Roof Flashing Problems That Cause Leaks in Altamonte Springs Homes

Your shingles may look perfectly fine from the street, yet water is still finding its way inside your home. In many cases, the real culprit isn't the shingles at all — it's the flashing. Flashing is the thin metal barrier that seals every point where your roof meets a vertical surface, a penetration, or a change in direction. When it fails, even a modest rain can send water straight into your attic, walls, or ceilings.

This is especially common in Altamonte Springs, Florida, where the combination of intense UV exposure, hurricane-force wind, and year-round humidity puts flashing under stresses that are far harsher than what most roofing materials were designed for. Understanding where flashing fails — and why — can help you catch a problem before it becomes a costly structural repair.

What Exactly Is Roof Flashing?

Flashing is typically made from galvanized steel, aluminum, or lead-coated copper. It's installed in strips or custom-formed pieces wherever water would otherwise pour directly into a seam. Think of it as the weatherproofing gasket of your roof system. Without it, joints that can't be covered by shingles alone would leak almost immediately.

The most common flashing locations include:

• Chimney flashing — wraps the base of the chimney on all four sides, usually in two layers (base flashing and counter flashing embedded in the mortar)
• Skylight flashing — frames the entire perimeter of a skylight curb, a notoriously tricky spot to seal
• Valley flashing — runs along the V-shaped "valleys" where two roof planes meet and water volume is highest
• Step flashing — a series of interwoven L-shaped pieces that run up the side of a dormer, wall, or addition
• Vent pipe flashing — rubber or metal "boots" that collar every plumbing vent or exhaust pipe poking through the deck

Each of these locations handles concentrated water flow, so even a small failure point quickly becomes a leak.

Why Flashing Fails Before Shingles Do

Homeowners are often surprised to learn their shingles still have years of life left while the flashing is already failing. There are several reasons this happens.

Thermal expansion and contraction. Metal expands in heat and contracts in cold. In Florida, summer roof temperatures can exceed 160°F, and the daily temperature swing between a sun-baked afternoon and a rainy evening is significant. Over years of cycling, the sealant and caulk that holds flashing edges in place cracks, hardens, and pulls away from surfaces.

Rust and corrosion. Galvanized steel flashing — the most common and affordable type — relies on a zinc coating to resist rust. High humidity and salt air (common in coastal areas of Florida) accelerate that coating's breakdown. Once bare steel is exposed, rust spreads quickly, pitting the metal and creating gaps that water easily infiltrates.

Separation from the roof deck or masonry. Chimney and step flashing must be fastened tightly to both the roof deck and the vertical masonry or siding. As a house settles, as mortar erodes, or as wind repeatedly stresses the joint, the flashing can physically pull away from one surface or the other — sometimes just a fraction of an inch, which is more than enough to let water in.

Storm damage. High winds during Florida's hurricane season can lift, bend, or completely dislodge flashing pieces. Hail can dent metal, creating channels that redirect water inward rather than away. Even a fast-moving summer thunderstorm can introduce enough wind-driven rain to exploit a flashing gap that was previously "dry." If your home recently came through a storm, a storm damage inspection should always include a close look at flashing, not just shingles.

Poor original installation. Flashing is labor-intensive and detail-oriented work. When it's rushed or done incorrectly — wrong overlap dimensions, missing step flashing pieces, sealant used as a substitute for properly embedded counter flashing — problems show up within just a few years, sometimes sooner.

How You Can Spot Flashing Problems

You don't need to climb on your roof to notice the warning signs:

• Water stains on ceilings near a chimney, skylight, or exterior wall
• Peeling paint or damp drywall on interior walls that share a plane with a roof slope
• Visible rust streaks running down from a vent pipe or chimney
• Daylight visible around a skylight frame from inside your attic
• Soft or discolored wood in the attic near any roof penetration

Any of these symptoms deserves prompt attention. Water damage is progressive — what starts as a minor stain can become rotted sheathing, mold growth, or damaged insulation within a single rainy season.

How Flashing Is Repaired

The repair approach depends on how far the damage has progressed. Minor sealant separation on vent boots or step flashing can sometimes be addressed by cleaning the joint and applying a compatible roofing sealant. However, rusted-through flashing, fully separated chimney counter flashing, or failed valley metal requires removal and replacement of the affected sections. A licensed roofer will pull back the adjacent shingles, remove the old flashing, inspect the underlying deck for rot or water damage, and install new flashing before re-laying the shingles.

For a roof repair limited to flashing, the job is usually faster and less expensive than a full replacement — but only if the underlying deck hasn't been compromised by long-term moisture exposure. Speed matters.

Don't Ignore a Suspected Flashing Leak

If you've noticed any of the warning signs above, the smartest next step is a professional inspection before the next big storm rolls through. A free inspection by a licensed local roofer will identify exactly which flashing components are failing and whether any deck damage has already occurred.

Rune Roofing can connect you with a vetted, licensed local roofer in Altamonte Springs who knows the specific demands Florida's climate places on flashing systems. Call us today and let us match you with a local pro — the inspection is free, and the peace of mind is worth every minute.