Your roofing system must include protection from wind-driven rain. This is accomplished by installing Ice & Water Barrier directly beneath the shingles. Owens Corning offers WeatherLock® Self-Sealing Ice & Water Barrier Products and our Fiberglas™ Reinforced Felt Underlayment product. All are designed for both new construction and reroofing projects.
Also use WeatherLock® Self-Sealing Ice & Water Barrier Products on areas of the roof where water has a tendency to collect or flow. These areas include valleys, vents, chimneys and skylights. It's important to prevent water collection on a roof because that can cause an ice dam to form. This ridge of ice causes water to back up and sit on a roof, instead of properly draining off. This water can work its way under the roof covering and flow into the attic—and cause water damage to a home's interior. To find out more about Ice & Water Barrier Products, click on any of the products listed below:
Flexible, high performance self-sealing ice & water barrier for superior roof deck protection.
Mat-faced surface waterproofing underlayment that is slip resistant, no scuff and lightweight. Provides superior roof deck protection.
Granulated surface self-sealing ice & water barrier for superior roof deck protection.
Dual-layer granulated composition designed for cold weather adhesion and flexibility.
High-temperature waterproofing barrier approved for use under all metal roof systems, including copper and zinc.
What Causes Ice Dams?
Source: University of Minnesota Extension