Skylight Leaks in Altamonte Springs: Repair or Replace?

A skylight is one of the nicest features a home can have — natural light pouring into a hallway, kitchen, or living room without the electric bill. But in Altamonte Springs, Florida, that same opening in your roof is exposed to brutal UV radiation, daily heat cycles, hurricane-force winds, and torrential summer downpours. When a skylight starts to leak, even a slow drip can quietly rot the surrounding decking, damage ceiling drywall, and invite mold into your attic before you ever notice a stain. Acting quickly — and understanding *why* it's leaking — makes the difference between a straightforward fix and a costly structural repair.

The good news is that most skylight leaks follow a predictable pattern. Once a licensed roofer diagnoses the exact cause, you'll have a clear choice: repair it, or use the opportunity to replace it altogether. Here's what you need to know.

Why Skylights Leak: The Three Main Culprits

1. Failed or Deteriorated Flashing

Flashing is the sheet-metal system that seals the gap between the skylight frame and the surrounding roofing material. It's arguably the most leak-prone spot on any roof because it sits at the intersection of two different materials that expand and contract at different rates. In Florida's heat, daytime temperatures on a dark roof surface can exceed 160°F, causing metal flashing to expand, shift, and eventually separate from the sealant that holds it tight. Once that seal breaks, every rainstorm is an invitation for water to travel straight down into your ceiling.

Improper original installation is also a common culprit — flashing that wasn't step-flashed or counter-flashed correctly will fail long before its time.

2. Cracked or Cloudy Domes and Glazing

Older skylights — particularly the bubble-style acrylic or polycarbonate domes common on Florida homes built before the early 2000s — take a beating from UV exposure. Over time, the dome becomes brittle, develops hairline cracks, or crazes (a network of tiny surface fractures that looks like a frosted finish). What starts as a cosmetic issue can quickly become a structural one: cracked domes allow water in during rain and accelerate heat gain inside the home.

Modern tempered or laminated glass skylights handle UV and impact far better, which is one reason a replacement often makes more long-term sense than patching an aged acrylic unit.

3. Dried-Out Sealant and Gaskets

Every skylight has an interior gasket and exterior sealant bead that acts as the last line of defense against moisture. Florida's heat ages these materials faster than almost anywhere else in the country. Caulk shrinks, cracks, and pulls away from the frame. Rubber gaskets harden and lose their compression seal. When this happens, even a modest rain can work water into the gap and send it trickling down to your ceiling — sometimes pooling several feet away from the skylight itself, making the source surprisingly difficult to identify without a trained eye.

Repair vs. Replace: How to Decide

Not every leaking skylight needs to be replaced. A licensed roofer will evaluate:

• Age of the unit. Skylights typically have a service life of 15–25 years. If yours is approaching or past that range, replacement almost always offers a better return on investment than repeated repairs.
• Condition of the surrounding decking. If water has been infiltrating long enough to rot the plywood underneath, the repair scope expands considerably — and replacement becomes a natural part of that work.
• Type of failure. Fresh flashing that simply needs re-sealing is a legitimate repair candidate. A cracked dome or a unit whose frame has warped or separated is not.
• Energy performance. Older single-pane or acrylic skylights can be significant heat-gain sources — a real concern during Altamonte Springs's long, hot summers. A modern low-E glass unit with an insulated frame can meaningfully reduce your cooling load.

The Smart Time to Replace a Skylight: During a Re-Roof

If your home is already due for a roof replacement, replacing the skylight at the same time is almost always the right move. The roofing crew is already removing and relaying the surrounding shingles, which dramatically reduces the additional labor cost. Installing a new skylight into an aging roof, or putting a fresh roof over an aging skylight, creates a mismatch in lifespans that tends to cause problems within a few years.

If you've had storm damage to your roof, it's also worth having a licensed roofer assess the skylight as part of that inspection — wind uplift and hail can damage flashing and glazing in ways that aren't obvious from the ground.

Don't Wait on a Skylight Leak

Water damage compounds fast. A small drip today can mean rotted rafters and mold remediation costs within a single rainy season. The moment you notice water staining near a skylight — or even unexplained dampness in that area — it's time to get professional eyes on it.

Rune Roofing can connect you with a licensed local roofer in Altamonte Springs for a free inspection. Call us today and we'll match you with a qualified contractor who can diagnose the problem and walk you through your repair or replacement options — no pressure, just honest answers.