CERTAplank™ Reinforced Siding combines the durability and strength of vinyl with the authentic appearance of real wood siding. Lighter and easier to handle than wood, fiber cement or wood composites, it features an extra-thick panel and reinforced foam backer that provides the rigidity you'd expect from a hardboard cladding. CERTAplank™ is virtually maintenance free - requiring no caulking, painting, touch-ups, or costly maintenance that drive up the installation and long-term maintenance costs of competitive products. The tight seams on this flat face, single-course, weather resistant panel give any project a finished look.