | 830 kWh/yr |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 108 kWh/m².yr | 90 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 26 kg CO₂/m².yr | 18 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | OTHER |
|---|---|
| Other whole house calculation method | Self developed spreadsheet. |
| Energy target | AECB Silver |
| Other energy targets | None |
| Forecast heating load | 14 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | 15 April 2008 | 4.8m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 01 September 2008 |
| Occupation date | 01 May 2012 |
| Location | Gartocharn, Loch Lomond Strathclyde Scotland |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Softwood frame |
| Other construction type | Hybrid timber frame (over-clad TF with service void) |
| Party wall construction | n/a |
| Floor area | 246 m² |
| Floor area calculation method | Actual Floor Area (SAP) |
| Building certification |
Project Team
| Organisation | Steve and Deborah Macken |
|---|---|
| Project lead person | Steve and Deborah Macken |
| Landlord or Client | Steve and Deborah Macken |
| Architect | Thomas Robinson Architects, Blanefield |
| Mechanical & electrical consultant | Steve Macken |
| Energy consultant | Ecoliving and Anderson Floor Warming, Glasgow |
| Structural engineer | Hannah Reed, Glasgow |
| Quantity surveyor | n/a |
| Consultant | n/a |
| Contractor | Robert Chalmers Builders, Lenzie |
Design strategies
| Planned occupancy | 4 people |
|---|---|
| Space heating strategy | Underfloor heating on ground floor and 1st floor bathrooms only. Bathrooms all have 150W electric towel radiators. Wood stove in living room for additional comfort/cosiness in winter. |
| Water heating strategy | All from ground source heat pump. |
| Fuel strategy | Maily electricty and occassionally wood during cold winter evenings only. |
| Renewable energy strategy | 1.08kWpk grid connected solar PV installed on woodshed roof. This has been replaced with a 3.6kW solar PV asystem in December 2011. |
| Passive Solar strategy | Glazing maximised on south and west facing rooms, these being main living spaces. |
| Space cooling strategy | High thermal mass concrete floor slab. |
| Daylighting strategy | 53% glazing WNW elevation (daytime and evening living space), 31% SSW elevation (main daytime living space) and 16% ESE elevation (mainly circulation areas). |
| Ventilation strategy | MVHR, high level rooflights opened during very hot days to induce passive stack ventilation. |
| Airtightness strategy | OSB and polyethylene membrane with taped and batten trapped joints with 25mm service void. |
| Strategy for minimising thermal bridges | Floor - concrete slab supported on minimum area of thermal blocks and 200mm polystyrene.. Walls - External overcladding of timber frame with 60mm T&G woodfibre board; Roof - I-beam rafters. |
| Modelling strategy | Calculations in self-developed spreadsheet. |
| Insulation strategy | 200mm polystyrene under 150mm concrete raft floor, 140mm Rockwool flexi + 60mm Pavertherm Plus for external walls, 350mm Rockwool Flexi between i-beam roof rafters. |
| Other relevant retrofit strategies | n/a |
| Contextual information |
Building services
| Occupancy | Occupied most days of the week as the owners woork from home. |
|---|---|
| Space heating | 5kW ground source heat pump using 300m single circuit groud loop located in adjacent field. |
| Hot water | Ground source heat pump as above. |
| Ventilation | MVHR |
| Controls | Internal thermostat and external weather compensation thermostat. |
| Cooking | Gas (bottled LPG) hob, electric oven and microwave oven. |
| Lighting | 80% (by fittings) compact flourescent, 10% LED and 10% tungsten filament (cupboards, task lighting). |
| Appliances | A+ rated fridge-freezer, A rated washing machine, A rated tumble dryer, A rated oven and microwave. |
| Renewable energy generation system | 1.08kWpk solar PV grid connected when built, now 3.6kW. |
| Strategy for minimising thermal bridges | Over-cladding of timber frame with woodfibre board. |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 1500m³ |
| Thermal fabric area | 547 m² |
| Roof description | 45 degree pitched roof. Ridge-beam and rafter construction with ridge beam supported on steel portal frames. 15mm plasterboard over poyethylene air-vapour membrane on 356mm deep timber I-beam rafters at 400mm centres fully filled with Rockwool Flexi; softwood sarking board, breather membrane and natural slate finish. |
| Roof U-value | 0.12 W/m² K |
| Walls description | 15mm taped plasterboard on 25mm battens to form service void; polyethylene air-vapour membrane taped and mechanically trapped below battens; 9mm OSB on 140mm studs fully filled with Rockwool Flexi; continuous T&G Pavatherm Plus woodfibre board with breather membrane. Part clad in untreated north European larch, otherwise rendered brick. |
| Walls U-value | 0.19 W/m² K |
| Party walls description | n/a |
| Party walls U-value | 0.00 W/m² K |
| Floor description | 150mm concrete slab on 200mm polystyrene, supported at edges on footings via thermal blocks. |
| Floor U-value | 0.14 W/m² K |
| Glazed doors description | Timber framed sliding door units; low-e argon filled 16mm glazing units. |
| Glazed doors U-value | 1.50 W/m² K installed |
| Opaque doors description | Timber framed with insulated security panel. |
| Opaque doors U-value | 1.50 W/m² K installed |
| Windows description | Timbr framed, low-e argon filled glazing units with 16mm gap. |
| Windows U-value | 1.40 W/m² K installed |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | - |
| Rooflights description | Velux timber framed double glazed windows. |
| Rooflights light transmittance | - |
| Rooflights U-value | 1.50 W/m² K |