Describe how to carry out checks and record installation of works for quality, standards and compliance with the retrofit design, and manufacturers' instructions, for the following: alterations to the structure loadings fixings corners, junctions and edges of building elements interfaces between the building fabric, services and the occupants windows and doors including reveals, sills and soffits thermal bypass thermal bridges air tightness vapour barriers moisture movement moisture ingress condensation and interstitial condensation risks rainwater goods mechanical, electrical and plumbing (MEP)