I live in a townhouse that has attached units on both sides. One of the attached units has its family room right next to my family room and I hear their TV, stereo, talking all the time. I'm trying to reduce the sound coming from that wall. Yesterday I tore down the existing drywall, which was 5/8" and was surprised to see insulation in the interior wall. I thought I was going to need to insulate it. I was also surprised to see a resilient channel used on the other side. I thought both sides were nailed into the 2 x 4 studs. My side was. The wall is about 16' x 8'. I installed 28 whisper clips, 25 gauge hat channel, two layers of 5/8" sheetrock with about 2.25 tubes of green glue between each 4 x 8 sheet. I also used putty pads on the adjoining walls outlets and green glue sealant around their wall and mine (including the 1/4" perimeter of my wall, outlets and in between the seams of the new drywall. I was careful not to short circuit the decoupling as has been mentioned in other threads. I also overlapped the seams of the two layers of sheetrock. I'm letting the sealant cure before taping and finishing the wall. So far there is a difference in the amount of sound coming through the wall, but it's not as much as I hoped for. I'm wondering if it will make noticable difference if I add one more 1/2" layer of sheetrock with green glue? I know there are flanking issues but it still seems there is noise coming directly through the wall, especially when I put my ear up against the wall. I know it would be more effective if the source side is soundproofed, but that is not an option. I'm skeptical adding another layer of sheetrock with green glue will help much in my situation. Any advice will be appreciated.
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9/18/11 at 7:55pm