What is the purpose of the ice-and-water barrier in roofing?

The primary purpose of the ice-and-water barrier in roofing is to prevent water leakage. This specialized barrier is installed in areas particularly vulnerable to leaks, such as eaves, valleys, and around penetrations like chimneys and vent pipes. It is designed to create a watertight seal that can effectively block moisture from entering the structure, especially during ice dam situations or heavy rainfall. By preventing leaks, the barrier helps to protect both the roof and the underlying structures from potential water damage, mold growth, and deterioration over time. This functionality makes it crucial in roofing applications where water management is a critical concern.

While wind damage, heat insulation, and structural support are important aspects of roofing materials and systems, they are not the primary functions of the ice-and-water barrier.