OK all you builders and handymen/women..... I have a house with seriously dried out foundations, no doubt due to our recent and lengthy dry spell. It didn't really concern me, until recently I've noticed that there is now a widening gap in between an area at the bottom of the concrete slab (of the garage) and the earth. Over time, the grass area appears to have sunk, along with some pavers abutting the brick wall of the garage, hence the gap. I can see the bottom of the slab and it does concern me Would I be best simply filling it up with some quickset cement or is there a more ominous problem here?