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Skylight Leaks and Seal Failure
in Cincinnati, OH
Skylights are common in Cincinnati homes, especially in mid-century ranch and split-level designs built to bring in more light. The joint between a skylight frame and the surrounding shingles has to handle everything Cincinnati throws at it. That means subzero winter nights, 95-degree July afternoons, heavy rain, and ice. When that joint starts to fail, water can travel along rafters and show up on the ceiling far from the actual leak.
Quick Answer
Skylights in Cincinnati take a beating from summer heat, winter cold, and heavy rain all in the same year. The seal around the frame cracks and lets water in. A roofer reseals the joint or replaces the flashing around it. Call (513) 666-5386 if you spot water stains on the ceiling near your skylight.
Telltale Signs
Warning Signs to Watch For
- Water dripping from the skylight frame or surrounding ceiling during or after rain
- Visible discoloration or water staining on the interior curb or well of the skylight
- Condensation or fogging between double-pane skylight glazing panels
- Paint peeling or drywall bubbling on the ceiling around the skylight perimeter
- Visible cracking or shrinkage of sealant bead around the skylight curb exterior
- Rust or corrosion staining on the skylight frame or surrounding flashing metal
Root Causes
What Causes Skylight Leaks and Seal Failure?
Curb Flashing Separation
Curb flashing is the metal trim that wraps the base of a skylight where it meets the roof. The metal frame and the asphalt shingles expand and contract at different rates through Cincinnati's temperature swings. Over time that movement pulls the flashing loose at the corners and opens gaps where water gets in.
The Fix
Skylight Flashing Replacement
The old curb flashing is removed and the roof deck around the opening is checked for rot. Then a new flashing kit goes in with proper step flashing and flexible rubberized sealant at every corner.
Glazing Seal Failure and Frame Deterioration
The seal between the skylight glass and its frame is a rubber gasket. Cincinnati's summer UV breaks that gasket down, and older skylight units can see significant gasket failure within ten to fifteen years. Once it cracks, water gets between the frame and glass and drips inside, which looks just like a roof leak.
The Fix
Skylight Unit Replacement
A skylight with a failed glazing seal cannot be patched from the outside. The whole unit gets replaced with a modern double-pane skylight and a fresh integrated flashing system.
Ice Backup at Skylight Curb
Cincinnati's freeze-thaw cycles cause water to pool on the uphill side of a skylight and then freeze overnight. That ice wedges under the flashing and forces it loose. When the ice melts, water has a clear path into the roof assembly with no visible gap to find on a dry day.
The Fix
Head Flashing Repair and Ice Guard Installation
The head flashing on the uphill side of the skylight is reset and tied back into the step flashing. Then self-adhering ice-and-water shield goes under the shingles uphill of the skylight to block any ice backup from getting through.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Curb Flashing Separation | Glazing Seal Failure and Frame Deterioration | Ice Backup at Skylight Curb |
|---|---|---|---|
| Leak appears only in winter or during freeze-thaw events, not heavy rain | |||
| Fogging or moisture visible between the two panes of skylight glazing | |||
| Water appears at interior ceiling several feet from skylight during rain | |||
| Sealant visibly cracked and pulling away from exterior skylight curb | |||
| Skylight frame corroded and water drips directly from frame interior face | |||
| Ice visible wedged beneath uphill flashing after a cold snap |
Free Inspection
Get a Diagnosis in Cincinnati
An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
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