You may want to review the acoustic treatment thread at the top of the forum to see the flavor of the month for screen walls. It used to be two layers of linacoustic with a layer of poly in between. Things have changed a bit. For myself, I will be using Roxul S&S in between my front studs, then a layer of linacoustic in front. Then I will be layering a wall of speaker cloth in front of that to stop any fibers from floating around. But again, check the acoustic thread unless one of the heavy hitters answers next and fast tracks you some more info.