Patent ID: 6398976
Filing Date: 2002-06-04
Classification: C04B,D21J,E04B,E04D,Y02W,Y10S,Y10T

Abstract:
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.