upgrade PROJECT OVERVIEW: Building type: 367 sq m renovation and extension to a 1960s detached house Location: Donnybrook, Dublin 4 Completion date: September 2013 Budget: not disclosed Enerphit certification: certified Space heating demand (PHPP): 21 kWh/m2/yr Heat load (PHPP): 12 W/m2 Primary energy demand (PHPP): 109 kWh/m2/yr Energy costs Before: heating and hot water bills had been €4-5,000 per annum – and the building wasn’t able to maintain 18C during the heating season. After: an estimated total for heating/hot water of circa 8800/2700 kWh, totalling circa €850 per annum. Airtightness (at 50 Pascals): 0.63 air changes per hour Original walls: a combination of uninsulated cavity wall and single leaf nine inch hollow block walls. Upgraded/extension walls: Acrylic render finish on 200mm White EPS 90 insulation fixed to existing structure or to 215mm new blockwork walls. Hard plaster scratch coat to internal face of walls, 38mm battened service void with 12.5mm skimmed plasterboard finish. U-value: 0.17 Original ground floors: suspended timber floors, uninsulated. Upgraded & extension ground floor: timber floor on 75mm screed with underfloor heating on 160mm PIR insulation on 200mm reinforced concrete slab on continuous radon barrier / DPM lapped and sealed on sand blinding on hardcore. U-value: 0.131 Original roof: cut timber roof with circa 100mm fibre glass insulation on attic floor. New roof: Roadstone mini-slate concrete roof tiles fixed to treated battens, on a Pro clima Solitex Plus waterproof membrane over counter battens, on 60mm Xtratherm XT sarking board on timber joists [11%] on 225mm Metac glass fibre insulation. Continuous Intello airtight membrane taped and sealed with Pro Clima Tescon tape to underside of joists, with 60mm service void filled with Metac between battens. U-value: 0.115 Flanking roofs: as above on slope except with 175mm rafter, no plasterboard and no service cavity. Flat of flanking roofs includes Paralon roofing felt and 120mm of Paratorch insulation; 225 cellulose and Intello airtightness membrane. Slopes of flanking roofs include 80mm Xtratherm sarking board, and 175mm pumped Warmcel celluloseinsulation, and Intello airtight membrane. Original windows & doors: double-glazed PVC windows, glazed hardwood front door and doubleglazed hardwood windows and doors to rear utility. New triple-glazed windows: HolzPlus timber aluclad frames with IV 78 windows and doors, class four for airtightness. Glass U-value of 0.6. Frame U-value for fixed unit: 1.0 Frame U-value for opening unit: 1.1 Roof windows: two bespoke triple-glazed Ruhm Flushlight roof windows. Centre pane U-value: 0.8. Two Fakro U6 roof windows with Thermo flashing system. Overall U-value: 0.81 Heating system Before: standard efficiency gas boiler and radiator system. After: 30kW 93% efficient Worcester Bosch Greenstar modulating condensing gas boiler with Heatmiser PRT-TS / PRT-NTS controls & radiators. Two 6.97 kW 81% efficient Gazco Studio 2 balanced flue – room sealed – gas fires. Domestic hot water: 5 sq m Kingspan HP400 solar panels & 200L storage cylinder Ventilation Before: some wall vents. After: Passive House Institute certified Dantherm HCH5 heat recovery units, with summer bypass, 77% efficiency (including air duct losses) Lighting: predominantly LEDs and fluorescent lamps, including dimmable LED wall lights. Water: Kingspan Water ENV100 Envireau Gravity System with 3000L storage capacity for flushing toilets and irrigating gardens Green materials: cellulose insulation, GGBS (from top down) The original house; which ended up having to be virtually demolished; EPS was used to externally insulate the walls; the ductwork for the MVHR system inside the airtight layer; a thermal imaging test at 5C external temperature
just three days. “It was all well planned,” he says, “there were no major problems, no major hiccups.” SELECTED PROJECT DETAILS Client: private Architect: Bright Design Architects M & E engineer: Ramsay Cox & Associates Civil / structural engineer: Barrett Mahony Consulting Engineers Energy consultant: Integrated Energy Main contractor: Passive House Builders Client's representative: McCarthy & Associates Quantity surveyors: Duffy Gaffney Partnership Landscape gardening: Doylescapes Mechanical contractor: Noel Geraghty Heating & Plumbing Electrical contractor: CTS Electrical Airtightness tester/consultant: 2eva.ie External insulation system: Sto Below DPC wall insulation: Kingspan Aerobord Sarking board & floor insulation: Xtratherm Glass fibre insulation: Isover Flat roof felt & insulation: Moy Materials Cellulose insulation: Warmcel Cellulose insulation installer: Ecowise Thermal blocks: Quinn Lite
Airtightness products: Ecological Building Systems/Alfa Windows & doors: True Windows Roof lights: Ruhm GGBS: Ecocem Condensing boiler: Worcester Bosch Solar array: Kingspan Renewables Room sealed gas fires: Heating distributors Underfloor heating & solar subcontractor: Base Engineering Underfloor heating system: Hevac MVHR & central vacuum syustem: Beam Central Systems Lighting design: Wink Lighting Rainwater harvesting: Kingspan Environmental
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