wall (e.g. two 4 in block walls separated by a 2 in airspace) is greater than a single wall of equivalent mass (e.g. homogeneous 8 in block wall).

Definition

The STC or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. A higher number indicates more effective sound insulation than a lower number. The STC is a standardized rating provided by ASTM

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