upgrade PROJECT OVERVIEW: Building type: 400 square metre two-storey detached house from 1926. Enerphit refurbishment with single-storey side and rear extension Location: Rathgar, Dublin Completion date: July 2015 Enerphit certification: pending BER Before: D1 (251 kWh/m2/yr) After: A2 BER (43.05 kWh/m2/yr) Space heating demand (PHPP): 22 kWh/m2/yr Heat load (PHPP): 13 W/m2 Primary energy demand (PHPP): 78 kWh/m2/yr Airtightness (at 50 Pascals): 0.99 ACH Walls Before: 215mm solid brick walls with no insulation. U-value: 3 W/m2K After: 200mm silver aged KORE EPS insulation and acrylic render finish externally, 215mm brickwork, 50mm uninsulated service cavity inside. U-value: 0.15 W/m2K Extension walls: 200mm silver aged KORE EPS insulation and acrylic render finish externally, 215mm block wall, 50mm uninsulated service cavity. Two courses of Quinn Lite blocks at floor to wall junction. U-value: 0.15 W/m2K Extension boundary wall (adjacent to neighbouring house): 215mm block on flat internally followed outside by 80mm Xtratherm insulation, 20mm ventilated void, and then 100mm block externally. Quinn Lite blocks at top of boundary wall to eliminate thermal bridges. U-value: 0.22 W/m2K Roof Before: Roof slates to sloped areas and torch on felt to flat roof areas externally. No Insulation. After: (sloped ceiling areas): Blue Bangor slates externally, on counterbattens, on pro clima Solitex breathable membrane with 220mm Metac between rafters, on Siga Majpell airtight membrane stapled to underside of rafters, counterbattens to create a 500 service cavity inside insulated with Metac. U-value: 0.15 W/m2K After (flat ceiling areas): Blue Bangor slates on counterbattens, on pro clima Solitex breathable membrane with 400mm Isover Metac above the ceiling joists and 200mm between. Siga Majpell airtight membrane stapled to underside of rafters, counterbattened to create a 25mm uninsulated service cavity. U-value: 0.08 W/m2K Existing ground floor: Uninsulated suspended timber floor Upgraded ground floor and extension floor: Poured concrete onto existing concrete subfloor (brought level with extension floor), 150mm Xtratherm PIR insulation above. Underfloor heating pipes in concrete screed, polished concrete floor finish. U-value: 0.13 W/m2K Windows & doors Before: single-glazed, timber windows and doors. Overall approximate U-value: 3.50 W/m2K New triple-glazed windows: Rationel Aura Plus triple-glazed aluclad windows and doors with argon fill and warm-edge spacers: Overall U-value of 0.93 W/m2K Sliding doors & curtain walling: Carey Glass 52mm triple-glazing with A-rated warm edged spacer bars. Ug value: 0.7 W/m2K. Reynaers frames for sliding door & curtain walling with respective Uf values of 2.6 & 2.3 W/m2K. Overall U-values for sliding doors & curtain walling respectively of 1.1 & 0.90 W/m2K. Roof windows: 9 x Fakro FTT U6 thermally broken triple-glazed roof windows with thermally broken timber frames. Overall U-value: 0.80 W/m2K Pet door: highly insulated & airtight Petwalk automated door, with frame and door insulated with rigid polyurethane. U-value: 0.5 W/m2K Heating Before: 20 year old oil boiler & radiators throughout entire building After: Remeha modulating condensing gas boiler, 40 Kingspan solar tubes, underfloor heating to ground floor, and six fan coil units providing cooling to upper floors supplied by a Panasonic heating & refrigeration air source heat pump. Polytherm underfloor heating system with Heat Miser controls. Heat Miser control system regulates underfloor heating system downstairs and towel rail circuit upstairs, with a thermostat in every room, while also controlling the hot water. Also controllable via a touchscreen interface in the plant room. Ventilation Before: no ventilation system. Reliant on infiltration, chimney and opening of windows for air changes. After: 2 x ZehnderComfoAir 550 MVHR units — Passive House Institute certified to have heat recovery rate of 84%
SELECTED PROJECT DETAILS Architect (planning drawings & project supervision): Mola Architecture Architect (working drawings & passive house details): Natalie Walsh Contractor: Pat Doran Construction M&E engineer: Ethos Engineering Structural engineer: Garland Consultancy Passive house consultants: Integrated Energy, Target Zero Passive house certification: Mead Consulting BER: Rate My Home Quantity surveyor (client): KMCS Quantity surveyor (contractor): RTC Surveying Electrical contractor: Jones Engineering Group Plumbing: Prospect Plumbing & Heating Underfloor heating contractor: Base Engineering Underfloor heating system: Polytherm MVHR: Flynn Heat Recovery Air-to-air heat pump: Panasonic Fan coil units: Tech Refrigeration Solar thermal: Alternative Energy Ireland Airtightness testing: Greenbuild EPS insulation: Airpacks External render: Neotherm
External insulation contractor: Enda Linnane Construction Mineral wool insulation: Isover Airtightness products: Siga Breather membranes: Ecological Building Systems Floor insulation: Xtratherm Thermal breaks: Partel Low thermal conductivity blocks: Quinnlite Roof insulation & airtightness contractor:Baker & Co Windows & doors: Rationel Curtain walling: Lakeside Windows Roof windows: Tradecraft Pet door: Petwalk Polished concrete floor: Renobuild Roofing: Christy McMahon Carpentry
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