Issue 12, Vol 5 Out Now
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Featured Article
| EnerPHit |
While the principles of low energy building apply equally for new build and upgrades, the reality is that htting passive levels becomes much trickier when retrofitting. The Passive House Institute have taken this on board and created a retrofit standard that is ambitious but achievable.
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Official magazine of Easca  |
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Rise of the passive house |
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Wednesday, 01 February 2012 |
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Page 20 of 20
Selected project details
Architect: OA Studios
Build system supplier: Advanced Timbercraft
Civil / structural engineer: Fahy & Fitzpatrick Engineers
Main contractor: Halton Construction
Airtightness & insulation products: Ecological Building Systems
Airtightness tester: Greenbuild
Windows and doors: Internorm
Heating system supplier: Pure Renewable Energy
Energy consultant: Passivate
Lighting: Light4Living
Heating & lighting controls: IDAS Ltd
Rainwater harvesting: Watersource
Roof lights: Tradecraft Building Products
Electrical contractor: JR Healy Electrical
Project overview:
Building type: 256 square metre single-storey bungalow styled
dwelling to the front south elevation with pitched A-roof. Two-storey
contemporary styled dwelling to the rear north elevation with Alkor flat
roof sections.
Location: Mount Merrion, Co Dublin
Completion date: November 2011
Passive house certification: pre-submission
Space heating demand (PHPP): 11 kWh/m2/year
Heat load (PHPP): 7 W/m2
Airtightness: 0.53 air changes per hour at 50 Pa
BER: pending
Ground floor: 500mm high Supergrund ‘F’ external wall profile
(ringbeam). Internal retaining walls formed with Q7 Quinnlite insulated
blocks. Floor build-up is 100mm concrete slab with reinforcing mesh, on
400mm EPS100 insulation, on 50mm stone blinding (3-8mm stone), on
monarflex Radon DPM barrier c/w sump and vent pipes by Neoflex, on 250mm
well compacted hardcore (18-35mm hardcore).
U-value: 0.075 W/m2K
Walls: 80mm Gutex Thermowall external insulation with Stucco
render, 241mm lightweight I-beam Advanced Timbercraft timber frame
structure with Daemstatt cellulose insulation, 18mm OSB sheeting, pro
clima DA Membrane forming airtightness layer taped and sealed with pro
clima airtightness tapes glues and accessories, 89mm service cavity with
hemp insulation and 12.5mm Gypsum plasterboard.
U-value: 0.093 W/m2K
Pitched roofs: re-used existing tiles on 50x25mm soft wood
treated timber battens at 250c/c, on counter battens, on Solitex
breathable high performance felt, on 70mm foilbacked PUR insulation,
fixed to 175x44mm rafters at 400c/c with cellulose insulation between
pumped to 55kg/m3, on Intello membrane, on 89mm service void with hemp
insulation between, on 12.5mm Gypsum plasterboard.
U-value: 0.122 W/m2K
Flat Roofs: standing seam Alkor membrane, on 18mm WBP plywood, on
firring pieces all to achieve 1:80 fall to gutter valley, on battens,
on Solitex high performance breathable membrane, on 70mm foil backed PUR
insulation, on 175x44mm rafters at 400c/c with cellulose insulation
between pumped to 30kg/m3 between rafters, on Intello airtight membrane,
on 50mm battens to form service void with hemp insulation between, on
12.5mm Gypsum plasterboard.
U-value of 0.128 W/m2K
Windows: Passive House Institute certified Internorm
triple-glazed alu-clad windows with a thermally broken painted spruce
timber frame. Argon-filled cavities with low emissivity glass.
Overall U-value: 0.71 W/m2K
Rooflights: 7 triple-glazed Fakro FTT U6 Thermo rooflights with class 4 airtightness level, warm TGI spacers, Krypton-filled cavities.
Overall U-value: 0.81 W/m2K
Heating system: Daikin Altherma 11Kw split system – a high
temperature air to water heat pump with 50L system buffer and a COP of
3.08 at 7C in to produce hot water at 55C, two Daikin flat panel solar
collectors 2.6 m2 each with 300L hot water storage tank and 3Kw back-up
immersion element. Heat distribution is by four 1kW towel radiators in
the bathroom and en-suites plus one radiator at north end of the
building on each floor. All integrated and programmable through KNX
energy management system.
Ventilation: Paul Novus 300 Passive House Institute certified
heat recovery ventilation system of minimum 90% efficiency, interfaced
through KNX control LCD panels.
Green materials: woodfibre, cellulose and hemp insulation
Other green credentials: 4,800L Carat rainwater harvesting tank
with multiple filter packages allowing rainwater to be used throughout
the house including drinking and showers. KNX intelligent building home
automation and energy management system. Guaranteed energy savings of
60% throughout the home with light, ventilation, shading and heating.
Low voltage LED lights to be used throughout house with dimmer control
and motion sensors integrated into the KNX control / interface
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Jeff Colley |
| About the author: |
| Jeff
Colley has been the editor of Construct Ireland, Ireland's pioneering
sustainable building magazine, since 2003.
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