Reinforced Glass Mat Sheathing Panel. Developed and made In Canada, and tested for Canadian construction and climates. GlasRoc Sheathing combines reinforcing glass with a protective coating and a water-resistant gypsum core. Long term protection (12 months) to weather exposure. A superior water resistant surface that does not inhibit water vapour permeance. Mould and moisture resistance making a fit for exterior applications. Compatibility with most exterior wall systems and applications. Strength and flexibility, allowing the board to be installed on curved surfaces. Evaluated as an Air Barrier Material to the Canadian Standards (CAN/ULC-S741). Listed as a component of Canadian Air Barrier Assemblies (listed in CAN/ULC-S742). Approved substrate by major Canadian EIFS manufacturers. Visually appealling and easily identifiable. 5 Year Limited Warranty Against Defects. CertainTeed Gypsum ("CertainTeed") warrants that its GlasRoc Sheathing ("Product") shall be free from defects in the manufacture of materials that make it unsuitable for its intended use, and that it meets or exceeds the manufacturing requirements and specifications of ASTM C1177. The 5 Year Limited Warranty and the 12 Month Limited Warranty extend to dealers who sell this Product, contractors who install this Product, and the original owner of the building within the warranty period. Neither the 5 Year Limited Warranty nor the 12 Month Limited Warranty may be assigned or transferred. Please see the complete warranty document for more details. Easy to handle and install as regular paper-faced sheathing. Can be scored and cut with a standard utility knife. No special tools required. Snaps free after scoring only one face. No special fasteners required. Skin irritations are minimized due to our innovative polymer coating. Has uniform field and edge hardness, making trimming and fastening quick and easy.