Connecticut's Department of Consumer Protection has received complaints from 220 homeowners about crumbling concrete foundations, and construction experts estimate that thousands of homes across the state might be affected. Two companies at the center of the investigation have signed an agreement with the state to stop selling materials or products for residential foundations containing aggregate from a Willington, Conn., quarry until 2017.

The two companies, J.J. Mottes Company, in Stafford Springs, and Becker Construction, in Willington, have acknowledged for the first time that, pyrrhotite, an iron sulfide mineral, may be a contributing factor to the crumbling foundation problem in Hartford, Tolland and Windham counties, reports Green Building Advisor's Scott Gibson.

Construction experts say there is no fix for the foundation problem and that all the concrete must be replaced, at a cost of $150,000 or higher for each home.

In a written statement, Connecticut Attorney General George Jepsen said, "Although that investigation will continue into the fall, we believe there is now sufficient evidence to conclude that significant levels of the mineral pyrrhotite in stone aggregate used in the production of concrete is a substantial contributing factor to the crumbling foundations experienced by some homeowners in eastern Connecticut... Further efforts are necessary to understand the full range of contributing factors and the manner that all factors interact to produce concrete deterioration."

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