Owens Corning
ROOFING UNDERLAYMENT

Abstract:

A roofing underlayment that resists water ingress around fasteners that are used to secure the underlayment to a substrate, such as a roof deck, is provided. The roofing underlayment includes a base layer, a coating layer applied to the base layer, and a water-swellable composition. An upper surface of the roofing underlayment may have a water contact angle of at least 120.degree..