I have a simiiar problem with a garage floor that I believe was poured well after the home was built. The house itself is on pilings, but the garage is a slab that's pretty much poured right on the ground. It's been there at least 20 years, and to my surprise has not fallen victim to the frost heaves that we get in this area (anchorage, AK). But it is starting to slope a little toward one corner. Is there any way to correct or slow/halt the progression of this problem, or is it just a matter of time until I have to rebuild the garage?