Grand Slate™ premium designer shingles from GAF Materials Corp. have massive, extra-thick tabs and a specially blended color palette that create the look of real slate shingles. At approximately 425 pounds per square, they are 60 percent thicker than each layer of other "premium" fiberglass shingles and are warranted to withstand winds up to 110 mph. The unique 17- by 40-inch size and larger 7.5-inch exposure reduce installation time and cost. Grand Slate™ shingles come with a limited lifetime warranty on both residential and commercial applications. For more information, visit