Whether your roof is covered with shingles, shakes, tile, slate, or metal, be sure it's protected with SURROUND VR Underlayment. A smart alternative to felt, it is water's toughest opponent, creating a secondary water barrier that reduces the incidence of leaks caused by storm damage, wind-driven rain, ice dams, and worn roofing materials. It is a waterproof, synthetic polymer material that will protect your homes against moisture intrusion.