Provide a sloped sill for water run-off and a traditional look to finish off a wainscot or other sill applications. In Original Package Additional Details ------------------------------ Warranty: 20 Year Limited Warranty. NextStone products come with a 20 year warranty against blistering, peeling, corrosion, rust, rot, delamination, flaking or excessive fading. Once NextStone products have been correctly installed they are waterproof and durable; we are confident in the quality of our product and offer a 20 Year Limited Warranty.