Metal Roofing

GAF StormGuard® High-Temperature Ice & Water Shield for Metal Roofing

Metal roofing systems require an underlayment that can withstand both extreme heat and the unique movement of metal panels. As metal expands and contracts with daily temperature changes, the underlayment beneath it must maintain a strong bond to the roof deck while continuing to provide reliable waterproof protection. GAF StormGuard® High-Temperature Ice & Water Shield is specifically designed to meet these demands.

With a high-temperature rating of up to 260°F (127°C), StormGuard High-Temperature is well suited for use beneath standing seam, exposed-fastener, and other metal roofing systems. Unlike standard self-adhered underlayments that can soften or lose adhesion when exposed to excessive heat, its specialized adhesive is formulated to remain stable under the elevated temperatures commonly generated by metal roof panels.

The membrane creates a watertight seal by bonding directly to the roof deck and self-sealing around nails and fasteners. This helps protect against leaks caused by wind-driven rain, ice dams, and melting snow while providing an additional layer of defense in critical areas such as eaves, valleys, roof-to-wall transitions, chimneys, skylights, and vent penetrations.

StormGuard High-Temperature also serves as an effective secondary water barrier beneath metal panels. If water is driven beneath the roofing during severe weather, the membrane helps prevent moisture from reaching the roof deck, reducing the risk of wood rot, mold growth, and structural damage.

Because metal roofs are designed to last 40 to 70 years or more, selecting a premium underlayment is essential to achieving the full service life of the roofing system. GAF StormGuard High-Temperature Ice & Water Shield delivers the heat resistance, waterproof performance, and long-term durability needed to complement modern metal roofing, making it a trusted choice for contractors and homeowners seeking reliable protection in demanding climates.