Partition Wall STC-71
"STC 71 ratings for Acoustiblok exceed the testing capabilities of most laboratories,” - Kurt Golden, test administrator at Architectural Testing, Inc., York, Pen.
The tested assembly: 8 x 16" concrete block, steel 2x4 studs spaced 1/2" from the block, with 4" mineral wool insulation, and 3mm thick Sound Barrier of Acoustiblok under the drywall.
The acoustical laboratory at Architectural Testing Inc. recorded a remarkable STC of 71 for this wall design. This is a noise reduction in excess of 98% to human hearing.