Gearslutz.com - View Single Post - Stopping sound transmission: Air only or air and insulation?

badboymusic · 21st December 2008

I have a guitar isolation room almost finished, but cannot find a definitive answer on any existing threads concerning insulating the inside wall. The outside wall is 4 inches thick filled WITH pink insulation, covered with a layer of 1/2" particle board, 1/2" Celotex sound board and 5/8" drywall. Then there is a 1/2" air space between the outside wall and the inside wall. I will be putting another sandwiched layer of particle board. sound board and drywall on the inside of this wall too.

I am wondering; is it best to fill the inside wall cavity with pink insulation too (which would leave a 1/2" air space between walls) or leave the insulation out of the inside wall so I would have 4" of air space between the sandwiched layer and the outside wall?

Which is going to stop sound better; 4 inches of air or 1/2 inch air and 3 1/2 inches pink insulation?

Thanks!

21st December 2008	#1
badboymusic Lives for gear Joined: Jun 2007 Posts: 941 Thread Starter	Stopping sound transmission: Air only or air and insulation? I have a guitar isolation room almost finished, but cannot find a definitive answer on any existing threads concerning insulating the inside wall. The outside wall is 4 inches thick filled WITH pink insulation, covered with a layer of 1/2" particle board, 1/2" Celotex sound board and 5/8" drywall. Then there is a 1/2" air space between the outside wall and the inside wall. I will be putting another sandwiched layer of particle board. sound board and drywall on the inside of this wall too. I am wondering; is it best to fill the inside wall cavity with pink insulation too (which would leave a 1/2" air space between walls) or leave the insulation out of the inside wall so I would have 4" of air space between the sandwiched layer and the outside wall? Which is going to stop sound better; 4 inches of air or 1/2 inch air and 3 1/2 inches pink insulation? Thanks!