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

https://andersonzpqe314.novacrestiq.com/posts/foundation-repair-and-basement-waterproofing-3-must-know-items-before-calling-2

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.