hardwall adjective 1noun 1 adjective1 •Made from rigid materials such as wood, metal, or fiberboard.The Hardwall Flat[…]Figure 3 shows how a soft or hardwall flat can be made to stand on its own, away from a studio wall. — 1976 noun1 •A strong grade of gypsum plaster, used primarily as an undercoat.Hardwall-grade calcined gypsum ( +90 percent Casoy ) passes over a vibrating scrcen fitted with a 50-mesh screen — 1950
