Adhesives and Moisture

[CC Solutions]

Here's why I say that:
Years ago we had more asbestos in flooring materials, and our adhesives were much more forgiving. Under-slab vapor retarders were not as common and concrete moisture was seldom an issue. If there was a vapor retarder installed, it was probably 6 mil poly, and those poly retarders degrade over time. There was also a time when sand blotter layers were the norm, and we now know that blotter layer is a great conduit for water movement under the slab.

I have been finding the majority of slabs I test that are over 10 years old have very high moisture levels.