Roofing underlayment serves as a critical secondary barrier between the roof deck and the final shingles or tiles. Its main purpose is to provide a waterproof or water-resistant layer that prevents moisture from reaching the wooden deck, which could otherwise lead to rot or structural failure. In regions with heavy rainfall or snow, this layer is indispensable because it acts as a safeguard against wind-driven rain and ice dams. By sealing the roof surface before the primary material is installed, it ensures the building remains dry throughout the installation process and for decades afterward.
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