This premium decorative stone is manufactured using a proprietary curing and drying process and features special additives to help protect against freeze/thaw damage. With near-perfect 90-degree corners, minimal overpours, and well-defined mortar grooves, CanyonRock offers a lifetime limited warranty and a comprehensive business-building program for certified installers. The product is easy to install and includes a complementary color tint embedded in the stone that helps minimize the appearance of nicks or chips. GAF Materials Corp. 973-628-3000.