Patent ID: 7785703

Claim:
A facer for improving the fire resistance and weathering properties of a polymeric material roofing board, comprising: a fire and weather resistant fiberglass-based facer having a length, a width, and a thickness; the fiberglass-based facer having first and second major surfaces that are each defined by the length and the width of the fiberglass-based facer; the fiberglass-based facer comprising a fiberglass mat having a Gurley Porosity of at least 300 and being substantially impervious to a passage of hot gases of combustion and water vapor through the thickness of the fiberglass-based facer; and the fiberglass-based facer having a structure for permitting a limited penetration of a liquid polymeric mixture through the first major surface of the fiberglass-based facer into, but only part the way through, the fiberglass-based facer when the fiberglass-based facer overlies the liquid polymeric mixture during the formation of a polymeric roofing board from the liquid polymeric mixture to effect a strong bond between the fiberglass-based facer and the polymeric roofing board thus formed without permitting the liquid polymeric mixture to pass through the fiberglass-based facer to the second major surface.