The bad thing about any foundation repair is that the top concrete is going to crack with any movement.

Then, he shaves the foam down flat after it completely dries.

you could get about 16 feet out of each can of foam.

Fix cracks in the cement driveways and sidewalks

This is a wonderful method of fixing cracks, I will be trying it soon.

Fix cracks in concrete with landscaping foam

Caulk cracks in your cement driveway or sidewalk