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The following are publications developed under Task 37:

General Publications

Advances in Housing Retrofit
Processes, Concepts and Technologies
October 2011 - PDF 8.96MB - Posted: 10/4/2011
Editor: Sebastian Herkel and Florian Kagerer
With 60 documented retrofitted buildings, task 37 shows the different strategies and technologies available for advanced housing renovation in twelve participating countries. Detailed analysis shows that the step to Net Zero Energy Buildings (NZEB) is coming more to reality.
This source book deals with processes, concepts, economy and technologies which are all relevant to achieve the approach of a significant reduction of the energy demand in combination with an efficient energy supply from renewable sources. This book represents an impressive source of information from collaborative work of more than 30 experts from 12 countries.

The book gives a comprehensive insight in advances achieved within Task 37. It addresses professionals in the building sector as well as the scientific community. The book includes thematic chapters of Processes and design methodology, Building envelope, Ventilation, Energy supply systems, Solar Thermal in Renovation, Design Solutions and Performances of demonstration buildings.
Advances in Housing Retrofit
From Demonstration Projects to Volume Markets
Market Development for Advanced Housing Renovation
April 2010 - PDF 5.35MB - Posted: 10/20/2010
By: Are Rødsjø, Edward Prendergast, Erwin Mlecnik, Trond Haavik, Paul Parker
How do we get from demonstration projects to a volume market for very low energy demand in advanced housing renovation? The contributors to this report have been working with this issue for many years. Some worked in both IEA SHC Task 28 Sustainable Housing (2000-2005) and in SHC Task 37 Advanced Housing Renovation with Solar and Conservation. This work resulted in the handbook Business Opportunities in Sustainable Housing (from Task 28) and in this booklet. Building stock analyses from Task 37 show that many countries have a huge theoretical potential for reducing the energy consumed in the existing building stock. The question is: How do we speed up
the transition from demonstration projects to volume market? This report looks both at a traditional market development perspective and interventions by public actors. By doing this, the report aims to provide a better understanding of what drives advanced housing renovation, and provides a reference document designed to inform and recommend directions for policy makers and central decision makers.
From Demonstration Projects to Volume Markets
Advanced Housing Renovation with Solar and Conservation
Task 37 Flyer
May 2007 - PDF 0.45MB - Posted: 6/28/2007
By: Robert Hastings and Daniela Enz
Task 37 is a research and demonstration project of the International Energy Agency, Solar Heating & Cooling Programme (IEA SHC). Duration: 2006 - 2009
Advanced Housing Renovation with Solar and Conservation
Housing Renovations Film Clips - Posted: 1/20/2009
A set of film-clips about housing renovations have been developed with special funding from Norway. These films are available from www.lavenergiboliger.tv/filmengelsk.html .

The following are available in English and German language:

Why low energy? (4 minutes)
Low-rise flats, Nuremberg (17 minutes)
Housing cooperatives for passive housing, Sweden (16 minutes)
Municipal assistance, Norway (12 minutes)
Advanced and Sustainable Housing Rennovation Handbook
A guide for Designers and Planners
PDF 15.2MB - Posted: 7/2/2010
By: Sophie Trachte
This handbook is produced from material developed in the course of IEA SHC Task 37 Advanced Housing Renovation by Solar and Conservation. Operating agent was Fritjof Salvesen from Norway. This venture brought together some 50 experts from 12 countries. The objective of this task was to develop a solid knowledge base how to renovate housing to a very high energy standard while providing superior comfort and sustainability and to develop strategies which support market penetration of such renovations explicitly directed towards market segments with high renovation and multipliable potentials.
Advanced and Sustainable Housing Rennovation Handbook

Renovation Examples

1Lessons from Exemplary Housing Renovations
Task 37 Advanced Housing Renovation with Solar and Conservation / Subtask B
May 2010 - PDF 6.18MB - Posted: 5/21/2010
By: Robert Hastings
Editor: Editor of the Brochures: Robert Hastings
60 exemplary housing renovations achieving dramatic energy savings have been documented in brochures as part of a project of the International Energy Agency*. This summary presents lessons learned from a collective look at these brochures from ten countries:
AT, BE, CA, CH, DE, DK, I, NL, NO and SE.
1Lessons from Exemplary Housing Renovations
Belgium - Rowhouse Henz-Noirfalise
PDF 0.81MB - Posted: 1/18/2008
This 150 year old house needed a thorough renovation. The exterior was insulated with cellulose, new triple glazing was installed, the building is heated with solar collectors and pellets stove. 95% energy reduction.
Belgium - Rowhouse Henz-Noirfalise
Germany - Apartment Building Blaue Heimat
PDF 0.17MB - Posted: 1/18/2008
Building under historical preservation protection, substantial renovation with redesign of floor plans. Heating supply by CHP combined with peak load boilers and water storage. 84% energy reduction.
Germany - Apartment Building Blaue Heimat
Austria - Apartment Building in Kierling
PDF 0.94MB - Posted: 1/29/2008
Building from the 1970’s with massive un-insulated walls, passive house standard insulation, new 90 m2 DHW solar heating, annual energy demand 68 kWh/m2
Austria - Apartment Building in Kierling
Switzerland - Apartment Building in Ostermundigen
PDF 0.46MB - Posted: 1/29/2008
60% heating energy reduction of 1960's building, new apt. layouts, new sunspaces and penthouses, innovate heat recovery system.
Switzerland - Apartment Building in Ostermundigen
Switzerland - Apartment Building in Staufen
PDF 0.45MB - Posted: 1/29/2008
65% reduction of primary energy, two stage renovation: envelope then tech. systems, 110 m2 roof-integrated PV, new deeper thermal-bridge-free balconies.
Switzerland - Apartment Building in Staufen
Switzerland - One-Family House in Walenstadt
PDF 0.6MB - Posted: 1/29/2008
80% reduction in heating energy, solar drain-back combi dhw-heating system, new architecture.
Switzerland - One-Family House in Walenstadt
Switzerland - Apartment Building with Shops in Zurich
PDF 0.66MB - Posted: 1/29/2008
75% energy reduction in urban apt. building with historic protected façade, prefab new roof modules for new attic penthouse.
Switzerland - Apartment Building with Shops in Zurich
Sweden - Apartment Building in Alingsas
PDF 0.37MB - Posted: 3/31/2008
The Brogarden housing estate with 300 apartments built in 1970. Better insulation, heat exchanger and solar heating system bring the annual heat demand down to 55 kWh/m2.
Sweden - Apartment Building in Alingsas
Austria - Apartmenthouse in Linz
PDF 0.52MB - Posted: 4/15/2008
Renovation to passive house standards, 91% space heating reduction. Special cellulose comb arranged behind a facade of glass panels.
Austria - Apartmenthouse in Linz
Austria - Housing in Purkersdorft
PDF 0.98MB - Posted: 4/15/2008
Renovation of a 19th century villa with four flats and constructed of 10 passive-house units. The 60 m2 solar system covers 28% of the DHW and space heating.
Austria - Housing in Purkersdorft
Austria – Single-family House in Mautern
PDF 7.27MB - Posted: 5/19/2010
Renovation of a single-family house from the 1950s. Components of a Passive House, central mechanic ventilation system with heat recovery, air/air heat pump.
Austria – Single-family House in Mautern
Austria – 19th Century Villa in Purkersdorf
PDF 0.49MB - Posted: 5/19/2010
Renovation of a 19th century villa with four flats, including ventilation system with heat recovery, solar panels and insulation of walls. After the renovation, the building is close to complying with Passive House standards.
Austria – 19th Century Villa in Purkersdorf
Austria – Apartment Building in Kierling
PDF 2.15MB - Posted: 5/19/2010
Renovation of a 1970s apartment building, including central ventilation system with heat recovery, new insulation and windows, plus solar panels. Complies with Passive house standards, annual space heat demand is now 13 kWh/m².
Austria – Apartment Building in Kierling
Austria - Single-family House in St.Valentin
PDF 0.39MB - Posted: 5/19/2010
Renovation of single-family house built in 1982 with vertical enhancement for a second housing unit. Special feature: A centralized ventilation system with heat recovery (efficiency 90%) combined with an air/air heat pump.
Austria - Single-family House in St.Valentin
Austria – Apartment Building in Linz
PDF 2.57MB - Posted: 5/19/2010
Renovation of an apartment building built in 1958: New façade with solar insulation system, ventilation system with heat recovery and air heating. After renovation the building complies with Passive House Standard, annual space heat demand is 11 kWh/m².
Austria – Apartment Building in Linz
Austria – Summer Residence in Pettenbach
PDF 6.8MB - Posted: 5/19/2010
Renovation of a summer residence built in 1962. New features include: ventilation system with heat recovery and air heating, vacuum insulation panels and photovoltaic panels. Complies with Passive House requirements; 98% reduction of primary energy demand.
Austria – Summer Residence in Pettenbach
Austria – historic building in Irdning
PDF 6.43MB - Posted: 5/19/2010
Renovation of a historic building built in 1567, with four flats and two shops. Improved insulation, ventilation system with heat recovery and solar energy contributed to the 93 % reduction of energy demand.
Austria – historic building in Irdning
Austria – Single-family House in St.Martin
PDF 3MB - Posted: 5/19/2010
Renovation of a single-family house built in 1973 with an added storey for a second housing unit. A geothermal heat pump was installed and the building is ventilated by a mechanical system with 90% heat recovery and an earth to air heat exchanger preheats intake fresh air.
Austria – Single-family House in St.Martin
Austria – Detached House in Kufstein
PDF 5.3MB - Posted: 5/19/2010
Renovation of a detached house built in 1981 with a new facade and an enlargement of the living space. Important energy saving features are high insulation, triple thermopane glazed windows and an energy optimized modern shell. Solar collectors were installed for domestic water heating.
Austria – Detached House in Kufstein
Austria - Attic Conversion in Innsbruck
PDF 2.44MB - Posted: 5/19/2010
Conversion of the attic of a 19th century building; two new levels are built of connected wooden boxes. Special features are solar collectors and laminated wooden roof construction. Complies with Austrian low energy requirements.
Austria - Attic Conversion in Innsbruck
Austria - Home for Elderly in Landeck
PDF 2.21MB - Posted: 5/19/2010
After renovating this home for the elderly, built in 1976, comfort was greatly improved. The wooden construction’s high insulation value and frameless glazing of the west façade minimize energy losses. The building complies with Austrian low energy requirements.
Austria - Home for Elderly in Landeck
Austria – Apartment Buildings in Dornbirn
PDF 4.27MB - Posted: 5/19/2010
Renovation of five apartment buildings built in 1980. Central ventilation system with heat
Recovery and 5x30 m² solar collectors contributed to 59 % reduction of primary energy demand.
Austria – Apartment Buildings in Dornbirn
Belgium – Row Houses in Eupen
PDF 3.42MB - Posted: 5/19/2010
Transforming a 19th century row house into a Passive House led to 96 % energy demand reduction. Features include Ventilation with heat recovery, a ground-air heat exchanger, solar collectors, wood pellet stove and improved insulation.
Belgium – Row Houses in Eupen
Belgium - Semi-detached House in DePinte
PDF 2.41MB - Posted: 5/19/2010
Retrofit of a semi-detached house from the 50’s approaching Passive House Standard. The design focusedon sufficient insulation and airtight construction. Since the party wall faces south, windows were designed to make the best of available passive solar gains.
Belgium - Semi-detached House in DePinte
Belgium – Old Country House in Hershelt
PDF 2.98MB - Posted: 5/19/2010
Retrofit of a century old country house into a low energy house. The rural location of the project resulted in a very strict interpretation of the urban planning legislation. Energy reduction after retrofit: 88,5 %.
Belgium – Old Country House in Hershelt
Belgium – Apartment Block in Wesenbeeck
PDF 2.22MB - Posted: 5/19/2010
Thorough renovation of an apartment block from 1959: Energy loss minimized trough insulation, heat recovery and thermal bridge alleviation. Solar collectors and pv panels installed.
Belgium – Apartment Block in Wesenbeeck
Belgium – 19th Century Building in Brussels
PDF 2.4MB - Posted: 5/19/2010
The existing roof structure was worn out and a new roof mandatory. The roof was removed and new apartments built in a light wooden frame construction on top of the building. Geothermal heat pump and solar collectors provide heat.
Belgium – 19th Century Building in Brussels
Belgium – Conversion of Old Laundry in Brussels
PDF 0.83MB - Posted: 5/19/2010
Conversion and renovation of an old laundry into residential and office space. Insulation, solar collectors and PV installation contributed to the 70 % reduction of primary energy demand.
Belgium – Conversion of Old Laundry in Brussels
Canada – Single Detached House in Toronto
PDF 1.12MB - Posted: 5/19/2010
Retrofit project for an existing 1 1/2 storey house from 1946. The renovation, including among other features external foam insulation and solar energy applications, met the Net Zero Energy Healthy House (NZEHH) standards set out in a Canadian home design competition.
Canada – Single Detached House in Toronto
Canada - Single Family House in Ontario
PDF 1.59MB - Posted: 5/19/2010
Retrofit of single family house included upgraded insulation (by use of polyurethane spray foam and also an insulated concrete form system), and adapting front porch and new extension roof for solar installations. Primary energy reduction: 81 %.
Canada - Single Family House in Ontario
Switzerland – Historically Protected Senior Residence in Bern
PDF 3.57MB - Posted: 5/19/2010
Renovation of a historically protected senior residence built in 1872 with an extension to the rear of the west wing, new floor plan layout and energy saving measures, including new insulation and mechanical ventilation with heat recovery.
Switzerland – Historically Protected Senior Residence in Bern
Switzerland – Single Family House in Lanterswil
PDF 2.13MB - Posted: 5/19/2010
Modernization of a single family house. One of the heat loss reduction measures is a passive solar façade that absorbs and stores solar energy to create a warm buffer between the house and the ambient. Additionally, PV panels (4,9 kWp) were added.
Switzerland – Single Family House in Lanterswil
Switzerland –Two-Family House in Stansstad
PDF 11.69MB - Posted: 5/19/2010
Comprehensive renovation of building built in 1962. Work included elimination of thermal breaks, new central ventilation system with heat recovery, central wood pellet stove (8 kW), solar collectors. Complies with the Swiss Minergie-P Standard.
Switzerland –Two-Family House in Stansstad
Switzerland – Single Family House in Ostermundigen
PDF 1.14MB - Posted: 5/19/2010
Improved insulation, structures for utilization of passive solar energy, a PV system (6.6 kWp), solar thermal collectors and a geothermal heat pump result in net energy production (10 kWh/m²a).
Switzerland – Single Family House in Ostermundigen
Switzerland – Apartment Building Volketswil
PDF 1.04MB - Posted: 5/19/2010
Renovation of an apartment building in a suburb of Zürich. The goal of higher energy efficiency was achieved by adding insulation to the façades, solar collectors on the roof, plus a new ventilation system.
Switzerland – Apartment Building Volketswil
Switzerland – Apartment Building in Zürich
PDF 3.69MB - Posted: 5/19/2010
The renovation included new façade to the street, new ground floor architecture, roof-integrated PV panels and solar thermal collectors. Primary energy demand was reduced by 89 %.
Switzerland – Apartment Building in Zürich
Switzerland – Apartment Towers in Geneve
PDF 1.89MB - Posted: 5/19/2010
Renovation of three small apartment towers built in 1954. Due to historic preservation, two buildings were renovated with external insulation of the walls, and one with internal insulation.
Switzerland – Apartment Towers in Geneve
Germany - Building Ensemble in Freiburg
PDF 3.14MB - Posted: 5/19/2010
Due to historical preservation protection, only attic and façade were set with new insulation. Use of combined heat and power technology, based on biomass (rape seed methyl ester). Calculated reduction of primary energy demand: 95%.
Germany - Building Ensemble in Freiburg
Germany – Row House in Mannheim
PDF 2.08MB - Posted: 5/19/2010
Renovation of apartments built in the 1930s and 1950s. Heat for the 12 flats is generated by a gas-fired condensing boiler and a combined heat + power Stirling engine. Each flat is provided with a separate high-efficiency ventilation unit placed on the attic floor.
Germany – Row House in Mannheim
Germany – Apartment Building in Frankfurt am Main
PDF 5.21MB - Posted: 5/19/2010
The renovation of two postwar period apartment buildings, lead to a 94 % reduction of annual heat energy demand, almost meeting the Passive House Standard (energy balance computed using the Passive House Planning Package (PHPP)).
Germany – Apartment Building in Frankfurt am Main
Germany – Apartment Building in Ludwigshafen
PDF 3.56MB - Posted: 5/19/2010
Renovation of a 1960 apartment building resulted in a 94 % reduction of annual heat energy demand. New features include extensive insulation, decentral ventilation system and PV roof (12.8 kWp).
Germany – Apartment Building in Ludwigshafen
Germany – Apartment Building in Ludwigshafen
PDF 3.59MB - Posted: 5/19/2010
Renovation of a 1960 apartment building resulted in a 94 % reduction of annual heat energy demand. The building complies with Passive House Standard; annual heat energy demand is 14 kWh/(m²a).
Germany – Apartment Building in Ludwigshafen
Germany – an 1892 Apartment Building in Ludwigshafen
PDF 4.73MB - Posted: 5/19/2010
Renovation of an apartment building built in 1892. To preserve the character of the exposed brickwork, 80 mm of interior insulation was used. The building was monitored for 1 1/2 years to study the interior insulation.
Germany – an 1892 Apartment Building in Ludwigshafen
Germany – Apartment Building in Nürnberg
PDF 1.97MB - Posted: 5/19/2010
Renovation of an apartment building built in 1930 resulted in 87 % reduction of annual heat energy demand. In cooperation with the Passive House Institute (PHI) a concept for an external airtight layer was developed.
Germany – Apartment Building in Nürnberg
Germany – Nursing Home in Stuttgart
PDF 2.12MB - Posted: 5/19/2010
Overall renovation of building envelope and technical services. The main heat supply is a thermal power station (100 kW with 50 kWelec). Two gas burners (310 kW) provide back-up. Result: 65% reduction of primary energy.
Germany – Nursing Home in Stuttgart
Germany – Rectory in Ulm
PDF 3.11MB - Posted: 5/19/2010
Retrofitting of the building envelope and the building technical equipment. New features include solar collectors, improved insulation, single room heating control and exhaust and supply HVAC with heat recovery.
Germany – Rectory in Ulm
Germany – Apartments and Nursery in Ulm
PDF 2.61MB - Posted: 5/19/2010
Renovation of apartment with kindergarten included new windows, floor insulation, single room heating control and exhaust and supply HVAC with heat recovery.
Germany – Apartments and Nursery in Ulm
Germany – Historical Building in Bavaria
PDF 4.44MB - Posted: 5/19/2010
Conversion of former military area built in 1888 into residential lofts and a medical center. Interior facades and roofs were insulated, Passive House Components were used, thermal bridges minimized. Energy is now supplied from biomass and solar power.
Germany – Historical Building in Bavaria
Denmark – Apartment Houses in Engelsby
PDF 1.28MB - Posted: 5/19/2010
Renovation included added insulation of facade/roof, new heating system and new water installations. Other features: Solar panels for domestic hot water, demand controlled moisture regulated ventilation and glazed balconies.
Denmark – Apartment Houses in Engelsby
Denmark – Row houses in Albertslund
PDF 0.65MB - Posted: 5/19/2010
Aim of renovation: Compliance with the Danish standards for low energy class 2. Measures: Insulation, new windows, solar collectors and mechanical ventilation with heat recovery.
Denmark – Row houses in Albertslund
Denmark – Apartment Houses in Albertslund
PDF 2.19MB - Posted: 5/19/2010
14 apartment houses, in total 631 flats, were renovated in the period from 2007-2009. The renovation of the facade respects the original architecture and uses environmentally benign materials.
Denmark – Apartment Houses in Albertslund
Italy – Historical Building in Modena
PDF 1.59MB - Posted: 5/19/2010
Renovation of historical building damaged by moisture. Renovation included insulation of the building envelope, improved frames and removal of the superfetation (extension of building that deface the construction) to improve thermal radiation.
Italy – Historical Building in Modena
The Netherlands – Single Family House in Sint Pancras
PDF 2.36MB - Posted: 5/19/2010
Renovation of single family house dating from 1939. Aims: reducing fossil energy demand by a factor 7 and later even become net energy positive due to utilization of solar energy (PV and collectors).
The Netherlands – Single Family House in Sint Pancras
The Netherlands – Row Houses in Roosendaal
PDF 3.73MB - Posted: 5/19/2010
Planned renovation of row houses built in 1965 to Passive House Standard. New features include new timber frame facades and roofs, innovative heating and solar collectors.
The Netherlands – Row Houses in Roosendaal
The Netherlands – Row Houses Kroeven in Roosendaal
PDF 1.08MB - Posted: 5/19/2010
First large-scale Passive House renovation project in Holland, the subject is a social housing project built in 1967. Innovative building technology and process have been applied. A 90 % primary energy reduction was achieved.
The Netherlands – Row Houses Kroeven in Roosendaal
Norway – Terraced Apartments in Stjørdal
PDF 0.89MB - Posted: 5/20/2010
The renovation of the terraced apartments from 1970 was first large low-energy housing renovation project in Norway. It included, among other measures, improved insulation, reduction of thermal bridges and a balanced ventilation system.
Norway – Terraced Apartments in Stjørdal
Norway – Single Family House in Orkanger
PDF 0.76MB - Posted: 5/20/2010
Renovation of a 1982 single family house including new roofing, balanced ventilation system with highly efficient heat recovery, better windows and insulation, highly efficient wood stove and heat pump.
Norway – Single Family House in Orkanger
Norway – Apartment Buildings Myhrerenga
PDF 1.66MB - Posted: 5/20/2010
The apartment buildings erected in 1967-1968 were in need of major renovation. The renovation included, among others, blown in insulation in the roof construction, extra insulation in external walls and balanced ventilation system with high efficiency heat recovery.
Norway – Apartment Buildings Myhrerenga
Norway – Log House in Kongsberg
PDF 1.68MB - Posted: 5/20/2010
Built as a holiday cottage in 1942 using 6” logs, and converted into a permanent residence in 1997. The renovation was made in several stages and comprised the building envelope and a new ventilation system.
Norway – Log House in Kongsberg
Norway – Row House in Oslo
PDF 1.33MB - Posted: 5/20/2010
Typical row house in the end of a three unit row, built in 1962, with poor insulation and thermal bridges. Renovation included internal vacuum insulation and installation of an integrated ground to water heat pump.
Norway – Row House in Oslo
Sweden – Apartment Building in Alingsås
PDF 3.32MB - Posted: 5/20/2010
300 apartments constructed in 1970 to be renovated to passive house standard. Measures include added insulation (ground floor, exterior walls and roof), new facade material and new windows.
Sweden – Apartment Building in Alingsås
Sweden – Apartment Building in Backa
PDF 2.63MB - Posted: 5/20/2010
In Backa outside Göteborg, the public housing company Poseidon has been renovating their apartments, built in the 70s. The renovation process continues, with focus on energy, first in a demonstration project.
Sweden – Apartment Building in Backa
Switzerland – Apartment Building in Zurich
PDF 0.78MB - Posted: 5/20/2010
Renovation of an 1898 apartment building in poor condition. A 75 % reduction of primary energy demand was attained.
Switzerland – Apartment Building in Zurich
Switzerland – Single Family House in Walenstadt
PDF 0.75MB - Posted: 5/20/2010
Renovation of a single family home led to an 80 % reduction of primary energy demand. New features included insulation of building envelope and new windows. Pellets stove and solar collectors were installed.
Switzerland – Single Family House in Walenstadt
Germany – Apartment Building in Heidelberg
PDF 0.21MB - Posted: 5/20/2010
Building under historical preservation protection going through substantial renovation with redesign of floor plans, insulation of the building envelope, central heating system based on combined heat and power (CHP).
Germany – Apartment Building in Heidelberg
Germany – Apartment Building in Freiburg
PDF 0.24MB - Posted: 5/20/2010
Two similar apartment buildings from 1961 with different ventilation systems; mechanical ventilation with heat recovery (60 kWh/m²a heat demand), and exhaust air ventilation (65 kWh/m²a heat demand).
Germany – Apartment Building in Freiburg

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