I came across this white paper (Making Walls Quiet) through my Commercial Construction Management Bulletin subscription. It talks about the use of Quiet Rock Soundproof drywall which claims that the STC’s achieved are far greater than typical methods due to potential installation errors. Then I checked the HKS Masterspecs and found out it has been included Section 092900 Subsection 2.4 – C for Acoustically Enhanced Gypsum Board. I wonder if anyone has used this type of gypsum board before and if they have any feedback on its quality and potential. The product is from Quiet Solutions division of Serious Materials. This is a good article to throw out for the knowledge of all or as a reminder of its existence.