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

https://www.scribd.com/document/1037191333/Foundation-Repairs-Near-Me-3-Key-Things-to-Know-Before-You-Make-the-Call-207481

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.