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Lightweight acoustical system

  • US 6,296,075 B1
  • Filed: 06/02/2000
  • Issued: 10/02/2001
  • Est. Priority Date: 06/02/2000
  • Status: Expired due to Term
First Claim
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1. An acoustical system comprising:

  • a water-impermeable layer;

    an underlayment adjacent to the impermeable layer, the underlayment including a first fibrous layer and a second fibrous layer, the first fibrous layer having a density less than a density of the second fibrous layer;

    the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls; and

    a semi-permeable layer disposed between the first and second fibrous layers.

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