USG’s new Sheetrock Brand EcoSmart Panels Mold Tough Firecode X may be an industry first in lightweight and sustainable 5⁄8-in. Type X gypsum wallboard. Still moisture and mold-resistant, this wallboard was designed to meet the Architecture 2030 Challenge for Products. The wallboard features up to 94.6% recycled content, is GreenGuard Gold certified and Living Building Challenge compliant. The wallboard still offers sound, strength, sag and impact resistance, and is UL classified as fire resistant, with surface-burning characteristics and non-combustibility. Compliant with ASTM C1396.