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Synthetic Underlayment vs Tar Paper: Why Modern Roofs Deserve Better When you strip a roof, one of the most important components you never see is the underlayment. For decades, that meant asphalt‑saturated felt—“tar paper.” Today, synthetic underlayment has largely replaced it on quality installs, and there are clear reasons why. First, synthetic underlayment is much stronger and more tear‑resistant. Tar paper rips easily when it gets wet or when installers walk it on a steep