The sound is actually transferring through the building structure itself.which could be the case if the shared firewall is stick framed.As such, it may be a whole lot easier to soundproof that wall, rather than your floor. The sound is coming through the shared wall in your garage.the Drycore is maybe where this gets a bit over-engineered, but it does provide a form of an air gap underneath.Īll that said.you state that the sound is transferring into your neighbors condo which is 'diagonal' from your current room.It will also help pad the XPS from the drycore the cork is fairly cheap, and does the same as the XPS but as a different material, should help reduce sound transference.It also completely docouples your finish floor with the subfloor in terms of any direct fasteners (helps reduce transference) the XPS, when taped and sealed, would be an additional air barrier, which should help with transference.I'd suggest a sandwich of XPS foam, topped with cork underlayment, then your finish floor (which, ideally, could be dry-core subfloor panels topped with carpet).īUT.note that I am not an acoustical engineer of any sort and the above is just pure speculation. My thoughts would be to try insulation along with layering some dis-similar materials to avoid conductive transfer. I don't know what Green Glue is other than it appears to form a gasket of sorts. I'll post details here in a few weeks to report my progress and also post pics. Note that the cement board is not for soundproofing in and of itself, but to provide a second firm surface to allow the GG to perform at its best. I will then turn up my subwoofer, run down to my garage directly beneath it, and, if the MLV doesn't appear to be performing to my expectations, I will start my plans to put down cement board with Green Glue in between. What I am going to do first is lay down 2-lb MLV, acoustically caulk it, and tape it. The cement board is heavier and stiffer than plywood and will offer better performance. If height is what prevents you from using 1/2" plywood or greater, consider using 1/4" cement board (Hard Backer) instead of the plywood. We would recommend using the heaviest & thickest material that you can.1/4 plywood is going to be a bit too light & thin. In response to me basically asking him the exact same thing as in my original question: Answering my own question here with an email response from a Green Glue associate.
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