Thanks to all (VAD, RDK, Focht3 and ashjun) for the input. There has been no heave in the slab, only minor cracking previously mentioned. Since the area has received 10" rain in May alone (definitely not normal for this locale), the idea of the clay being saturated make sense. We parted...
Two year old home basement slab (in Georgia clay) has several cracks, in different areas of the slab, with moisture showing 6" either side of cracks. French drain at base of foundation w/water piped to buried catch-basins located on downhill side of house. All downspouts are piped into...