Belmont Impact Resistant (IR) shingles reflect the same high manufacturing standards and superior protection as the rest of CertainTeed's line of roofing products. Belmont IR Shingles are built on the industry's toughest fiber glass mat base, and have an added durable reinforcement on its underside to achieve the highest impact resistance. Belmont IR shingles are asphalt shingles designed to look like natural slate, composed of a base shingle with random tabs on the top, giving an authentic, natural look with true depth and dimension. It is most aesthetically appealing when used on slopes of 9" per foot or greater. When applied with underlayment, Belmont IR produces at least two layers of roof protection and the quality is reminiscent of handcrafted workmanship. It is designed to resist blow off in high wind conditions utilizing two rows of technologically advanced sealant on the back-side of the shingle. Belmont IR shingles are algae (commonly called fungus) resistant and help protect against dark or black discoloration, sometimes called staining or streaking, caused by blue-green algae.