Roofing products including coated facer

Abstract

Roofing underlayments include an asphalt batch layer and a coated facer having a thickness of from about 0.75 mm to about 1.25 mm disposed on the asphalt batch layer. The coated facer comprises an uncoated nonwoven mat comprising a plurality of fibers having a diameter of from about 10 microns to about 13 microns bound together by a binder and a coating on the nonwoven mat. The binder comprises less than about 25 wt. % of a total weight of the nonwoven mat. The roofing underlayment has a Gurley stiffness of less than 15,000 g when measured in accordance with ASTM D6125.

Dependencies are inferred from the claim text.