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Westlake Royal Building Products™ 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.