Modern stucco is used as an exterior cement plaster wall covering. Much of this ornament is carved stucco (plaster) rather than stone. Wall finishes are concrete, plaster or timber panelling. Limestone was burned at high temperatures in order to manufacture cement, plaster, and stucco. Historically, the application of stucco was quite similar to the process of applying lime plaster. Ceilings are plywood panelling, timber battened, plaster or concrete. Marble sculptures were ground to powder to make lime for plaster. Interior surfaces sometimes receive a final layer of gypsum plaster. Gypcrete is a mixture of gypsum plaster and fibreglass rovings. Gypsum lath was an early substrate for plaster. These are added to powdered products like cement, plaster and detergents. The rock was covered with a lime plaster which was painted. Ancient Greek buildings of timber, clay and plaster construction were probably roofed with thatch. They were made of brick covered by plaster. The wooden surface was sometimes primed for painting with a layer of plaster.