The live33st soundproofing project

After much discussion and debate with the consulting company we decided on a multi pronged approach to reducing sound transmission among the units.  The primary culprit in poor noise suppression in multi family buildings is sloppy install and ill conceived products.  Simply stuffing a floor joist cavity with insulation does little to reduce impact noise or vibrations, so we have to decouple the lower level ceiling from the upper level floor.  That is done with a rubber clip to hang the drywall off of.  In order to muffle the sound more, a layer of mass loaded vinyl is also installed between the drywall and floor joist. Once this is done the drywall needs to be carefully detailed and the gaps between floor and ceiling caulked to reduce sound transmission.  Overall this should work, but we wont really know until we try it. Having carpet would have enhanced this effectiveness, but these days nobody likes carpet.  

Drywall hangs of the metal channel, and is suspended on a rubber isolation clip.