Is fiberglass better than mineral wool or foam in terms of acoustical performance?

Yes, it is!  Our high density (6 PCF) Johns Manville Acoustic Fiberglass board provides superior sound absorption when compared to other materials. For our 1″ and 2″ thick panels, the performance of our fiberglass is better than same thickness of foam, Mineral wool, or Owens Corning 703.  Also, our core material is quite rigid, so a wooden frame is not required.

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