Since 2012, a quality control system is in operation in Belgium to provide confidence in the quality of the works of cavity wall insulation in existing cavity walls. The system is managed by a quality control and certification organisation which is responsible for the assessment and approval of products and systems, the training of installers, and the conformity checks on building sites. When the works are in line with the quality control framework, the installer may provide a declaration of conformity to the client, which the client can use to receive subsidies or as an input for an energy performance certificate.
This field study was performed to analyse the relationship between the information provided by the installers in the declaration of conformity, the results of the conformity checks performed by the certification organization, and the effective cavity wall performance on site. The study is based on the field investigation of 26 detached and semi-detached houses, with retrofit cavity wall insulation installed in 2012 or 2013 under the quality control system. The analysis of the field study is focusing on both the compliance of input data and the quality of the works.