I inspected a home yesterday. Foundation was slab. Some of the concrete was what I would call spalling. It was delaminating from itself in about 1"-thick pieces. At one corner it was still in place, but I could see that about a 4 foot piece of it was loose (again about a one to one and a half inch thick piece.)
What causes this and how much of a problem is it?
Thanks in advance for any help.