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I bought enough 3-inch-thick Rockwool to sufficiently treat my studio's walls, but building (ideally) 11 wood frames does not sound fun. If I were to wrap each piece in a thin but sealed plastic (to keep it from shedding) and hang that on the wall, would its absorption be adversely affected in any significant way?

It's a 9' by 9' room with 8' ceilings. I'm sitting 3' away from my monitors (speakers).

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The answer to your immediate question is no, wrapping Rockwool in plastic doesn't adversely affect sound absorption at all.(1)

But I'd like to also answer a more general question you didn't ask, i.e. how to do a good job in your studio, and my suggestion would be that before you start your work you should read as much as possible, and watch as many videos as possible, on the subject of fixing up a good home studio.

Once you start the work, it'll be difficult to change things. But if you invest some time in advance in study and research, you'll almost certainly get a better result and avoid a lot of mistakes. These days there are many good youtube videos on the subject, and if I were you I'd probably watch everything that I could find on the subject, before finalizing my own project and getting started with the work.

(1) For the record, thin plastic (or thin anything) has a modest absorption effect on the highest frequencies, and no effect at all on medium and low frequencies.

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  • Thank you for you're answer. I have watched many videos on the subject before deciding which insulation product to buy and how to position the panels. I'm just lazy :) – Green Plasma Aug 15 at 16:30

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