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In my recording studio we used Rockwool. really nasty stuff to work with but it beats the pink stuff hands down. You can use a silicon based glue to put on the joists and then screw the first layer of 5/8" drywall. Then put another coat of silicon based acoustic sealant on the first layer and put the 2nd layer of 5/8" drywall on that and screw it in. I think my depth of rockwool is 12" rockwool. Hope that helps, contact me if you need more info.
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