WinterShield is a synthetic underlayment that is water-resistant and helps prevent ice damming underneath the shingles in winter and colder climates. WinterShield is composed of a rubberized asphalt that will protect against unwanted leaks. A self sealing membrane seals nail holes and punctures.
Leak barriers are placed not only along the eaves, but also in valley, at rakes, and around chimneys. These are the areas of a roof that are most susceptible to leak development. This type of moisture protection device can be used on a roof constructed of either shingle or metal.