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Two layers of drywall and Green Glue

Another YouTube video: layering drywall

I have to admit: I never get tired of seeing other people's soundproofing videos. Here's a video from Acoustical Surfaces that shows two guys building a wall out of 2x4s and insulating them with cotton batts, and then layering two sheets of drywall over each side. They make sure not to overlap the seams between the two layers, and they use two tubes of Green Glue on each 4x8 sheet of drywall.

We don't get to hear the results, but if I were them, I might have either staggered the wall studs (since they were building the wall from scratch), or put soundproofing green tape (aka "joist tape") on every other stud to keep the first layer of drywall from touching the wood (a "fake" staggered wall).

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