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

https://telegra.ph/Residential-Foundation-Repairs-3-Questions-to-Ask-Before-You-Call-05-04

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.