Faced or Un-faced Insulation for Sound Isolation - AVS Forum
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post #1 of 6 Old 11-13-2012, 01:45 PM - Thread Starter
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I've seen this come up before in the past, but I can't seem to find the threads anymore. What is the consensus regarding using faced or un-faced insulation in the walls? Two of the walls in my theater are adjacent to my poured basement walls separated by an air gap. The exterior of the poured wall has a sprayed on membrane and a drainage board applied. So the hydraulic break and waterproofing are exterior to the house. My concern is the double vapor barrier when using a faced insulation.

A quick search of the Lowes sight shows the unfaced R13 is MORE expensive than the faced.

Here's a pick of an exterior wall since you guys like pictures so much biggrin.gif You can see one of the exterior walls on the right. Pretty standard stuff.

DW1.jpg

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post #2 of 6 Old 11-13-2012, 03:31 PM
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Faced or un faced doesn't make a difference neither will put a dent on the sound of a home theater, uśe what is recommended for your exterior walls by your local building officials and the cheapest for the interior.
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post #3 of 6 Old 11-13-2012, 03:36 PM - Thread Starter
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Good idea to call the building inspector!

I should have clarified that I'm just concerned about the vapor issue, not sound containment.

Thanks for the tip, I'll give them a call tomorrow.

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post #4 of 6 Old 11-17-2012, 03:03 PM - Thread Starter
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Checked with our local inspector and he indicated that in this part of the country (Alabama) vapor barriers are not required in a basement. This seems consistent with what I've seen in the basement so far as the humidity down there has been the same or lower than the rest of the house.

However, I've read so many differing opinions online that I'm a little concerned about this vapor business. The walls were not framed with enough space behind them for ridgid insulation, or I would go that route. So, my question is, what have you guys done in your theaters to address potential vapor intrusion.

In case it's important, our basement has a sprayed on waterproofing membrane on the exterior plus a dimpled membrane plus a drainage mat. I would think we would have very little moisture coming from the ground.

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post #5 of 6 Old 11-17-2012, 05:47 PM
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As I understand the purpose of a vapor barrier it is to keep warm humid interior air from condensing on the cold foundation wall, not much to do about keeping moisture out of the basement.
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post #6 of 6 Old 11-17-2012, 06:30 PM - Thread Starter
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That is my understanding as well. I could have condensed my earlier novel by simply saying the air in my basement seems to be very dry biggrin.gif not sure if that has anything to do with needing a vapor barrier or not. There seems to be very little definitive info available for my area, and I was surprised when the inspector said nothing was necessary.

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