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Coated roofing insulation and roofing systems including such insulations

  • US 6,398,976 B1
  • Filed: 09/20/2000
  • Issued: 06/04/2002
  • Est. Priority Date: 02/18/1999
  • Status: Expired due to Term
First Claim
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1. A method of making a coated roofing insulation board, comprising:

  • mixing together the following ingredients in water to form a slurry;

    expanded perlite about 45% to about 76% by dry weight;

    cellulosic fibers about 15% to about 45% by dry weight;

    latex binder about 0.1% to about 10% by dry weight;

    bituminous material about 2% to about 9% by dry weight; and

    alum about 0% to about 3% by dry weight;

    forming the slurry into a wet mat;

    applying a coating comprising, by dry weight about 48.3% to about 96% filler;

    about 3.1% to about 33.3% latex; and

    0% to about 34% sodium silicate, to a first major surface of the wet mat; and

    drying the mat and coating to form a coated insulation board.

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