Cascade is a unique option for roofs designed in the classic architectural styles. Featuring an unmistakable diamond shape that is recognized by U.S. Patent No. D589, 172 S, Cascade is often specified on historic buildings or on roofs in historic neighborhoods. Cascade features up to a Limited Lifetime Warranty for single family residential structures and a 50 year fully transferable Limited Warranty for all other structures. All four traditional colors are available with the Scotchgard Algae Resistant Roofing System, which warrants that your roof will remain algae resistant for 20 years.