Westlake Royal Building Products™ USA Inc., a Westlake company (NYSE:WLK), is a leader throughout North America in the innovation, design and production of a broad and diverse range of exterior and interior building products, including siding and accessories, trim and mouldings, roofing, stone, windows and outdoor living. Westlake Royal Building Products manufactures high quality, low maintenance products to meet the specifications and needs of building professionals, homeowners, architects, engineers and distributors, while providing stunning curb appeal with an unmatched array of colors, styles and accessories.