You might want to try an alternative, spray-applied rockwool. Has a r-value of 4.14 per inch. It's is green, the very best sound proofing qualities, no orders, chemicals or VOC's. It meets air-barrier standards. Can be sprayed on horizontal surfaces up to 5 1/2" or 7 1/2 in a sloped ceiling. It's also less costly.
Rockwool Premium Plus
Steve |