new build PROJECT OVERVIEW: Building type: 219 square metre detached timber frame dwelling Location: Boyle, Co Roscommon Completion date: March, 2015 (excluding site-works & landscaping) Final cost: €215,000 approximately (excluding site-works & landscaping) Passive house certification: pre-submission Space heating demand (PHPP): 12 kWh/m2/yr (based on preliminary airtightness results) Heat load (PHPP): 7 W/m2 (based on preliminary airtightness results) Primary energy demand (PHPP): 83 kWh/m2/yr Airtightness: 0.23 ACH at 50 Pa Energy performance coefficient (EPC): 0.313 Carbon performance coefficient (CPC): 0.346 BER: A2 (49.52 kWh/m2/yr) Thermal bridging: Raft foundation with first three course of Quinn Lite aerated concrete blocks, timber frame / Larsen truss walls and roof structure, timber / aluclad windows located in accordance with PH recommended window details, insulated reveals and cills. Y-value (based on ACDs and numerical simulations): 0.08 W/mK Ground floor: 75mm screed on 260mm EPS100, on Monarflex RMB350 radon membrane, on 150mm reinforced concrete raft to engineer's specification. U-Value: 0.13W/m2K First floor (inside the thermal envelope): Laminate floor on soundproofing layer, on two layers of 12mm plywood, on 405mm top hung Easi-Joists, (filled with 405mm Dämmstatt cellulose insulation), on pro clima WA membrane, on 35/48mm counter batten, on 12.5mm gypsum board. U-Value: 0.093 W/m2K Walls: 20mm Nap plaster finish, on 100mm blockwork rain screen, on 50mm ventilated cavity, on pro clima Solitex Fronta Humida wall membrane, on 125 x 25mm untreated diagonal racking, on timber frame / larsen truss wall constructed with untreated 89 x 38mm outer non-loadbearing stud, with untreated 139 x 38mm internal loadbearing stud both at 600 Crs, with 12mm 300 x 375mm gusset plates at 1200mm Crs (filled with 330mm Dämmstatt cellulose insulation), on untreated 125 x 25mm untreated diagonal racking, on pro clima Intello Plus airtightness membrane, on untreated 50 x 50mm battens at 400 Crs forming service cavity with 50mm Thermafleece sheep wool batts, on 12.5mm Gypsum plasterboard. U-value: 0.10 W/m2K. Roof: Natural slate on 44 x 38mm slating batten, on 44 x 38mm ventilation battens (running same direction as the rafter on top of the rafter), on pro clima Solitex Plus breathable membrane with pro clima Naidec nail sealing tape, on 22mm natural timber sheeting, on a Larsen truss roof / rafter system made up of 125 x 44mm rafters on 50mm EPS rigid insulation, on 225 x 44mm rafters with 12mm 300 x 375mm gusset plates at 1200mm Crs. (filled with 400mm Dämmstatt cellulose), on pro clima Intello Plus airtightness membrane, on untreated 50 x 50mm battens at 400 Crs forming service cavity with 50mm Thermafleece sheepwool batts, on 12.5mm Gypsum plasterboard. U-value: 0.093 W/m2K. Ceiling / roof (to cold attic): 530mm Dämmstatt cellulose, on 150 mm collar ties, on pro clima Intello Plus airtightness membrane, on 48/48mm counter batten, on 12.5mm gypsum board. U-value: 0.075W/mK Windows: Munster Joinery passive house certified EcoClad timber-aluclad triple-glazed windows with argon filling and a U-value of 0.7 W/m2K for the glazing, and overall U-values of between 0.99 W/m²K and 0.79 W/m2K installed (including frames). Roof windows: Roto Designo roof windows with R8 BlueTec Plus glazing 9P (compliant with passive house) with prefitted insulation collar against heat loss, and vapour barrier for optimal airtightness. Overall U-value: 0.84 W/m2K Heating system: 92% efficient Grant Vortex condensing oil boiler supplying three radiators and 300 litre two-coil Joule stainless steel cylinder, plus 40-tube Joule Acapella solar thermal array. Ventilation: Zehnder ComfoAir 550 MVHR system, Passive House Institute certified to have heat recovery rate of 84%, EN 308 certified efficiency of 92.7%. Green materials: cellulose insulation, sheep wool insulation, untreated timbers.
(from top right) The roof begins to take shape; Thermafleece insulation used at window reveals; shown here is the 100mm blockwork, a 50mm ventilated cavity, and a Pro Clima Solitex Fronta Humida wall membrane; (below) the house is rendered externally with a Nap plaster finish
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