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This has probably been mentioned here before but searching didn't turn up anything. I stumbled across the above web site some time ago- Can't remember who or where I got it. Seems like they have a lot of products for sound proofing. Any body ever dealt with them or maybe they are an AVS member that I am not aware of?

http://www.soundproofing.org/index.htm


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I've never dealt with them, and I'm not an expert, but I had a look at the site.


The lead sheeting that "Also blocks radiation from Nuclear Attack" was amusing.


On http www soundproofing org/infopages/basement html

they write

"We knew the biggest problem would be the sound going up and out through the ceiling, which is actually the flooring above. So we applied "soundboard" between the rafters, against the underside of the floor above, then caulked it in place. We then ran resilient channel across the joists and attached 5/8" drywall to them after first lining the drywall with a thin layer of "Super Soundproofing Mat" facing up. We installed ceiling hangers for attaching a dropped ceiling by drilling through the drywall to the joists. "


The last step, the screws into the joists, bypasses the RC and the Mat.


Sticking a 2" thick mat over an existing door, cut larger than the door to act as it's own seal, was interesting.


Sticking a "a layer of Celotex ceiling tiles" on the walls may absorb a lot of high frequency sound, giving a boomyness to the room.


This page

http www soundproofing org/infopages/channel htm

appeared perfect to me. Although some people say that the cost of soundboard (hemosite) is more expensive than just adding two layers of gypsum.


I'm considering putting in a room-within-a-room which requires ceiling joists. Unfortunately I've also got a steel I-beam in the middle. The mats this site sells might help on top of the I-beam.
 
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