Superior Strength GlasRoc® Sheathing integrally bonds its face coating to the moisture resistant core, resulting in a superior protective sheathing that will perform in all climates. Dimensional Stability GlasRoc® Sheathing resists delamination, rippling, buckling and sagging caused by environmental conditions, such as freeze/thaw, heat and humidity, and direct UV exposure. This technology, with its fully embedded glass mats, makes GlasRoc® Sheathing state-of-the-art, and will provide a flat and uniform substrate for EIFS applications. Moisture Resistance When properly installed, GlasRoc® Sheathing blocks liquid water without inhibiting water vapor transmission. The result is a protective surface that is extremely resistant to water damage. Easy to Install GlasRoc® Sheathing is easier to handle and install. No special tools are required. Score it with a standard utility knife. Install it with standard sheathing fasteners.