My house is on a slab that has a pronounced dip in the back part of the house. None of the doors (bedroom and bathroom) line up correctly and close and one of the walls is not attached to the floor anymore. There are no cracks in the foundation itself. Has anyone had this sort of thing before and if so, what is it you did to remedy it? I am just getting to this part of the fixing up, and am sort of lost as to who to contact for this work.