Patent ID: 7049251

Claim:
A facing material for use with an aqueous slurry of cementitious material, comprising: a porous facing layer at an exterior side of the facing material; the porous facing layer having pores impermeable to liquid water and permeable to water vapor evaporated from said slurry; the porous facing layer having a first coating or saturant, which reduces porosity of an exterior side of the porous facing layer to resist slurry penetration; a slurry facing side of the porous facing layer having a second coating or saturant comprising a slurry wetting agent; a water repellant material on at least an exterior side of the porous facing layer providing the exterior side of the facing material with water repellency to repel rain and water from the facing material, said water repellant material repelling said slurry from penetration through the exterior side of the facing material to prevent slurry contamination on the exterior side of the facing material; and an inner layer having reinforcing fibers at an interior side of the facing material, the inner layer being substantially porous to said slurry for penetration of said slurry through the inner layer.