I am adding a 24x28 ft 2-story addition to my house. The footings have rebar and are about 20"-24" thick, but the contractor did not use any wire mesh reinforcement in the 4"-thick slab.
Now, three months later as they are getting ready to put in the carpet, I noticed there is a 1/16" wide crack that spans almost the entire length of the slab. The contractor says it's a shrinkage crack and not to worry about it, but I'm concerned anyway.
I live in North Alabama and the soil is largely clay. Is it normal for a slab to crack that quickly and how likely am I to have problems since no wire mesh was used?
Thanks for any help!