Does this need to be installed over extg. Sheet rock? We are ripping our extg. Rock down. Wow this is expensive ...$45 a board. We might be using it because we live on a busy road. Thanks
Gary the last time I used quiet was in a hospital and they had us use the plastic vapor barrier cut long so they could use the acoustic sealer top and bottom. Put down a heavy bead then stick the plastic in it till dry. It's been a while ago and I don't remember why the man in charge of that part of the project made us do it. Maybe it's changed since then, it's something you don't work with very often.
What is "extg"? I assume you were referring to exterior-grade sheetrock, which is weather-resistant and typically installed on the outside of a structure, under carports or covered porches.
As far as I'm aware, Quietrock is intended to be installed on the interior side. If by chance you have exterior-grade installed inside your home, you can certainly go right over the top of it with the Quietrock. The double-layer will provide even more mass, in turn, absorbing more noise. If you want to go all crazy, you could even apply http://www.greengluecompany.com/ between the layers, for addition sound-deadening.
I'm still assuming that "extg" is exterior grade...
The install instructions don't mention that requirement, do they? (by the way, add acoustical sealant (QuietSeal), if this is to be your primary layer of drywall)
And you're confusing me again. You thought it had to be installed over exterior grade sheetrock, but earlier you said, "We are ripping our extg. Rock down".
You got one heck of of a deal where I am quiet rock is $100 a sheet. But I also am confused by extg The quiet rock doesn't go over anything. But it does take special sealant top, bottom, and seams to get full effect. If I remember right it's the same as 7 layers of 1/2" drywall.
OK that's better and no you really don't wan't to do that. If I remember right it takes a vapor barrier behind it.That plastic is then sealed top and bottom with acoustic sealer-chaulk-also you must seal around switches and outlets.
If you just put this over your existing all door and window opening will now have to be redone all outlet and switches will have to be extended.
I must have missed the - "takes a vapor barrier behind it" part, where was that? The drywall (STC 51) rating is the same as using Roxul insulation in the cavity, though cheaper? http://quietrock.com/datasheets/func-startdown/52
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