What are STC Ratings
An STC (Sound Transmission Class) rating is a single number rating that is used to specify and compare different partitions according to the reduction in noise levels that the partition provides. The sound transmission loss performance of a partition is measured using ASTM E 90 “Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements” and calculated according to ASTM E 413 “Classification for Rating Sound Insulation.” As a general rule, the higher the STC rating, the better the partition’s acoustical performance.
