The 3 things I learned when I had my foundation repaired that shocked me: clay heave can lift slabs, not just sink them

https://blogfreely.net/morvetgbfq/h1-b-3-things-to-know-before-you-encapsulate-crawlspace-and-schedule-17y3

The 3 things I learned when I had my foundation repaired that shocked me: clay heave can lift slabs, not just sink them, and root moisture removal can trigger upward movement.