What are "ice and water shields"?

Ice and water shields are specifically designed as waterproof underlayments used in roofing applications. They provide a crucial defense against leaks caused by melting snow and ice dams, which can accumulate at eaves and in valleys. These underlayments are typically composed of a rubberized asphalt membrane that adheres directly to the roof deck, creating a watertight barrier.

This barrier prevents water from penetrating the roof structure, especially in vulnerable areas where water can pool or where roofing materials meet. By installing ice and water shields, contractors can significantly reduce the risk of water damage, making them an essential component in areas prone to harsh winter weather. Their effectiveness lies in their ability to maintain waterproof integrity during conditions where traditional underlayment might fail.

In contrast, decorative roofing materials are intended for aesthetics rather than function, insulation layers focus on thermal performance rather than water protection, and structural supports pertain to the framework of the roof rather than its ability to prevent water intrusion. Thus, the classification of ice and water shields as waterproof underlayments accurately reflects their role in roofing systems.