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.mediafire.com/file/6emcjulr359wm9v/pdf-99619-42738.pdf/file
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.