Alternatives to mass-loaded vinyl?
I know the green building community is not overly keen on PVC (for good reason), and I certainly do not want to put it inside my building envelope if I can help it. Unfortunately, one of the more useful sound dampening materials is mass-loaded vinyl, or MLV. Does anyone have any alternatives to MLV for cheaply adding weight underneath flooring for sound dampening purposes? All I can seem to think of is concrete or gypcrete, or perhaps some generic rubber sheets.
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