CTI provides inspection services for ceiling materials related to building materials and construction projects. "Building keel inspection items: ceiling static load test. Gypsum board inspection items: appearance quality, size tolerance, diagonal length difference, wedge edge section size, protection Cohesion between face paper and core material, moisture deflection, breaking load, flatness, right angle deviation, unit area quality, bonding of face paper and gypsum core. Testing of supporting types of gypsum board: paper-faced gypsum board, decorative gypsum board , Decorative plasterboard."