Valleys, vents, chimneys and skylights are examples of spots where WeatherLock series waterproofing underlayment should be considered. WeatherLock has a split backing for easy application. WeatherLock seals itself around nail holes for dependable, watertight protection. WeatherLock is backed by Owens Corning for a full 5 years. 1 sq. roll 2 sq.
All values are approximate.