USG’s Sheetrock glass-mat liner panels feature a noncombustible, moisture- and mold-resistant gypsum core encased in moisture- and mold-resistant (ASTM D3273 score of 10) glass mats. They can be used in any fire-rated cavity shaft wall and separation wall system assembly where regular Sheetrock gypsum liners are specified. The 1"-by-24" panels feature double-beveled edges and are available in 8', 10', and 12' lengths, as well as custom lengths. They also comply with ASTM C1658, C1396, ASTM E136 (noncombustible gypsum core) and ASTM E84 (flame spread 20, smoke developed zero), and are UL-classified for fire resistance, surface-burning characteristics, and noncombustibility. usg.com