Skylight Leaking? Here’s What to Do (DFW Homeowner Guide)

A leaking skylight is one of the most misdiagnosed problems in residential roofing. Most homeowners — and many contractors — assume a wet ceiling under a skylight means the skylight glass or frame has failed. Usually it hasn’t. The majority of skylight leaks in DFW homes come from failed flashing or a compromised curb seal — both of which are repairable without replacing the entire unit.

Why Skylights Leak: The Real Causes

Flashing Failure (Most Common)

The metal flashing that seals the gap between the skylight curb and the surrounding roof surface is typically the failure point. In DFW, heat cycling causes flashing to expand and contract, eventually separating from the caulk or mastic that seals it. Skylights installed in the 1980s–1990s — extremely common in DFW’s suburban housing stock — are at high risk for this failure mode.

Curb Seal Deterioration

Framed skylights sit on a wood or aluminum curb. The sealant between the frame and the curb degrades over time, particularly in Texas’s UV-intense environment. Once this seal cracks or separates, water enters on the interior side of the flashing — making it look like the skylight glass is leaking when the entry point is actually at the curb-to-frame junction.

Condensation (Not Actually a Leak)

In DFW’s shoulder seasons — when interior humidity is high and exterior temperatures drop at night — condensation forms on skylight glass and runs down the interior frame, appearing identical to a leak. If your “leak” only appears in the morning after cool nights and stops when the day warms up, condensation is the likely culprit. This requires improving ventilation or interior humidity control, not a roofing repair.

Actual Skylight Frame or Glass Failure

This does happen, but it’s less common than flashing or seal issues. Frame separation, cracked dome lenses (on older acrylic skylights), or failed gaskets can allow direct water entry. Acrylic dome skylights — common in 1980s–1990s Texas construction — are particularly prone to UV cracking after 20+ years.

How We Diagnose a DFW Skylight Leak

Our skylight leak repair process starts with identifying the exact entry point — not just the wet spot on your ceiling. We inspect:

• Step flashing and counter-flashing around the entire perimeter
• The curb-to-frame seal on all four sides
• The condition of the glass or dome for cracks or gasket failure
• The condition of the surrounding shingles and underlayment
• The interior ceiling for evidence of the water’s travel path (which often runs several feet from the actual entry point)

We use water testing when the source isn’t immediately obvious — targeted hose testing at specific locations while an assistant monitors the interior.

Repair Options and Costs

We recommend against caulk-only repairs on skylights older than 15 years — they buy time but not much of it. A proper flashing replacement is the right fix for most DFW skylights of that age.

When to Replace vs. Repair

Replace the entire skylight when:

• The acrylic dome or glass is cracked or severely crazed from UV exposure
• The frame has separated or is structurally compromised
• The unit is over 25–30 years old and has never been resealed
• You’re already replacing the roof — this is the ideal time to address the skylight properly

Repair the flashing and seals when:

• The glass/dome is structurally intact
• The frame is solid and square
• The skylight is less than 20 years old

Skylight Leaks and Your Roof System

A leaking skylight that’s been ignored for even one season can cause significant surrounding damage — wet insulation, mold in the ceiling cavity, rotted decking around the curb. When we repair a skylight, we always inspect the surrounding roof for leak damage as part of the assessment, because the skylight is rarely the only area affected. We also serve homeowners across Dallas and the greater DFW region.

Frequently Asked Questions

How can I tell if my skylight is leaking or if it’s condensation?

Condensation typically appears on the glass surface and interior frame during temperature-humidity transitions. A leak usually appears at the ceiling below the skylight during or after rain events. Test: cover the exterior of the skylight with plastic during dry weather and wait for rain — if the interior stays dry, the water is coming through the glass area, not the flashing.

Can you repair a skylight without removing shingles?

A caulk reseal can be done without removing shingles. A proper flashing replacement requires removing the surrounding shingles and reinstalling them — it’s the only way to get a durable repair.

Get a Free Estimate from Net Roofing LLC — Call (817) 523-9373 or visit our contact page. We diagnose and repair skylight leaks throughout DFW — and we tell you honestly whether a repair or replacement is the right call.