Abstract
Energy retrofit of historic buildings often represents a challenge for owners and practitioners. They feel that they lack knowledge and do not have access to suitable solutions. Where to start – the envelope or the heating system? Which material to use? Are all equally suitable or am I restricted in my Strickbau with solid timber walls? Is there an alternative to replacing the windows? How much saving can I reach?
The growth of awareness and interest in sustainability has led to an increase in the number of solutions available for the improvement of historic buildings' energy performance. National and international research and innovation projects, such as FP projects 3encult, EFFESUS and ReBuild, P-Renewal in Belgium, Spara och Bevara in Sweden, etc., have developed solutions and guidelines, but the information is usually available in single reports, publications, and data sheets.
Dissemination of this information, and examples of successful implementation, is inadequate for all stakeholders. This is especially important if conservation authorities are involved, whose task it is to keep buildings which have been there for hundreds of years fit for upcoming generations and not just thirty years. Therefore, evidence for long term performance and technical compatibility is crucial. Evidence in terms of practical implementation and documented tests would improve practitioners' trust on these solutions and encourage the adoption by owners in the building renovation.