Why do certain sound control products “appear” to have higher STC ratings?
a. The reason for obtaining a higher STC rating is based primarily on the structure used and not on the underlayment. 1) e.g., STC is for airborne sound and is controlled mostly by mass. A 6″ concrete slab has an STC of about 54. An 8″ concrete slab has an STC of about 59. With QTscu, QT Sound Insulation the STC of an 8″ concrete slab with no ceiling is STC 60.
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- Why do certain sound control products "appear" to have higher STC ratings?
