GlassRey® exterior sheathing board is a gypsum board made of an incombustible, specially treated core that provides resistance to water absorption, protected on both sides by a mold and moisture resistant fiberglass coating. It assures good performance up to 12 months as a cladding substrate on the outside of the buildings against degradation, delamination, and deterioration of use on normal conditions, or if exposed to normal weather conditions, such as UV rays, rain, wind, ice and snow.

GlassRey® presents dimensional stability, which guarantees resistance to deformation, undulation, and deflection on uniform surfaces. Given the glass mat fiber distribution, it is highly resistant to bending in both directions, therefore, it may be installed in a vertical or horizontal position to structural wall elements, according to standard installation recommendations.