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Posted by Michael Bulatovich on March 13, 2007, 1:17 pm
>I would guess one is rated in thermal terminology Rx
> and the other in sound transmission coefficient
> terminology STCx. Just a guess. Same stuff . No vapor
> barrier needed for STC.
>
> Also the STC will be proportional to the weight of the
> fiberglass so panels like Corning 704 being much denser
> will have better sound ABSORPTION characteristics at
> low frequencies.
>
> Maybe try that question here if your interest is sound
> not thermal.
> http://www.recording.org/forum-34.html
>
> peace
> dawg
> :I was asked today what the difference between sound
> attenuation batts
> : and regular insulating fiberglass batts is. Anyone
> know?
Not much really. Batt thickness, and the binder (it's a little more dense).
You can get close to the same performance acoustically from the thermal, if
that's where you're going with this.
--
MichaelB
www.michaelbulatovich.ca
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