It is a requirement of Part C of the Building Regulations that buildings, and people who use these buildings, are adequately protected from harmful effects of moisture.
The Ministry of Housing, Communities and Local Government commissioned PRP to carry out this research study. There were two key aspects to the project:
to verify the robustness of the guidance presented in Approved Document C for new buildings in the light of changes to Part L and to identify gaps in the current guidance
to develop a set of relevant guidance for situations where insulation is retrofitted to existing buildings