Selection of internal thermal insulation for existing solid masonry walls in the UK: the specifiers’ perspective

This research provides a unique insight into how specifiers make decisions and the knowledge they use when specifying internal wall insulation for solid masonry walls. In the UK there are around 8.5 million buildings with solid masonry walls that require thermal upgrades to meet climate change targets. The literature indicates that the specification of internal wall insulation is a complex task, requiring specific knowledge to undertake it competently. To date there has been no research that has investigated how such decisions are made. Three focus groups (n15) and a questionnaire survey (n408) captured the views of professionals working in small design practices in England. Thematic analysis found no consistent pattern of behaviour and inconsistent knowledge of guidance documents. Specifiers claimed to be sufficiently knowledgeable to specify although, the findings suggested otherwise. Implications for practice are profound, raising practical questions relating to specialization and the competences required to specify internal wall insulation.