Sound-rating values are the result of a combination of components. A single product or system will not produce the desired results. Rather, the builder must assemble a “package” that works to the desired effect. This package includes the substrate, underlayment, bonding material, flooring, and the ceiling systems below.
Most municipalities request that sound-control tests be conducted by independent laboratories that describe the package used, and certify the results for Impact Insulation Class (IIC) and Sound Transmission Class (STC).