The PABCO Roofing line of Cascade asphalt shingles is said to be the only diamond-shaped roofing product available today. Cascade shingles come in four colors designed to honor the style and heritage of historic homes. According to the manufacturer, the shingles meet the UL790 Class A Fire Resistance Standard, offer a Limited Lifetime warranty, and feature Algae Defender. pabcoroofing.com