Peel-and-Stick vs. Felt Underlayment: Florida Roofing Guide

Your roof's shingles or tiles get all the attention, but the layer beneath them may matter just as much — especially in Florida. Underlayment is the water-resistant membrane that sits between your roof deck and your finished roofing material. It's your last line of defense when a shingle blows off in a storm or rain drives up under the edges. Choosing the right type in a state with hurricane-force winds, punishing heat, and a notoriously tough insurance market is not a small decision.

Two options dominate Florida roofing projects right now: traditional felt underlayment (sometimes called tar paper) and self-adhering peel-and-stick underlayment. Each has a legitimate place depending on your roof, your budget, and your goals. Here's what New Smyrna Beach homeowners need to know before their next roof replacement or roof repair.

What Is Felt Underlayment?

Felt underlayment is the old standard — asphalt-saturated paper or fiberglass that is mechanically fastened to the roof deck with roofing nails or staples. It comes in two common weights, typically labeled #15 and #30, with the heavier #30 offering more durability and tear resistance.

Felt has been used on Florida roofs for generations. It's inexpensive, widely available, and familiar to every licensed roofer. When conditions are dry and the finished roofing goes on quickly, felt does its job.

Its downsides show up fast in the Florida climate, though:

• Water absorption: Felt can absorb moisture, which causes it to wrinkle, buckle, and eventually degrade. In Florida's humidity, a delay between deck installation and finished roofing can cause problems before the job is even done.
• Wind vulnerability: Because felt is mechanically fastened rather than bonded to the deck, strong winds can lift and tear it — sometimes before a single shingle is installed.
• UV degradation: Exposed felt breaks down quickly in direct Florida sun. If a storm tears away a section of your finished roofing, a felt underlayment provides little protection until repairs are made.
• Wrinkle and bleed-through: In extreme heat, asphalt in felt can soften and telegraph through lighter-colored finished materials.

What Is Peel-and-Stick Underlayment?

Self-adhering (peel-and-stick) underlayment is a polymer-modified bitumen membrane with an adhesive backing. Once the release film is peeled away, it bonds directly to the roof deck, creating a monolithic, waterproof seal. No exposed fasteners means no small holes for water to find.

Premium peel-and-stick products are engineered specifically for hot climates. They typically use a rubberized asphalt or SBS-modified bitumen compound that stays flexible across a wide temperature range — important when Florida roof deck temperatures can exceed 160°F on a summer afternoon.

Key advantages in a Florida context:

• True waterproof barrier: Because the membrane fully adheres to the deck, water cannot migrate laterally under it the way it can under mechanically fastened felt.
• Wind uplift resistance: A bonded membrane is dramatically harder for wind to lift. This matters enormously during hurricane season.
• UV and heat stability: Quality peel-and-stick products are formulated to resist the plasticizer breakdown that causes felt to degrade in heat.
• Secondary water barrier performance: Peel-and-stick products are the gold standard for what Florida's building code calls a "secondary water barrier" — a topic worth understanding in detail.

Florida Building Code and the Secondary Water Barrier Requirement

This is where the rubber truly meets the road. The Florida Building Code (FBC) — one of the strictest in the nation, updated repeatedly after major hurricane events — requires a secondary water barrier on most residential roofing projects. The intent is straightforward: if your primary roofing material is damaged or removed in a storm, the secondary barrier should keep the structure dry long enough for emergency repairs.

Self-adhering peel-and-stick underlayment meets this requirement easily and is explicitly listed as an approved method. Standard #15 felt does not meet the secondary water barrier requirement on its own. Contractors who try to use light felt as the sole underlayment on a new Florida roof replacement are not meeting code — a fact that matters not just for safety, but for insurance claims and home resale.

In practice, many licensed contractors use a hybrid approach: peel-and-stick at the eaves, valleys, and other vulnerable zones where water is most likely to intrude, and a heavier synthetic felt or a second layer of peel-and-stick over the field of the roof. The specific configuration depends on the roofing system, roof pitch, and wind zone. A licensed local roofer will know exactly what the FBC requires for your home's location and configuration.

Cost Difference: Is Peel-and-Stick Worth It?

Peel-and-stick underlayment costs meaningfully more than standard felt — materials alone can run several times higher per square (100 square feet). On a full roof replacement for an average New Smyrna Beach home, the upgrade from felt to a full peel-and-stick system might add several hundred to a couple thousand dollars to the total project cost.

That sounds like a lot until you consider the other side of the ledger:

• Insurance: Florida insurers increasingly look at underlayment type when evaluating wind mitigation credits and policy eligibility. A fully adhered secondary water barrier can reduce your annual premium enough to recoup much of the cost difference within a few years.
• Storm damage claims: If a hurricane strips shingles from a felt roof, interior water damage — to drywall, insulation, flooring, and belongings — can cost tens of thousands of dollars. A peel-and-stick barrier dramatically reduces that exposure.
• Lifespan: A quality peel-and-stick underlayment is typically rated for a longer service life than felt, meaning less likelihood of underlayment failure midway through your roof's lifespan.

For most New Smyrna Beach homeowners replacing a roof, the long-term math favors peel-and-stick, particularly in higher wind zones near the coast.

Which One Is Right for Your Home?

For a minor repair where only a few shingles or a small section is involved, matching the existing felt underlayment may be perfectly appropriate and code-compliant. For a full roof replacement — especially on a home in a wind-borne debris region — a licensed roofer will almost always recommend a self-adhering product to meet the FBC secondary water barrier standard and satisfy your insurance carrier.

If your roof has taken storm damage, the underlayment itself may be compromised even if it isn't immediately obvious. A licensed inspector can evaluate what's beneath your shingles and tell you exactly what you have.

Don't guess at what New Smyrna Beach's wind zone, code requirements, and insurance expectations mean for your specific home. The details matter, and getting them wrong can be expensive. Read more guides on our site to keep learning, or take the next step below.

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Ready to find out what underlayment your roof actually has — and whether it's up to Florida code? Call us and New Smyrna Roof Co will connect you with a licensed local roofer in New Smyrna Beach for a free inspection. There's no obligation, and knowing what's under your shingles could save you a serious headache the next time a storm rolls through.