Sub-floor Systems for concrete and slab on grade floors will help to keep moisture out of your finished basement. The water resistant poly membrane is installed with its dimples down to create an air space above the slab. It can be covered with laminate floor systems, or with a plywood sub-floor - topped off with carpet or vinyl flooring. Sub-floor systems provide a dryer, warmer, more comfortable floor for your finished basement.
Spycor recommends using a dimpled polyethylene underlayment when refinishing a basement or slab on grade construction.