Plywood Floor Over Concrete. I have a living room floor comprised of 26 floor joists on 12 center topped with a 34 tongue and groove plywood screwed down every 6 inches and sub floor liquid nails. Place a 6-mil polyethylene vapor retarder directly over the concrete.
Cover the whole side of the plywood with a layer of adhesive making it about 18-inch thick. For the second story a foamed type of lightweight concrete is being used over plywood for sound absorption between floors. Place the first layer with edges parallel to the longest starting wall.
Installation over concrete with a calcium carbide reading of greater than 25 percent.
A particleboard subfloor is not recommended for a concrete finished floor. I have a living room floor comprised of 26 floor joists on 12 center topped with a 34 tongue and groove plywood screwed down every 6 inches and sub floor liquid nails. Once youve installed a vapor retarder install your subfloor. Duraamens Param 5500 goes on thin in a 38 to 12 thick application.
