This invention relates to a low fiber, plyable facer suitable for use in the construction industry, particularly for insulation board manufacture, comprising a dry preformed fiber mat containing a binder for the fibers, preferably a preformed glass mat, coated with a prefoamed composition which contains a polymer latex, a foam sustaining amount of a surfactant and a flame retarding and/or strengthening amount of a mineral filler and also to the use and process for the preparation of the above as well as to a siding underlayment or insulation board having a foamed, thermosetting resin core which is surfaced with said facer as a product for commercial use.
CROSS-REFERENCE TO RELATED PATENT APPLICATION
This application is a continuation-in-part of Ser. No. 09/376,247, filed Aug. 18, 1999 now U.S. Pat. No. 6,368,991 which is a continuation-in-part of Provisional application Ser. No. 60/099,451, filed Sep. 8, 1998. Related U.S. Pat. No. 6,365,533, issued Apr. 2, 2002.
