1/2" Securock® Glass-Mat Sheathing, 4' x 8' Glass-Mat Sheathing panels with moisture and mold resistance that are encased in a coated fiberglass facer mat to maximize a coverage of air/water barrier systems. Available in both 1/2" and 5/8" (Type X) thicknesses. Benefits are: Mold-Resistant: high resistance to mold and mildew (10-score in accordance with ASTM D3273) Resists Water & Exposure: glass-mat sheathing facer on both sides that sheds water and can be exposed to weather for up to 12 months after application. Quick, Dry Installation: no sawing or special tools required. Simply score and snap. Data Sheet