Roof Sarking & Peel-and-Stick Underlayment: A Florida Guide

Most homeowners think about shingles or tiles when they picture their roof. But the layer that often makes the biggest difference during a Florida hurricane isn't the outer surface — it's the hidden membrane underneath. That layer is called the underlayment (sometimes referred to as "roof sarking" in builder circles), and in recent years self-adhering peel-and-stick products have become the gold standard for homes across Florida.

If you're replacing your roof, filing an insurance claim after storm damage, or just trying to understand what you're paying for, knowing the difference between old-school felt and modern peel-and-stick underlayment could save you a great deal of heartache — and money.

What Is Roof Underlayment (Sarking)?

Roof underlayment is a water-resistant or waterproof barrier installed directly on the roof deck — the plywood or OSB sheathing — before any shingles, tiles, or metal panels go on top. Its job is simple but critical: if water ever gets past the outer roofing material, the underlayment is your second line of defense against leaks reaching your ceilings, insulation, and framing.

The term "sarking" comes from Australian and British building trades and refers to the same concept. You'll occasionally hear Florida contractors and building inspectors use it, especially for membrane-style products. For our purposes, sarking and underlayment mean the same thing.

Traditional Felt Underlayment: The Old Standard

For decades, the industry default was asphalt-saturated felt paper, sold in 15-lb and 30-lb weights. Felt is relatively inexpensive and easy to install, and it did an adequate job in mild climates. In Florida, however, it has serious limitations:

• Heat degradation. Florida attic temperatures routinely exceed 150°F in summer. Felt dries out, becomes brittle, and can crack over just a few seasons.
• Moisture absorption. Felt is water-resistant, not waterproof. In a prolonged rain event — think a multi-day hurricane stall — felt can absorb moisture, wrinkle, and lose much of its protective value.
• Wind-driven rain vulnerability. During a major storm, rain doesn't fall straight down. It blows nearly horizontal at 100+ mph, finding its way under laps and around fasteners. Mechanical fasteners holding felt in place create penetration points that water can exploit.
• Tear-off exposure window. When a crew tears off old shingles, the deck is exposed. Felt must be re-covered quickly, and it can be blown off if an unexpected rain hits mid-job.

These drawbacks pushed Florida's building code authorities toward stricter requirements — and toward a better product.

What Is Peel-and-Stick Underlayment?

Self-adhering underlayment, commonly called peel-and-stick, is a rubberized asphalt membrane with a factory-applied adhesive backing. Installers peel away a release liner and press the membrane directly onto the clean, dry roof deck. The adhesive bonds tightly to the wood, sealing around nail and staple penetrations as it cures.

Key properties that matter in Florida:

• True waterproofing, not just water resistance. The rubberized asphalt matrix is impermeable. Water cannot soak through it the way it can through felt.
• Self-sealing around fasteners. When a roofing nail or staple penetrates the membrane, the rubberized material flows around the fastener and seals the hole. This dramatically reduces leak pathways.
• High-temperature stability. Quality peel-and-stick products are rated for continuous service well above the temperatures your roof deck will ever see, even in a south Florida summer.
• Wind uplift resistance. Because the membrane is bonded to the deck rather than simply mechanically fastened, it resists the negative pressure (suction) that hurricanes create on roof surfaces.
• Extended exposure window. Many peel-and-stick products are rated for 90 to 180 days of UV exposure without a top layer, giving crews flexibility and protecting the deck if a job is interrupted by weather.

Florida Building Codes and Peel-and-Stick

Florida operates under one of the most stringent residential building codes in the country, largely because of lessons learned from Hurricane Andrew in 1992 and the active storm seasons that followed. The Florida Building Code (FBC) now requires self-adhering underlayment — or an approved equivalent — over the entire roof deck in many situations, including:

• New construction and full roof replacements in High-Velocity Hurricane Zones (HVHZ), which includes Miami-Dade and Broward counties
• Tile roof systems statewide, where the underlayment bears the full waterproofing load because tile itself is a "water-shedding" rather than "waterproof" material
• Certain re-roofing permits in coastal counties outside the HVHZ

Even in areas where felt is still technically permitted for some applications, many licensed contractors and insurance carriers now prefer or require peel-and-stick because of its superior performance record. If you're in Lakeland and you're getting bids on a roof replacement, it's worth asking every contractor exactly which underlayment product they plan to install and whether it meets or exceeds current FBC requirements.

How It Prevents Leaks During Hurricane-Driven Rain

The scenario that exposes underlayment weakness isn't a light afternoon shower — it's a slow-moving tropical system dumping fifteen inches of rain over thirty-six hours while wind drives water sideways at eighty miles per hour. In that situation:

• Shingles can lift or lose granules, allowing water to reach the deck
• Tile can crack or dislodge from debris impact
• Metal panel seams can be overwhelmed by sheer volume

When any of those outer failures occur, peel-and-stick underlayment acts as a true secondary roof. Because it's bonded to the deck and self-sealed around every fastener, water has almost nowhere to go. Felt, by contrast, may already be saturated or torn before the worst of the storm even arrives.

For homeowners in Lakeland who are navigating storm damage claims, the condition and type of underlayment is often the deciding factor in whether interior damage occurred — and whether an insurer considers the roof "properly constructed" under the policy terms.

What to Ask Your Contractor

Before signing any roofing contract, ask these questions:

• What underlayment product are you using, and what is its ASTM rating? Look for ASTM D1970 for self-adhering membranes.
• Will peel-and-stick be used on the full deck or only at the eaves and valleys? Full-deck coverage is always better.
• Does your installation method meet or exceed the current Florida Building Code? Ask to see the permit and notice of commencement.
• Are you licensed and insured in Florida? Never let an unlicensed crew on your roof — it can void your insurance coverage.

A free inspection is the best first step to understanding what's currently protecting your home and whether it meets today's standards. You can also read more guides on Florida-specific roofing topics to get up to speed before you start collecting bids.

The Bottom Line

Peel-and-stick underlayment isn't a luxury upgrade — in Florida's climate, it's genuinely the appropriate baseline for any new or replacement roof. It outperforms traditional felt in heat, moisture, wind uplift, and self-sealing capability, and it aligns with where Florida building code is heading. When your outer roofing layer takes a hit in a storm, this membrane is what stands between you and a ruined living room ceiling.

If you're not sure what's under your shingles right now, that's worth finding out before hurricane season reminds you the hard way.

Ready to get a clearer picture of your roof's condition? Call us and Lakeland Roof Co will connect you with a vetted, licensed local roofer in Lakeland who can perform a free inspection and walk you through exactly what's protecting your home — and what, if anything, needs to change.