I would ask Ted or Brian directly (as I am now very, very interested in this product), but others may benefit as well...so I'll ask here. Anyone else who has familiarity, please chime in as well.
1) Staggered Drywall-Do you recommend the common approach of staggered and sealed layers of drywall (i.e. seams don't overlap other seems exactly, each layer is taped, caulked, etc.), or is it better to sandwich individual drywall sheet over another sheet in a flush manner, or does it not matter?
2) The Sirens' Song-The allure of NOT having to reframe a room inside a room to get good isolation results is truly a sirens' song for me. This would leave me with significantly more finished room in my existing 15'x21'x9' room, as well as decrease my labor costs (i.e. my time) greatly (not to mention material costs). Is it silly of me to hope that using this product applied at 100% coverage with new drywall over the existing, painted drywall and ceiling may approach the isolation provided by room inside a room? Sounds to good to be true, but I am hoping. As an example, if I measure 75 dB of sound pressure in the room (which is currently my media room, soon to be converted to dedicated home theater room) from a typical musical source (i.e. lows, mids, and highs), I maintain about 73 dB of pressure, seemingly ALL from about 400 hz or less, in the master bedroom above. This "low frequency concert" does not bode well for WAF. I need to lower this to livable (i.e. sleepable) levels if I am to succeed in my sound isolation endeavors. Please address this issue for me if possible. I realize room in a room AND GG would be probably better, but help me out here.
3) Insulation-Related to number 2 above, if I were to go the route of new drywall over old with GG in between, should I cut holes strategically in the existing drywall to fill cavities with batting or other insulation, and then patch the holes before applying GG and new layer?
4) Rigid Coupling-By now you see I am no expert, but it seems to me that firmly attaching both layers of drywall to the existing studs with drywall screws would negatively affect the isolation by providing tightly coupled escape routes for vibrations. How is this countered by GG? Or, am I way off base here?
5) Peaks and Valleys-Lastly, and this is just to satisfy my overactive curiosity, after the toweled application of GG, does applying the outer sheet (in my case, drywall) leave air pockets in the trowel valleys of the wet green glue, or does it press the glue into a normalized, solid layer?
Thanks in advance. I hope answers to these questions will be useful to others here as well. I'm looking forward to ordering some of your new product in the next few weeks. I think I hear the sirens singing now