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, resin, 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 renovation of existing buildings sectors. The company sells its products to resale distributors, ceiling system contractors, wholesalers, and retailers comprising large home centers. Armstrong World Industries, Inc. was founded in 1860 and is headquartered in Lancaster, Pennsylvania.