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Old 09-03-2009, 04:06 PM   #1
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Foam insulation wall cavity soundproofing...


To sound-proof between rooms I'm going to drill down between studs from the attic and put a foam insulation like "Great Stuff" down into each wall cavity. Does anyone have experience doing this?

I'm wondering how much should go down into a standard 16" wide cavity? They say to fill to 50%, but since I can't see down into the hole to see how much that is, I was hoping somebody has done this before... and I don't want to push the drywall away from the studs due to over-filling.

Any suggestions would be great!

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Old 09-03-2009, 05:56 PM   #2
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Foam insulation wall cavity soundproofing...


Great Stuff in a stud cavity? How many cans are you planning on buying?

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Old 09-03-2009, 06:26 PM   #3
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Foam insulation wall cavity soundproofing...


Expensive, and if you get the red can(expanding foam), you could blow out the drywall. Not really a good idea.
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Old 09-05-2009, 04:20 PM   #4
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Foam insulation wall cavity soundproofing...


I doubt that this would be effective at soundproofing. For this purpose fiberglass is the usual choice. Rock wool or mineral fiber is used in most recording studios - you could cut channels in your drywall to squeeze it in between studs, then patch. If you want to improve sound isolation, you could hang an additional layer of drywall - isolate the two layers with a bead of acoustical adhesive (or at least use liquid nails), mud, tape and finish. Also be sure to seal _any_ openings between the two walls - at the base, in the outlet and switch boxes etc. This is often the biggest source of a sound leakage problem.

This company makes a number of acoustical products.
http://www.auralex.com/c_studio_cons...nstruction.asp

Good luck.
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