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Featured Article

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.

Search Construct Ireland

Official magazine of EascaEasca
EnerPHit E-mail
Wednesday, 01 February 2012

The survey revealed significant cold spots at skirting level
The survey revealed significant cold spots at skirting level

Selected project details

Client: Brian Meaney & Karen Daly
Architect: OLS Architects
Main contractor: Creedon Construction
Heating & ventilation: Heat Doc
Window supplier: Munster Joinery
Airtightness testing & thermal imaging: Greenbuild
Specialist external insulation system: Smart Facades

Project overview:

Building type
: 150 square metre detached two-storey existing house, constructed in 2003

Existing construction:
traditional partially filled cavity wall blockwork construction, which was filled with bead insulation by the owners in 2005. Traditional pitched cut roof with slate finish.

: Castlebridge, Co Wexford    

Completion date
: November 2011

EnerPHit certification
: pre-submission

Space heating demand (PHPP)
: 25 kWh/ m2/yr

Heat load (PHPP)
: 10 W/m2

: target of one air change per hour at 50 pascals pressure. An airtightness test was carried out on the existing house with a result of 4.59 air changes per hour at 50 pascals pressure

: pending

Ground floor
: existing 150mm concrete floor slab, with 55mm expanded polystyrene insulation, on radon barrier, on sand blinding, on compacted hardcore.
U-value: 0.62 W/m2K

Block walls
: 10mm Parex Lanko render to 200mm EPS Aerobord external insulation, to existing rendered blockwork fully filled insulated cavity wall.
U-value: 0.11 W/m2K

Brick walls
: 10mm Parex render to 200mm EPS Aerobord external insulation, to parge coat, to existing brick outer face of fully filled insulated cavity wall.
U-value: 0.11 W/m2K

: Existing slated traditional cut roof, insulated at ceiling level, with foil backed plasterboard to ceiling. New Intello airtight breather membrane applied to existing ceilings, with new 12.5mm Gypsum plasterboard ceiling with skim finish. 200mm additional mineral wool insulation added to existing ceiling insulation.
U-value: 0.09 W/m2K

: new Munster Joinery triple-glazed PassiV Future Proof certified windows, argon filling, with an overall U-value of 0.78 W/m2K

Heating system
: Danfoss DHP-AQ 6.2kw air to water with a COP of 4,0 (according to EN14511 – including circulation pumps) & Maxi unit 180L TWS technology hot water cylinder providing faster, hotter water.
The heat pump operates on a floating condensing control and will be coupled to the existing radiator system. Heating system by Heat Doc Ltd

: Zehnder Comfoair CA350B heat recovery ventilation system — Passive House Institute certified ventilation system by Heat Doc Ltd


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