When most homeowners think about their roof, shingles get all the attention while an equally important layer stays hidden beneath the surface. Roof underlayment acts as a critical second line of defense against water, protecting the roof deck even if shingles are damaged or compromised. Homeowners in Westfield often learn about this layer after talking with a team that explains every component of
Underlayment sits directly on top of the roof deck, beneath the shingles, where it quietly does the heavy lifting of keeping water out. While shingles handle the majority of weather exposure, underlayment serves as the backup protection that becomes critical when wind, ice, or damaged shingles allow water to reach the roof surface.
Underlayment comes in several different types, each offering different levels of protection and durability. Understanding what each option provides helps homeowners make informed decisions when discussing materials with a contractor.
Felt underlayment, often called tar paper, has been used in roofing for decades and remains a common, budget-friendly option. It is made by saturating paper fibers with asphalt to create a water-resistant barrier. Available in different weights, with heavier options offering more durability More prone to tearing during installation compared to newer materials Generally the most affordable underlayment option available
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