East Cambusmoon Farm - New House

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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.
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East Cambusmoon Farm - New House : Project images

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CO2 emissionsPrimary energy requirement
Energy target
AECB Silver

Energy and fuel use

Fuel use by type
Primary energy requirement
CO2 emissions

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

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
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 generationForecastMeasured
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 methodSelf developed spreadsheet.
Energy target AECB Silver
Other energy targetsNone
Forecast heating load 14 W/m² demand


Pre-development air permeability test--
Final air permeability test15 April 20084.8m³/m².hr @ 50 Pascals

Project description

Start date01 September 2008
Occupation date01 May 2012
Location Gartocharn, Loch Lomond Strathclyde  Scotland
Build typeNew build
Building sectorPrivate Residential
Property typeDetached
Construction typeSoftwood frame
Other construction typeHybrid timber frame (over-clad TF with service void)
Party wall constructionn/a
Floor area 246
Floor area calculation method Actual Floor Area (SAP)
Building certification

Project Team

OrganisationSteve and Deborah Macken
Project lead personSteve and Deborah Macken
Landlord or ClientSteve and Deborah Macken
ArchitectThomas Robinson Architects, Blanefield
Mechanical & electrical consultant Steve Macken
Energy consultantEcoliving and Anderson Floor Warming, Glasgow
Structural engineerHannah Reed, Glasgow
Quantity surveyorn/a
ContractorRobert Chalmers Builders, Lenzie

Design strategies

Planned occupancy4 people
Space heating strategyUnderfloor 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 strategyAll from ground source heat pump.
Fuel strategyMaily electricty and occassionally wood during cold winter evenings only.
Renewable energy strategy1.08kWpk grid connected solar PV installed on woodshed roof. This has been replaced with a 3.6kW solar PV asystem in December 2011.
Passive Solar strategyGlazing maximised on south and west facing rooms, these being main living spaces.
Space cooling strategyHigh thermal mass concrete floor slab.
Daylighting strategy53% glazing WNW elevation (daytime and evening living space), 31% SSW elevation (main daytime living space) and 16% ESE elevation (mainly circulation areas).
Ventilation strategyMVHR, 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 strategyCalculations in self-developed spreadsheet.
Insulation strategy200mm 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 strategiesn/a
Contextual information

Building services

OccupancyOccupied most days of the week as the owners woork from home.
Space heating5kW ground source heat pump using 300m single circuit groud loop located in adjacent field.
Hot waterGround source heat pump as above.
ControlsInternal thermostat and external weather compensation thermostat.
CookingGas (bottled LPG) hob, electric oven and microwave oven.
Lighting80% (by fittings) compact flourescent, 10% LED and 10% tungsten filament (cupboards, task lighting).
AppliancesA+ rated fridge-freezer, A rated washing machine, A rated tumble dryer, A rated oven and microwave.
Renewable energy generation system1.08kWpk solar PV grid connected when built, now 3.6kW.
Strategy for minimising thermal bridgesOver-cladding of timber frame with woodfibre board.

Building construction

Storeys 2
Volume 1500
Thermal fabric area 547
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