Patent ID: 8568544

Claim:
A fibrous mat-faced cementitious article comprising: (a) a cementitious core, (b) a first fibrous mat comprising polymer or mineral fibers, the mat having at least a first surface facing the cementitious core, (c) a hydrophobic film having a thickness of at least about 25 μm disposed on at least the first surface the mat, the film comprising talc, wax, a hydrophobic resin, a silicone-based compound, a fatty acid or salt thereof, polyethylene glycol, a hydrocarbon or fluorocarbon surfactant having 12 or more carbon atoms, or a combination thereof, wherein: (i) the hydrophobic film is in contact with the cementitious core, and (ii) the first fibrous mat bearing the hydrophobic film adheres to the cementitious core such that no greater than about 50% of the thickness of the first fibrous mat is embedded in the cementitious core.