"To stay on schedule, especially for fast-track projects, general contractors may be tempted to have floor coverings installed on concrete slabs regardless of the water-vapor emission rate of the slab. But before assuming responsibility for floor-covering performance, they should assess the probability of distress, which may include loss of adhesion between the covering and the concrete.
Some flooring installers try to determine the effect of water-vapor emission rates on flooring adhesives by conducting bond-and-moisture tests. Small flooring mats are adhered to the floor, and, if after three days, an unusual amount of force is required to lift them from the subfloor, the mats are considered to be securely bonded. However, the results of bond-and-moisture tests are qualitative rather than quantitative. To gather measurable data, The Aberdeen Group studied the effect of water-vapor emissions on the bond strength of several different floor-covering adhesives by using a pull-off testing method that was developed to evaluate adhesion of epoxy compounds to concrete surfaces. "