Presidential Shake TL, with its sculpted rustic edges, is constructed using three laminated layers of the industry's strongest, most durable materials, making it one of the thickest, toughest and best looking shingles on the market. It has the beauty of a wood shake with less cost and better performance. These algae resistant shingles help protect against staining or discoloration caused by algae. It is designed to resist blow off in high wind conditions up to with normal installation and with special installation.