I am building a new home in Sigar Land TX, near Houston. The foundation was poured on 7/8/00 and in about 3-4 days the slab has a crack running from one side of the slab to the other. This crack is about 1/2 mm thick and is visible to the naked eye. It is visible on the 2 sides as far as I could dig the dirt about 1 feet deep and probably it goes even deeper. It is also visible on the surface of the slab. After about 10 days the post tension cables were pulled to tension and the cracks appear to have closed a little bit, but still visible. Is this crack normal in post tension foundations in this area and will I have any problem with this crack in the future. The builder says that this is normal and not to worry about it. But from the appearance of the crack I think that the slab has cracked in 2 and that this is a serious problem.
Any comments are appreciated.
Thanks in advance.