Electron beam curable resins or ultraviolet light curable resins can be used in combination with filler and other additives to make coated facers that can be used on insulation boards. Also disclosed are facers made of such composition, the process for making said facers and their use in insulation, building and construction boards. More specifically a flexible facer can be made by a process that comprises (1) applying a monomeric composition to a fiber mat, wherein the fiber mat is a non-asphaltic, non-cellulosic fiber mat, and wherein the monomeric composition is comprised of at least one monomer and/or at least one oligomer, and a filler, (2) initiating polymerization of the monomer within the monomeric composition by exposing the monomeric composition to ultraviolet light or an electron beam, and (3) allowing the monomer to polymerized to produce the flexible facer.
