I am late to the party, but no, I did not sub the celotex for drywall, the wall I built was 1/2" DW, 5/8" Celo, 5/8" Dwall.
Of course the other leaf was just 2 sheets 1/2" Dwall. All worked well for me. I wonder if I should have built the other wall with 1/2" celo, but like I said.......
It is working well, I will really know in two weeks when I start cutting drums again.
Currently I can crank my soffit mtd monitors to about 93db and go into the other room and hear nothing.
I havn't any pictures, however read steves announcement... I did glue my surfaces together. As I recall reading back in 98 that the screws will transmit sound.
Bryan
I Use OSI #38 Drywall adhesive. I screwed down the 1st surface and glued the subsequent one(s)
I use screws to mount the drywall till the glue sealed, then I removed the screwes and plugged all the holes with USG Acoustical sealant. (the second set. I use plain ole silicone on the 1st set of walls.