Since 1984, the company has grown the core business of entrances, store fronts and curtain walls through internal expansion and acquisition. Also during this time, other key acquisitions were made to enhance and complement the core business. Naturalite, with a complete line of architectural and commercial skylight products, including smoke venting was acquired, followed by the acquisition of Skywall, a manufacturer of translucent fiberglass wall and skylight systems. Most recently, Moduline Windows was added with a broad line of monumental, architectural-class, high-performance operating window systems.