Okay! The concrete trade poured 2 1/2 - 3 inches but should have been 4 inches internal house. It’s a prolific pour so the outside structure is sound but there is cracking and the engineer says 2 options pour 3 inches of concrete over existing floor but we have framed, plumbed and completed most of electrical we just so happened upon this error based on an electrical error the other option is use gutters to protect from moisture to prevent heaving later but I thought maybe earthen floors could be a better option for the flooring we use on top of the slab... hope this helps... Thanks