Does anyone know where I can find the STC of standard fiberglass insulation vs. rockwool?
My best suggestion is to try manufacturers# web sites, but you may have to ask, since neither product is designed specifically for reduction of sound transmission.
Seat-of-the-pants guess is there won't be a dime's worth of differenece.
Architect (NY) and Home Designer (PA)
As Richard suggested, batt insulation, contrary to manufacturers claims are not designed for sound deadening. There are several manufacturers who produce sound deadening products.
Knight-Celotex sells a sound deadening fiberboard panel that can acheive stc ratings of over 60 in certain wall systems.
Homasote also sells a similar board that performs equally.
Of these two, Celotex's SoundStop is much more affordable than the Homasote 440 board. Both boards are also great for retrofit applications.
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