Passive House Retrofit in Monkstown, Co. Dublin
Project Overview
This case study showcases a remarkable transformation of a 1960s semi-detached house in Monkstown, Co. Dublin. The homeowners, driven by a desire for improved comfort and energy efficiency, embarked on an ambitious passive house retrofit project.
PHAI Member: Passivhaus by Peter Legge Architects in Co. Meath
PHAI Consultant: Archie O’Donnell, Passivhaus Consultant
Key Challenges
Upgrading a 60-year-old building to meet stringent passive house standards
Addressing thermal bridging issues in the existing structure
Implementing effective airtightness measures
Integrating modern systems while preserving the home's character
Retrofit Measures
Insulation and Airtightness
External walls: 200mm mineral wool insulation added
Attic: 400mm mineral wool insulation installed
Floor: 150mm PIR insulation incorporated
Windows: Triple-glazed units with insulated frames fitted
Airtightness: Achieved an impressive 0.93 air changes per hour at 50 Pascals
Heating and Ventilation
Air source heat pump installed for space heating and hot water
Mechanical ventilation with heat recovery (MVHR) system implemented
Renewable Energy
3kW solar PV array installed on the roof
Results and Benefits
Energy consumption reduced by over 90%
Annual heating costs dropped from €2,500 to just €250
Comfortable indoor temperature maintained year-round
Improved indoor air quality
BER rating upgraded from G to A2
Homeowner Satisfaction
The owners reported significant improvements in comfort levels and a drastic reduction in energy bills. They particularly noted the consistent temperatures throughout the house and the absence of drafts.
Lessons Learned
Careful planning and attention to detail are crucial for successful passive house retrofits
Addressing thermal bridging in existing structures requires innovative solutions
Homeowner engagement throughout the process ensures satisfaction with the end result
This project demonstrates that achieving passive house standards in older homes is not only possible but can result in substantial improvements in comfort, energy efficiency, and overall living quality.