https://stream.echo6.co/videos/watch/1469443b-9adb-4b0b-b0d6-ea29097e3107 Ask This Old House mason Mark McCullough investigates a strange issue happening to foundations in the Northeast SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse 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 (http://www.ccacb.org/). Additional assistance with this segment was provided by Michelle Loglisci, Russ Dupere, and Mark Violette. About Ask This Old House TV: Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook. Follow This Old House and Ask This Old House: Facebook: http://bit.ly/ThisOldHouseFB Twitter: http://bit.ly/ThisOldHouseTwitter http://bit.ly/AskTOHTwitter Pinterest: http://bit.ly/ThisOldHousePinterest Instagram: http://bit.ly/ThisOldHouseIG http://bit.ly/AskTOHIG Tumblr: http://bit.ly/ThisOldHouseTumblr For more on This Old House and Ask This Old House, visit us at: http://bit.ly/ThisOldHouseWebsite Why Are These Concrete Foundations Crumbling? | Ask This Old House https://www.youtube.com/user/thisoldhouse/ Sun, 17 May 2026 05:37:40 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/1469443b-9adb-4b0b-b0d6-ea29097e3107 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.