@buildtomade: Can spray foam REALLY lift concrete? I put it to the test in my lab. After drilling holes in a sunken slab leading up to my mom’s home, I tested a few approaches from jigs to jack up concrete to testing anchors. But there’s one method that worked the best to raise an inch, despite getting a little messy.   Would you try this for a small job? I used 2 cans for less than $15 + a few materials/tools I had on hand.  Hope you found this helpful. Talk soon!