A large number of properties that had the insulation installed by successive UK government-backed schemes were installed incorrectly or were unsuitable for the property. Incorrectly installed cavity wall insulation (CWI) causes water to seep into a property's walls, causing structural problems and damp patches that may also manifest into mould.
Many properties with insulation work done through various UK government-backed programs had installations that were either incorrect or not suitable for their structures. Improperly installed cavity wall insulation (CWI) allows water to enter the walls of buildings, causing structural problems and dampness that could lead to mold growth.