Two fundamental concepts permeate this writing: 1) the floor is part of a building envelope, but 2) also is in itself a system comprising many elements. For a floor to function successfully, specifiers, builders, owners, and finish/flooring installers each must understand the factors for floor performance, especially moisture. In the past few years since the first edition, we have witnessed significantly increased dialogue between general contractors, construction managers, concrete contractors, flooring installers, and design professionals. The industry has introduced new and improved products including flooring adhesives, vapor retarders, and moisture suppression coatings. New moisture test instruments are on the market due to the widespread adoption of relative humidity testing. The industry has essentially eliminated the use of a blotter/cushion layer above vapor retarders in new slabs-on-grade construction, resulting in fewer chronic problems. However, moisture problems persist due to schedule demands, limited awareness of moisture issues, and sensitivity of some finishes and flooring systems.

For another book on concrete floors, go to Concrete Floors on Ground, EB075