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

https://felixurbd613.rivetgarden.com/posts/residential-foundation-repair-3-things-to-know-before-calling-a-foundation-repair-company-near-me-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.