Roofing underlayment is a protective barrier that sits between your roof decking (the plywood base) and the shingles or metal panels on top. It acts as a second line of defense against moisture, especially during extreme weather or if shingles get damaged.
Types of Roofing Underlayment
- Asphalt-Saturated Felt (Tar Paper) - Traditional black felt that offers water resistance at a low cost.
- Synthetic Underlayment - Lightweight, stronger than felt, and more resistant to tearing and UV exposure.
- Rubberized Asphalt (Peel-and-Stick) - Self-adhering and waterproof, often used in vulnerable areas like valleys or edges.
Why Underlayment Matters
- Moisture protection - It helps prevent leaks if water gets past your shingles.
- Extra insulation - Adds a slight thermal and sound barrier to your roof system.
- Wind-driven rain defense - Protects against storms that force water under roofing materials.
- Required by code - In many regions, underlayment is legally required by building code.
Do All Roofs Need Underlayment?
Yes-whether you have shingles, metal, or tile roofing, underlayment is a best practice. In fact, skipping underlayment could void your roof's warranty or lead to expensive repairs later. Even for re-roofs, roofers will often recommend replacing the old underlayment to ensure long-term protection.
What Do Roofers Recommend?
Most professional roofers recommend synthetic underlayment for its durability and performance. It's lightweight, easier to install, and less likely to wrinkle or absorb moisture than old-fashioned felt.
Make Sure You Get the Right Protection
Roof underlayment may not be visible when the job's done-but it plays a major role in keeping your home dry and protected. Be sure your roofer includes it in your quote, and ask what material they'll be using.
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