Pyrrhotite and crumbling foundations
Manchester sits at the western edge of the region affected by concrete aggregate containing pyrrhotite, an iron sulphide mineral that expands as it reacts with water and oxygen, cracking and deteriorating foundation walls typically one to three decades after the pour. Foundations poured roughly between the early 1980s and 2016 warrant a deliberate assessment. The state created the Connecticut Foundation Solutions Indemnity Company to help fund repairs, and sellers must disclose what they know.

