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 When you picture your roof, your first thought is probably the shingles – the visible feature that gives your home its aesthetic appeal. However, beneath those brightly colored tiles lies an important and, in many ways, marginalized piece of your roofing system: roofing underlayment. It is something that every homeowner needs to understand, whether you're on your first build or getting ready for a roof replacement. The Central Purpose of Underlayment Envision a pounding rainstorm, wind buffeting your roof. It is here that underlayment comes into play. Its main purpose is to add a layer of moisture protection, serving as a secondary waterproof layer. If water does leak through the first layer of roofing, the underlayment keeps it from reaching the roof deck and, in turn, your attic and house. This is not merely protection against rain; it's also protection against ice dams in colder climates, where snowmelt refreezes and accumulates behind shingles. Types of Roofing Underlaymen...