new build PROJECT OVERVIEW: Building type: 189 sq m detached two-storey timber frame house Location: Old Downs Rd, Kilpedder, Co Wicklow Completion date: June 2012 Budget: Contract sum €390,000 Passive house certification: Not submitted for certification as airtightness test results didnʼt achieve the required level. The figures in the following sections are from our as-built PHPP using the airtightness test results achieved Space heating demand (PHPP): 14 kWh/m2/yr Heat load (PHPP): 12 W/m2 Airtightness: 1.45 ACH at 50 Pa BER (indicative rating): A3 (59 kWh/m2/yr). The client is considering the installation of solar PV panels which would affect the result Thermal bridging: all elements of the envelope were insulated externally to minimise thermal bridging, as described in the following sections Ground floor: 100mm polished concrete on 200mm concrete raft on 250mm Kingspan Styrozone H350R insulation, wrapped up outer face of raft at edges. U-value 0.112 W/m2K Walls: factory-built timber frame with 80mm wood fibre insulation board externally finished with Knauf acyrlic render, over 220 x 60 cellulose-filled timber studwork, followed internally with 18mm OSB taped & sealed with Vario MultiTape SL, 50mm service cavity insulated with Thermafleece sheep’s wool insulation, and 13mm. Fermacell board on 11mm OSB. U-value: 0.122 W/m2K Roof: Protec glass fibre waterproofing layer on 240mm Kingspan TR27 insulation on vapour control layer on 18mm OSB deck, ex 38 x 38 tilting fillets, 220 x 60 timber joists, followed underneath by Gerband SD2 Control airtightness membrane & Isocell Airstop tapes, 50 mm service cavity and 12.5mm plasterboard ceiling. U-value: 0.097 W/m2K Windows: Nestle Climate Window HA triple-glazed aluminium-clad timber windows with argon filling. Overall U-value: 0.74 W/m2K Heating system: 60 Kingspan Thermomax solar vacuum tubes and Olsberg Tolima Aqua Compact 10kW room-sealed wood-burning stove with back-boiler (70% of stoveʼs heat output goes to hot water) supplying underfloor heating and 500 litre combi tank Ventilation: Paul Focus 200 heat recovery ventilation system, Passive House Institute certified to have heat recovery rate of 91% Lighting: a mix of low energy lighting including CFLs, LEDs & IRCs with dimmers
(above) The double-height main living space around which the whole house revolves (opposite) large windows and roof lights allow plenty of sunlight into the house, while also providing views of the garden and sky FSC certified European Oak was used for all joinery and timber flooring; (p51) this timber frame house is a compact and simple design which made it easier and more cost-effective to aim for the passive house standard
SELECTED PROJECT DETAILS Clients: Simon Kennedy, Jenny Howe Architects: Fitzpatrick & Mays Architects Mechanical contractor: Heat Doc Ltd Airtightness tests: GreenBuild Indicative BER: 2eva.ie Cellulose insulation & airtight tapes in roof: Isocell Floor insulation: Kingspan Insulation Airtightness tapes in walls: Isover Airtightness membrane: Gerband Sheep’s wool insulation: Ecological Building Systems Plaster board: Fermacell Organic paints: Auro Windows, doors & rooflight: Jens Kuechenmeister
Green materials: Fermacell dry lining board; cellulose, sheep’s wool and wood fibre insulation; Auro organic paint. FSC certified European Oak used for all joinery and timber flooring, finished in Osmo Polyx white oil Landscaping: all boundaries planted with native hedging species of hawthorn, hazel and holly. Green manure crop of two seeds of clover mixed with an ornamental crop of wildflower seeds sewn to improve disturbed soil following building works. Edible landscaping includes planting of apple trees, plum tree, pear tree, blueberry bushes and a walnut tree
External render: Knauf Heat recovery ventilation: Pure Renewable Energy Solar thermal array: Kingspan Renewables Rainwater harvesting: Molloy Precast Wastewater disposal:Biorock system supplied by TEC Electrics: Lawlor Electrical Lighting design: Wink Lighting Joinery: Oikos Furniture Ltd Kitchen: Rhatigan & Hick Tiling: Gerard Benson Painting: Kelly and Thompson Stone paving: Banagher Stone Polished concrete floors: Concrete Concepts Landscape design: Howbert & Mays
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