Continental Building Products Plasterbase is a base layer 1/2" gypsum board for interior veneer plaster-finished walls and ceilings. The board has a non-combustible gypsum core, covered with paper facings on the front (blue), back, and long edges. The special-bonding blue veneer face paper creates an optimum plaster “working” rate and increases plaster adhesion. The board will accommodate up to two veneer plaster finish coats. Designed as an enhanced fire-resistant base layer for veneer plaster systems in both residential and commercial construction applications. Uses: Interior walls and interior ceilings.