By creating a barrier at the most vulnerable areas of your roof (at the eaves and rakes, in valleys, around chimneys, etc.), WeatherWatch® Leak Barrier will help prevent leaks due to water backing up in your gutters, wind-driven rain, and, in the North, damaging ice dams.  It will also protect your home from expensive wall and ceiling staining from leaks. WeatherWatch® Leak Barrier is a key part of the GAF Lifetime Roofing System and has earned the Good Housekeeping Seal¹ (applicable in the U.S. only).  Eligible for a Lifetime limited warranty when used on Lifetime Shingle Roofs and eligible for a 25-year ltd. warranty when used on non-Lifetime Shingle roofs.²