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Old 04-11-2008, 08:45 AM   #16
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Soundproofing a Semi party wall


Can you attach resilient channel directly to brick? Like I said in a previous post, I have very little room (thickness) to work with. Whatever I build will have to be 2" thick or less.

As for the addition of mass, the Quiet Rock's ability to dampen sound isn't necessarily attributable to its density. According to the website, it's attributable to its ability to convert sound energy into heat, rather than transmitting the sound through the sheet. I believe Green Glue has a similar mechanism.

I think that at the very least, 1/2" of Quiet rock should hopefully cut the sound by at least half.

Any idea how much sound dampening potential I'd be giving up by attaching the quiet rock directly to furring strips rather than resilient channel?

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Old 04-11-2008, 09:01 AM   #17
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Soundproofing a Semi party wall


I have a book that outlines the STC of various materials and techniques. STC is Sound Transmission Coefficient if I remember correctly off the top of my head. The Book is JLC Best Practices manual. I do not have it at my desk at work. PM me if you want me to lookup the STC of various techniques. The book compares one technique to another, resilient channels vs. none, insulation vs. none, Drywall vs. double vs. 5/8", etc. The book also outlines general best practices for reducing sound.

Its a great book, STC is only one of hundreds of topics.
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Old 04-11-2008, 09:29 AM   #18
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Soundproofing a Semi party wall


Thanks for the offer--greatly appreciated. I've managed to find some excellent information on the internet, though.

Check this out:

http://www.maconline.org/tech/materi...ta/ssdata.html

This is specific to masary walls (and party walls in my case). I'm 2 4" widths of brick, so i'm around STC 52 as it is. You'd think that would be good enough, but when my neighbor has a sing-along (scream-along) session at 10:30pm, it sounds like a screaming dying cat... Hopefully some Quiet Rock or Green Glue willd drown him out.
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Old 04-11-2008, 09:43 AM   #19
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Soundproofing a Semi party wall


Quote:
Originally Posted by peace_and_quiet View Post
Thanks for the offer--greatly appreciated. I've managed to find some excellent information on the internet, though.

Check this out:

http://www.maconline.org/tech/materi...ta/ssdata.html

This is specific to masary walls (and party walls in my case). I'm 2 4" widths of brick, so i'm around STC 52 as it is. You'd think that would be good enough, but when my neighbor has a sing-along (scream-along) session at 10:30pm, it sounds like a screaming dying cat... Hopefully some Quiet Rock or Green Glue willd drown him out.
I would think you would want to strive for 80+ and the only way to get close to to decouple new from old.
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Old 04-11-2008, 10:31 AM   #20
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Soundproofing a Semi party wall


In talking with the guys who did our drywall, it turns out they did in fact use resilient channels (vertically) against the brick (so i guess you can attach them directly to the brick with tapcons). However, we still hear quite a bit of airborne noise - is this because I have not caulked yet? I didn't want to bother caulking as I figured that I would have to remove the baseboard anyways if we put up a second layer of drywall with the green glue (since we still hear sound). Of course, it could also be because they did not install the channels properly, but I was wondering if the open cracks were a greater cause. We are only really looking to dampen the voices and higher frequency noise. Any suggestions are appreciated!
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Old 04-11-2008, 11:11 AM   #21
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Soundproofing a Semi party wall


Well, the resilient channels could have failed--apparently it's pretty common for them to 'short circuit.' I think that's where the channel collapses and begins to transmit sound.

I don't know how much more reduction you'll get out of the caulking, though I'm sure it'll help somewhat. I think your best bet would be to go the green glue route. You've already got one layer of drywall up, all you have to do is smear the glue on a second layer and screw it to the first. That would probably make more of a difference than the caulking, I would think.

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