We live in NE Florida where the water table is 3 feet below the surface. My house was built in 1974 and is on a monolithic slab. Recently while redoing the dining room, we laid 6 mil poly over the carpet to protect it and then covered that with 3/4 plywood to erect scaffolding. After the project was completed we noticed the carpet was damp under the poly. It had been down about a month. So it looks as if moisture is wicking up through the slab.
Is there a product to seal the floor? I know of Dryloc but wasn't sure if it would be the best for under all types of floors. We plan on wood, tile and carpet. I only want to do this once so I'll pay for the best!