Too good to be true? This might be a miracle material for NYC apartments. It's called QuietRock and is made by Quiet Solution. The material is made to replace standard gypsum board... It is marketed as "sound proof", which really made our ears perk up. The 5/8" thickness has an STC (Sound Transmission Class) rating of 51-72. The higher this number, the better. Most residential wall and floor construction has an STC rating of more like 25 to 35. So, we're interested. Otherwise, QuietRock acts just like normal drywall. You hang it up then mud it and paint it. Could this cure those neighbors who sound like they're bowling upstairs? Also check out QuietWood, a sound-proof plywood alternative.