Armstrong World Industries, Inc. engages in the design, manufacture, and trade of commercial and residential ceiling, wall, and suspension system solutions. The company is headquartered in Lancaster, Pennsylvania and currently employs 3,700 full-time employees. The company went IPO on 2006-10-11. The company also manufactures ceiling suspension system (grid) products. Its segments include Mineral Fiber and Architectural Specialties. The Mineral Fiber segment produces suspended mineral fiber and soft fiber ceiling systems. Its mineral fiber products offer various performance attributes, such as acoustical control, rated fire protection, and energy efficiency. The Architectural Specialties segment produces, designs and sources ceilings, walls and other interior and exterior architectural applications for use in commercial settings. Its products are available in metal, felt, wood, resin, wood fiber and glass-reinforced-gypsum in various colors, shapes and designs. The company sells standard, premium and customized products. This segment of products is sold primarily to resale distributors and direct customers.