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

https://andresbieg222.image-perth.org/top-3-things-to-know-before-calling-a-foundation-repair-company-for-basement-waterproofing-1

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.