Peel-and-Stick vs. Felt Underlayment: What Florida Homeowners Need to Know

When a licensed roofer pulls off your old shingles or tile, one of the first things they lay down is underlayment — the layer that sits between your roof deck and the finished roofing material. Most homeowners never think about it, but in Florida, that choice matters more than almost anywhere else in the country. Heat, humidity, hurricane-force winds, and one of the toughest building codes in the nation all push Florida underlayment decisions in a very specific direction.

The two main options your contractor will talk about are self-adhering peel-and-stick underlayment and traditional asphalt-saturated felt. Each has a real place in roofing, but they perform very differently in the Florida climate. Here's an honest breakdown so you can have an informed conversation with the roofer who shows up at your door.

What Is Felt Underlayment?

Felt underlayment — often called "tar paper" — has been used on roofs for well over a century. It's made from a base of organic or fiberglass material saturated with asphalt. It comes in two common weights, known as 15-lb and 30-lb, though modern products are actually measured by thickness and performance class rather than literal weight.

What felt does well:

• It's inexpensive and widely available
• It's fast for crews to install on straightforward low-slope or steep-slope applications
• 30-lb (or equivalent ASTM D226 Type II) is accepted under many Florida roofing applications

Where felt falls short in Florida:

• It wrinkles and buckles when it gets wet before shingles are installed, which happens constantly during Florida's unpredictable rain season
• It can tear in high-wind conditions, especially at lap seams and around penetrations
• It is not a self-sealing product — if wind-driven rain works under a shingle or tile, water can still migrate through unsealed nail holes and seams
• In extreme heat, cheaper felt products can dry out, become brittle, and lose their protective qualities over time

What Is Peel-and-Stick Underlayment?

Self-adhering underlayment — commonly called "peel-and-stick" — is a rubberized asphalt or polymer-modified product with a factory-applied adhesive backing. You peel off a release film and press the sheet directly to the roof deck, and it bonds completely. Laps are also adhered, creating a nearly continuous waterproof membrane.

What peel-and-stick does well:

• Creates a self-sealing, watertight layer even around nail penetrations
• Bonds directly to the deck so wind cannot lift or displace it
• Resists moisture infiltration dramatically better than felt during the window between deck exposure and shingle installation
• High-quality products are rated for elevated temperatures — important in a state where attic and roof-deck temperatures routinely exceed 150°F
• Adhered seams dramatically reduce the chance of water intrusion during hurricane conditions

Where peel-and-stick costs more:

• Material cost is meaningfully higher than felt — often two to four times the price per square depending on product grade
• Labor can be slightly more involved, particularly in high heat where the adhesive activates very quickly
• Some products require a primer coat on certain deck materials

Florida Building Code and Hurricane Compliance

This is where the conversation really shifts in favor of peel-and-stick for most Florida homes.

The Florida Building Code (FBC) is among the strictest in the country specifically because of the state's hurricane exposure. The High-Velocity Hurricane Zone (HVHZ) — which covers Miami-Dade and Broward counties — has its own even more demanding requirements, and products used there must carry a Miami-Dade Notice of Acceptance (NOA).

Outside the HVHZ, the FBC still requires underlayment to meet specific wind-resistance standards. For many common steep-slope applications (shingles, tile), the code requires a secondary water barrier — and self-adhering underlayment is one of the most straightforward ways to satisfy that requirement. When you're having a roof replacement done, your contractor should be pulling permits and installing underlayment that meets current FBC standards, not what was accepted ten or fifteen years ago.

In hurricane conditions, the underlayment becomes your last line of defense if the primary roofing material is damaged or lifted. A properly adhered peel-and-stick layer can keep water out of your home long enough to prevent catastrophic interior damage, even after shingles are lost. Felt, with its unglued laps and unsealed nail holes, offers far less protection in that scenario. If your home has experienced storm damage, the condition of your underlayment is one of the first things a licensed inspector will evaluate.

Heat Resistance: A Genuinely Important Factor

Florida roofs bake. Roof deck surface temperatures during summer regularly reach 160–180°F in direct sun. Cheap or improperly specified underlayment can soften, slide, or degrade under those conditions over time.

Premium peel-and-stick products designed for hot climates are engineered to resist thermal softening and remain dimensionally stable at high temperatures. When you're comparing bids, it's worth asking your contractor specifically which underlayment product they're specifying and whether it carries a high-temperature rating. This matters for the roof inspection record and for insurance documentation as well.

Cost Difference: Is It Worth It?

Upgrading from standard felt to a quality peel-and-stick underlayment typically adds a few hundred to over a thousand dollars to a full roof replacement, depending on home size and product selection. In most cases, that cost is modest relative to the total project.

Consider it this way: underlayment is essentially invisible once the job is finished, but it's working every day — against rain, heat, and wind. In a state with an increasingly stressed homeowners' insurance market, having a properly documented, code-compliant, high-performance underlayment can matter at claim time and may factor into your policy. Read more guides on how roofing decisions affect Florida insurance coverage.

For most Altamonte Springs homeowners replacing a roof, peel-and-stick underlayment is the smarter long-term investment. Felt has its place in lower-risk applications and tight budgets, but when Florida's weather is the variable, the secondary water barrier is not the place to cut corners.

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If you're weighing underlayment options or just want an honest assessment of your current roof's condition, call us and Rune Roofing will connect you with a licensed local roofer in Altamonte Springs for a free inspection. There's no pressure — just straightforward answers from a qualified professional who knows Florida code.