Armstrong World Industries, Inc., together with its subsidiaries, engages in the design, manufacture, and sale of ceiling and wall solutions in the Americas. It operates through Mineral Fiber and Architectural Specialties segments. The company offers mineral fiber, fiberglass, metal, wood, felt, architectural resin and glass, wood fiber, and glass-reinforced-gypsum; and ceiling component products, such as ceiling perimeters and trims, as well as grid products that support drywall ceiling systems. It also designs, produces, and sources specialty ceilings, walls, and other interior and exterior architectural applications primarily for use in commercial settings; and manufactures ceiling suspension system (grid) products. It serves commercial and residential construction markets, as well as r…