A lightweight, sag-resistant ceiling board ideal for texturing with all the attributes of CGC Sheetrock® Brand UltraLight Panels. CGC Sheetrock® UltraLight Interior Ceiling Board Sag-Resistant panels are designed to meet the need for a ceiling board that offers excellent sag resistance, even when wet textured. These superior-grade panels are only 12.7mm (1/2") thick, but offer significantly improved resistance to sag when compared to 15.9mm (5/8") Type X panels.