Asked on Oct 13, 2011
My 12 x 14 ft concrete patio is sinking in the middle towards the house.
It has sunk about 2 inches in the last 6 to 9 months; the slab is about 18 inches to 2 feet above the surrounding ground. The house is 43 years old, so I find it hard to believe that is just now getting around to settling. We've had a huge problem with chipmunks. I know they've tunneled underneath the patio as we seen their holes. Can we just level out the surface or do we need to inject concrete to raise the slab back to level? What's the likelihood that it will crack down the middle? I don't know how much rebar was used in construction. Any thoughts?