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“A house built to the department’s Part L spec would have cost €310,000, whereas built to the passive house standard, this house came in at €290,000.”

PROJECT OVERVIEW: Building type: 250 square metre detached dormer masonry built house Location: Ballymore Eustace, Co. Kildare Completion date: April, 2015 Budget: €290,000 Passive house certification: not certified Space heating demand (PHPP): 18 kWh/m2/yr Heat load (PHPP): 10 W/m2 Primary energy demand (PHPP): 75 kWh/m2/yr Airtightness: 0.61 ACH at 50 Pa Energy performance coefficient (EPC): 0.334 Carbon performance coefficient (CPC): 0.355 BER: A2 (47.27 kWh/m2/yr)

(below) The front facade of the house incorporates a fairly traditional design, though the rear (p59) is more contemporary in appearance; (above) Reynaer’s aluminium bi-fold doors, triple-glazed with argon filling and an overall U-value of 1.0 W/m2K; (p61, top to bottom) the house features a Viking House passive slab insulated foundation system; metal web joists create smooth and neat runs for services; thermal bridge free sills from Passive Sills with windows installed proud of blockwork; airtightness detailing with Siga tapes and membranes around the Velux roof window; the Zehnder Comfoair 350 MVHR system; the block-built house was insulated externally with Kore EPS

Thermal bridging: Viking Passive Slab L-shaped profile connecting 300mm EPS beneath the floor with 250mm EPS on the walls externally, windows fitted externally to the face of block and sitting on EPS Passive sills, 90mm window frames wrapped in EPS, 180mm Metac at wall plate connecting 250mm EPS on walls to 320mm Metac between rafters. Y-value based on PHPP defaults. Ground floor: Viking House passive slab insulated foundation with 300mm EPS. U-value: 0.9 W/m2K Walls: Acrylic render externally on 250mm Kore External EPS insulation, on 215mm block on the flat, on sand & cement render internally with skim coat finish. U-value: 0.12 W/m2K Sloped ceiling: Quinn roof tiles externally on 50x35 battens/counter battens, followed underneath by Pro Clima Solitex breathable roofing underlay, 320mm rafters fully filled with Isover Metac mineral wool, Siga Majpell airtightness membrane stapled to underside of rafters internally, 50mm service cavity insulated with Metac, 12.5mm plasterboard ceiling. U-value: 0.11 W/m2K Flat Ceiling: Quinn Rooftiles externally on 50x35 battens/counter battens, followed underneath by Solitex breathable roofing underlay, 400mm fibreglass above the ceiling joists, 200mm fibreglass between the joists, Siga Majpell airtight membrane stapled to underside of joists internally, uninsulated 25mm service cavity, 12.5mm plasterboard ceiling. U-value: 0.08 W/m2K Windows: Munster Joinery Passiv uPVC Passive House Institute Certified triple-glazed windows, with argon filling and an overall U-value of 0.85 W/m2K. Reynaer’s Aluminium bi-fold door, triple-glazed with argon filling and an overall U-value of 1.0 W/m2K. Roof window: Velux MK06 triple-glazed roof window. U-value: 1.0 Wm2K Heating system: 92% efficient Grant Vortex condensing oil boiler supplying seven radiators and 850 litre Viessmann buffer tank, plus 120 Joule Acapella solar vacuum tubes supplying separate buffer tank Ventilation: Zehnder Comfoair 350 heat recovery ventilation system — Passive House Institute certified to have heat recovery rate of 84%

Profile for Passive House Plus (Sustainable Building)

Passive house plus issue 11 (UK edition)  

Passive house plus issue 11 (UK edition)