new build PROJECT OVERVIEW: Building type: Detached home with total floor area of 151 square metres Location: Steel Farm, Whitfield, Northumberland Completion date: February 2013 Budget: £275,000 Passive house certification: Certified Space heating demand (PHPP): 14 kWh/m2/yr Heat load (PHPP): 10 W/m2 Primary energy demand (PHPP): 74 kWh/m2/yr Airtightness (at 50 Pascals): 0.32 ACH or 0.35 m3/m2/hr Energy performance certificate (EPC): B 91 Measured energy consumption: The house consumed six 47kg LPG cylinders in one calendar year after occupation. Approximate total. energy usage: 1861.2 kWh/yr. Consumption for spacing heating, DHW and some (but not all) cooking: 12.33 kWh/m2/yr
LPG per year. The average internal temperature during the summer did not exceed 25C and the peak daily temperature was less than 25C for 95% of the year. When the peak external temperature reached 35C, the peak internal temperature was some 6C cooler (29C.) In February of 2015, Steel Farm became a certified passive house. Trevor says: "The construction of our new home has been a real adventure; challenging at times but, all in all, well worth the wait. Both Mark and Joe have met and exceeded our expectations. I don't think that we could have been in safer hands." But the final word comes from Judith Gospel: “In our old accommodation, a winter or two ago, 2011 I think, we measured the temperature of the fridge and the living room. At one point it was warmer in the fridge! More than the savings in the energy bills and the reduced environmental impact, we are enjoying the comfort of our new home." Download over £30,000 of technical papers for free by visiting: www.leap4it.co.uk/building-performance.html
SELECTED PROJECT DETAILS Clients: Trevor & Judith Gospel Architect: LEAP (Lovingly Engineered Architectural Process) Contractor: JD Joinery & Building Services M&E Engineer: Alan Clarke Mechanical contractor: Oakes Energy Servies Airtightness tester: Apex Air Windows & doors, airtightness products, MVHR & low water fittings: Green Building Store Wall & floor insulation: Knauf Cellulose insulation: Warmcel Wall ties: Ancon Blockwork: Topblock Condensing gas boiler (converted to LPG): Broag Solar thermal: Viridian Solar Electrical contractor: KM Electrical Services
Thermal bridging: Achieves a 90% reduction in thermal bridging as compared to the Accredited Construction Details and an 80% reduction compared to EST Enhanced Construction Details. Ground floor: Strip foundation with 300mm closed cell Knauf Polyfoam Floorboard ECO XPS insulation (Standard).U-value: 0.11 Walls: Local sandstone externally, followed inside by 300mm cavity insulated with Knauf DriTherm Cavity Slab 32 Ultimate mineral wool insulation, 150mm blockwork, 18mm plaster. U-value: 0.10 Roof: Slate externally, followed underneath by trussed rafters insulated with 500mm Warmcel, 18mm OSB (taped joints), 25mm service void, 12mm plasterboard. U-value: 0.08 Windows: Triple-glazed Green Building Store Ecopassiv windows, (Ug=0.7, g-value 0.5), insulated timber frame, Uw: 0.76 Heating system: Remeha gas condensing boiler converted to LPG. Heat distributed to radiators. Solar thermal panels and solar thermal store (250 litres with 100mm insulation).
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Ventilation: Paul Novus MVHR. Passive House Institute certified to have heat recovery rate of 93%, and a specific fan power of 0.33 W/m3. Green materials: Stone from local quarry, all timber and timber products PEFC and FSC.
(bottom left) door undercuts provide air transfer provision and help improve ventilation; (bottom right) pipework for the Paul heat recovery ventilation system; (p47) (top left) airtightness detailing around the windows; (top right) plaster detailing for airtightness around electrics; (bottom left) low conductivity TeploTie basalt wall ties cut out thermal bridging; (bottom right) plywood boxes around the windows minimise thermal bridging