Insulation existing interior walls for sound?

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Old 10-27-19, 09:28 AM
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Insulation existing interior walls for sound?

Hello, for our two upstairs bathrooms, I was wondering about options to insulate a few key walls for sound? There are some real sound issues coming from a couple of walls.

Can I blow in some insulation or would removing the drywall and installing batts of mineral wool be the best?

I see there is now blown-in mineral wool...would this be better than cellulose?

Unfortunately we really can’t add another layer of drywall without doing some major changes as the space is limited.

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Old 10-27-19, 12:28 PM
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You are limited in what you can do with a 2x4 wall. The amount of difference you will see between different types of insulation is quite limited by it being only 3.5" thick. Is there a big difference in insulation? Yes. You just won't notice a huge difference with so little thickness. So I wouldn't fret about what to use too much.

If you won't be removing drywall to insulate, blow- in is your only option. Adding density alone will probably be your best bang for the buck. What type probably is pretty immaterial. I would probably just use cellulose.
 
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