AVS Forum Special Member
Join Date: Dec 2005
Location: Parker Colorado
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Drywall will give you better sound isolation. Ted is saying if you do drop, don't bother with green glue or sound clips. Sound isolation is like damming a river. You have to block it all or it will not work, just dipping your hand in a stream will not block the water, it just flows around your fingers to find a way downstream, same with sound. If you do the walls, but the ceiling is open, the sound will flank around your walls and continue into the rest of the house.
As for connecting to the joists, that wall is now not isolated from the house. I used RSIC clips to connect the wall to the joists. You can still continue, but now you need clips along the wall surface to isolate the drywall from the wall itself. (that is basically what I did to isolate my drywall on the ceiling from the joists above.
Next remember mass is best. 2 layers of drywall is always better than 1. Besides you need 2 to have something to place the green glue in between. next 3 is better than 2.
Next, HVAC, electrical boxes, lights, doors, and in Colorado, our floating walls (you did float right?) these are your next weak points that need to be dammed. I used MLV in the floated walls, many people build containment boxed for the outlets and lights, doors can be solid core, add more mass, and weather strip, even makeing a double door (go through two doors to get into the room, not a french door).