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Why Are These Foundations Crumbling?

Ask This Old House mason Mark McCullough investigates a strange issue happening to foundations in the Northeast

Resources:

Mark discovered that thousands of homes built between 1980-2017 in Western Massachusetts and Northern Connecticut have concrete foundations with pyrrhotite in the aggregate. These foundations will, after a period of 20 years or so, begin to crumble until they are no longer structurally sound.

For more information, check the Connecticut Coalition Against Crumbling Basements.

Additional assistance with this segment was provided by Michelle Loglisci, Russ Dupere, and Mark Violette.