I'm having engineered wood floors put in my condo. The unit is ground floor, so it's slab on grade/below grade (the front of the building is below grade, the back isn't). I've torn out all the carpets already.
The closet, which is in the front part of the unit, has always been a bit damp. When I pulled the carpet I found the tack strip was obviously moisture damaged. Not totally rotten, but discolored. Not shocking if it's been a little damp for 20+ years, I guess.
A test square of plastic on the other side of the unit showed no moisture. I haven't done a similar test in the closet yet.
The floor guy is doing a floating install. He had intended to go without a moisture barrier, but when I voiced concerns he suggested a pad with a built-in moisture barrier. Is this valid or should I insist on the 6-mil poly sheeting? Is there anything else I should do to protect myself? I'm worried about the closet.