Will "Great Stuff" expanding foam provide any sound blocking? - AVS Forum
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post #1 of 7 Old 04-29-2009, 11:17 PM - Thread Starter
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Hello acoustic experts,

I bought a can of "Great Stuff" expanding foam spray tonight to use in some holes I had to drill in my ceiling joists to run speaker wire for a 7.1 setup. I thought I might try to spray some of it into the outlet boxes in my daughter's room next door to try and get a better acoustical seal between her room and my theater. Will this provide any benefit or am I just wasting my time? If it does provide benefit will it be noticeable or should I still spend the money and get a decent acoustic caulk instead?

Thanks,
Mike
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post #2 of 7 Old 04-30-2009, 04:15 AM
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Well it would make it "air tight" but it is also a closed cell rigid foam so adds to coupling. I used the stuff around my door frame, but nowhere else since it's never been recommended over the alternative (caulk and/or putty pads).

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post #3 of 7 Old 04-30-2009, 06:31 AM
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If you have access to the rear of the boxes putty pads are a better alternative.

I would be very leery about filling an electrical box with that foam. It expands to fill every nook and cranny. If you have to do any further work in the box or even just replace the cover you will have a big mess on your hands.
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post #4 of 7 Old 04-30-2009, 06:37 AM - Thread Starter
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Thanks guys, I think I'll just fill the ceiling joist holes I cut and leave it at that.

Mike
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post #5 of 7 Old 04-30-2009, 06:52 AM
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Also, you can get acoustic caulk for fairly cheap. May as well use what's best.

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post #6 of 7 Old 04-30-2009, 07:54 AM
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I also used it around a couple of doors where my poor rotozip skills cut too much of my second layer of drywall, but I added acoustic caulk at the first layer of drywall. As mentioned, it really expands. I wouldn't think it would be a good idea for outlet boxes.







Good luck.

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post #7 of 7 Old 04-30-2009, 08:46 AM
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Quote:
Originally Posted by BIGmouthinDC View Post

If you have access to the rear of the boxes putty pads are a better alternative.

I would be very leery about filling an electrical box with that foam. It expands to fill every nook and cranny. If you have to do any further work in the box or even just replace the cover you will have a big mess on your hands.

Completely, totally agree.

Frank

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