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Built to Last – Energy Efficiency in pre-1945 Historic
Dwellings in Dublin City
Dublin City Council research project
Upper...
Project team
Consultants
• Joseph Little / Building Life Consultancy
• Fergal McGirl Architects
• Michael Hanratty / IHER ...
• Classify pre-1945 Dublin housing stock
• Assess the positive & negative energy attributes of different house types
• Exa...
Project outputs / structure
Better Building Conference 9 April 2014, Croke Park, Dublin
Whats a U-value?
Single glazed sash windows: Solid brick walls:
Modern walls:Modern double
glazing:
4.8 W/m2
K 1.1 – 2.1 W...
Climate and micro-climates in Dublin
Dublin
Colder & higher RH than Glasgow or London
Rainfall lower than Glasgow
…..but m...
Energy use in a three-storey Georgian townhouse
(Lennox St. case study house)
Finding the balance between energy
conservation and building conservation
Classifications
58 house types identified based on:
• Age
• Construction
• Size
• Architectural features
Classifications – variation in scale
7 retrofit case studies
North Great Georges St.,
Dublin 1
Albany Road,
Ranelagh (19th c.)
Griffith Ave.,
Drumcondra
Albany...
8 largely unretrofitted case studies
(dwellings in largely original condition)
Henrietta St.
Dublin 1
Ashfield Ave,
Ranela...
Technical Features –
Analysis of measured results
Analysis of measured results – BER
North Great Georges St.,
Dublin 1
(pr...
North Great Georges Street case study
(protected structure)
D2->C2
BER
1.03Heat loss area/floor area
€5300Actual heating c...
Prioritising Works
2.51Heat loss area/floor area
0.48Wall area/total heat loss area
F->D1BER improvement
50%Reduction in actual Kwh usage
Whi...
21%Increase in fuel cost!
0.29Wall area/total heat loss area
D2->C3BER improvement
9%Increase in Kwh usage!
Belton Park Vi...
Upper Leeson Street case study
Upper Leeson Street case study
Upper Leeson Street case study
(protected structure)
G->C1BER
1.89Heat loss area/floor area
67%BER - estimate energy savin...
Microgeneration?
Window upgrade
http://www.historic-scotland.gov.uk/technicalpapers
Window upgrade
Window upgrade
Secondary glazing Albert Hall, DCU
(U value of 1.89 w/m2k measured at Fitzwilliam Hotel)
Window upgrade
Slim double glazing to existing sashes
Walls - In-situ U-value measurements
1.09 1.19 1.62
Measuring absorption rates of solid walls
Measuring absorption rates of solid walls
Walls - Absorption rates
Old ≠ more absorbent
Absorption rate of Dolphin House 1960s brick
highest of all samples
X 200Pos...
Walls – insulation approaches
Calcium silicate board
Floors – insulation from underfloor voids
Roofs – the difficult areas!
• Understand the specific thermal characteristics of your house
• Be aware of the order of priority of works
• Increased t...
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Energy Efficiency in pre-1945 Historic Dwellings in Dublin City

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Built to Last – Energy Efficiency in pre-1945 Historic Dwellings in Dublin City
Dublin City Council research project presented at ULSARA's AGM, 30 April 2014 by Fergal McGirl Architect

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Energy Efficiency in pre-1945 Historic Dwellings in Dublin City

  1. 1. Built to Last – Energy Efficiency in pre-1945 Historic Dwellings in Dublin City Dublin City Council research project Upper Leeson Street Area Residents Association AGM 30 April 2014, Litton Hall Fergal McGirl – Fergal McGirl Architects
  2. 2. Project team Consultants • Joseph Little / Building Life Consultancy • Fergal McGirl Architects • Michael Hanratty / IHER Energy Services Steering Group • Dublin City Council Heritage Office/Conservation Office • Dublin City Council Architects Department • Dept. of Arts, Heritage & the Gaeltacht • Irish Georgian Society Funding • Heritage Council County Heritage Plan Grant Scheme 2013 • Department of Arts Heritage and the Gaeltacht Government Policy on Architecture Grant Scheme 2013
  3. 3. • Classify pre-1945 Dublin housing stock • Assess the positive & negative energy attributes of different house types • Examine appropriate interventions to pre-1945 Dublin dwelling • Assess the heritage impacts and technical issues of energy upgrade • Study pre-1945 construction materials Built to Last – Energy Efficiency in pre- 1945 Historic Dwellings in Dublin City Dublin City Council research project A number of firsts….
  4. 4. Project outputs / structure Better Building Conference 9 April 2014, Croke Park, Dublin
  5. 5. Whats a U-value? Single glazed sash windows: Solid brick walls: Modern walls:Modern double glazing: 4.8 W/m2 K 1.1 – 2.1 W/m2 K 1.4 W/m2 K 0.15 – 0.2 W/m2K
  6. 6. Climate and micro-climates in Dublin Dublin Colder & higher RH than Glasgow or London Rainfall lower than Glasgow …..but more exposure to SW driving rain Many Irish dwellings need heating when temperatures are higher but windspeed is stronger (shoulder seasons) Ref: Paul Overy
  7. 7. Energy use in a three-storey Georgian townhouse (Lennox St. case study house)
  8. 8. Finding the balance between energy conservation and building conservation
  9. 9. Classifications 58 house types identified based on: • Age • Construction • Size • Architectural features
  10. 10. Classifications – variation in scale
  11. 11. 7 retrofit case studies North Great Georges St., Dublin 1 Albany Road, Ranelagh (19th c.) Griffith Ave., Drumcondra Albany Road, Ranelagh (20th c.) Whitehall Road, Dublin 14 Belton Park Villas, Donnycarney Upper Leeson St., Dublin 2
  12. 12. 8 largely unretrofitted case studies (dwellings in largely original condition) Henrietta St. Dublin 1 Ashfield Ave, Ranelagh Niall St, Oxmanstown Irvine Tce, East Wall Brighton Rd, Rathgar Lennox St, Portobello Dingle Rd, Cabra Ailesbury Gardens, Merrion Gates
  13. 13. Technical Features – Analysis of measured results Analysis of measured results – BER North Great Georges St., Dublin 1 (protected structure) Albany Road, Ranelagh (19th c.) Griffith Ave., Drumcondra Albany Road, Ranelagh (20th c.) (deep retrofit) Whitehall Road, Dublin 14 Belton Park Villas, Donnycarney Upper Leeson Street (protected structure) D2 –> C2 G–> C1 E1–> C3 G –> C3 G–> A3 F–> D1 D2–> C3
  14. 14. North Great Georges Street case study (protected structure) D2->C2 BER 1.03Heat loss area/floor area €5300Actual heating costs (551 m2 house) 12%Glazing area/floor area
  15. 15. Prioritising Works
  16. 16. 2.51Heat loss area/floor area 0.48Wall area/total heat loss area F->D1BER improvement 50%Reduction in actual Kwh usage Whitehall Road case study
  17. 17. 21%Increase in fuel cost! 0.29Wall area/total heat loss area D2->C3BER improvement 9%Increase in Kwh usage! Belton Park Villas case study
  18. 18. Upper Leeson Street case study
  19. 19. Upper Leeson Street case study
  20. 20. Upper Leeson Street case study (protected structure) G->C1BER 1.89Heat loss area/floor area 67%BER - estimate energy savings 12%Glazing area/floor area
  21. 21. Microgeneration?
  22. 22. Window upgrade http://www.historic-scotland.gov.uk/technicalpapers
  23. 23. Window upgrade
  24. 24. Window upgrade Secondary glazing Albert Hall, DCU (U value of 1.89 w/m2k measured at Fitzwilliam Hotel)
  25. 25. Window upgrade Slim double glazing to existing sashes
  26. 26. Walls - In-situ U-value measurements 1.09 1.19 1.62
  27. 27. Measuring absorption rates of solid walls
  28. 28. Measuring absorption rates of solid walls
  29. 29. Walls - Absorption rates Old ≠ more absorbent Absorption rate of Dolphin House 1960s brick highest of all samples X 200Possible variation in absorption rates between brick & rendered wall X 3Absorption rates of different bricks
  30. 30. Walls – insulation approaches Calcium silicate board
  31. 31. Floors – insulation from underfloor voids
  32. 32. Roofs – the difficult areas!
  33. 33. • Understand the specific thermal characteristics of your house • Be aware of the order of priority of works • Increased thermal comfort is possible • Don’t expect a significant payback on investment (after attic insulation & heating system upgrade) • Consult with local authority conservation officer Built to Last – Energy Efficiency in pre-1945 Historic Dwellings in Dublin City Dublin City Council research project Approaching an energy retrofit of a traditional house – Some thoughts 30 April 2014, Litton HallUpper Leeson Street Area Residents Association AGM

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