Deck Defense High Performance Roof Underlayment from Owens Corning shields a house from interior damage during roof installation. Able to withstand extreme weather conditions, it protects a roof deck for up to six months. Its light gray color reduces the temperature of an exposed roof, and it is able to provide a secondary water-shedding barrier once shingles are installed. Its bottom surface coating and durable construction decrease the chance of leak-causing tears.