Skylight Repair in Suffolk County, NY
Usually It’s the Flashing, Not the Skylight
Skylights get blamed for a lot of leaks they did not cause. The unit itself is a sealed, manufactured product with a long service life. What fails is almost always the interface: the flashing kit where the skylight meets the roof, or the curb it sits on. That distinction is the difference between a repair and a replacement, and it is worth establishing before anyone quotes you either.
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Skylight Leak or Condensation
The Question to Answer First
A large share of “leaking” skylights are not leaking from rain at all.
A skylight is a cold surface in the middle of a warm ceiling. Warm interior air carrying moisture from cooking, showers, and daily living hits that cold glass and condenses, exactly like moisture on a cold window. The water then runs down the pane and drips off the frame onto the ceiling below, which looks identical to a roof leak from inside the room.
Ways to tell them apart:
Weather: condensation happens on cold days regardless of rain, and is often worst on clear, freezing mornings. A leak tracks active rainfall.
Location: condensation appears evenly around the frame, usually along the bottom edge. A leak originates from a specific point, often the top or an upper corner.
Season: if moisture appears only in January and never during a July thunderstorm, it is condensation.
Volume: condensation produces minor drips and dampness. A real leak during heavy rain runs steadily.
If it is condensation, the solution involves ventilation and humidity control rather than roof work: a bathroom fan that vents outside, balanced attic airflow, or upgrading an old single-pane unit. Quoting a re-flash for a condensation issue fixes nothing, and we diagnose it properly before recommending any work.
Common Skylight Problems
In Order of Likelihood
Flashing kit failure: the step and head flashing surrounding the unit. Frequently, the original flashing was reused during a previous re-roof, or a contractor sealed around the skylight with caulk instead of installing a dedicated flashing kit. Caulk-dependent skylight installations always fail over time.
Curb rot: on curb-mounted units, this is the wooden frame the skylight rests upon. Water slipping past damaged flashing soaks the curb, and by the time moisture shows inside, the curb often requires rebuilding.
Seal failure between glass panes: fogging or haze between the glass layers, sometimes with visible moisture droplets. The factory glazing seal has failed and the insulating gas has escaped. This is not an active roof leak into the home, but it cannot be patched: replacing the glass unit or the entire skylight is the only fix.
Cracked or broken glass: falling tree branches, hail impact, or thermal stress. Certain units allow glass replacement alone; others require replacing the full frame.
Operating hardware: on venting skylights, this includes manual cranks, electric motors, rain sensors, and wall controls. These are often repairable: a skylight stuck open is an emergency waiting for the next storm.
Blinds and shades: cellular and blackout blinds, both manual and motorized. These can usually be replaced independently of the skylight itself.
Old acrylic domes: bubble skylights from earlier decades yellow, craze, and turn brittle. Repair options for aged plastic domes are limited.
Skylight Flashing and Roof Replacement
The Detail That Causes Years of Trouble
Here is a pattern we see across Suffolk County: a homeowner gets a new roof, everything looks fine, and eighteen months later the skylight starts leaking.
This happens when a roofer shingles around the skylight rather than resetting it properly: new shingles are laid right up to the existing skylight while leaving the old flashing in place with a bead of sealant along the seam. It is faster, cheaper, and looks clean on completion day, but the sealant fails within a few seasons.
Proper installation requires stripping and re-flashing the unit with a manufacturer-approved kit during the roofing project. Doing it right costs slightly more upfront, but it prevents the skylight from becoming an ongoing problem.
If your skylight began leaking after a recent roof replacement, this is likely the root cause, and it is fully repairable.
Can a leaking skylight be repaired, or does it need replacing?
Flashing and curb problems are straightforward repairs. Seal failure between the panes and cracked glass on an older unit generally require replacement. We will identify which issue you have before quoting any work.
My skylight is foggy between the glass. Can that be fixed?
Not with a spot repair. Once the seal fails, the unit’s insulating performance is gone and the glass must be replaced.
Can you fix a skylight that won’t close?
Usually, yes. Motorized units have controllers, drive motors, and rain sensors that can each fail independently and are often available as replacement parts.
How long do skylights last?
Modern glass units typically last 20 to 30 years. The flashing around them tends to need attention sooner, particularly if it was disturbed or improperly sealed during a past roof replacement.
Tell Us When It Happens
Noting whether the moisture appears during heavy rain or simply on freezing mornings tells us most of what we need to know before we arrive on site.