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How much would Quietrock reduce the ICC of a wood floor structure if used as a replacement for standard 5/8 Type X gyp board?

Answer: QuietRock would have little to no discernible affect on the IIC rating of a wood floor structure. Acoustically damped panels such as QuietRock which work (via the process referred to as "constrained layer damping"), provide an increase in the assemblies STC rating (Sound Transmission Class - a rating describing attenuation of airborne noise), but have been found to have little to no effect on increasing or affecting the IIC rating (IIC - Impact Insulation Class-a rating describing attenuation of impact or structurally transmitted noise).