Why Your Skylight Drips After Every Columbus, IN Rain (and How the Fix Works)
The stain showed up on a Tuesday. A homeowner near Lincoln Park noticed a coffee-colored ring on the drywall right below the kitchen skylight, about the size of a saucer. It only got darker after a hard June rain. She wiped it, watched it, and by the next storm a single slow drip was landing on the counter every twenty seconds or so. Her first thought, like most people’s, was that the skylight itself had failed and she’d need a whole new unit.
She didn’t. The glass was fine. What was leaking was everything around it.
The stain wasn’t where the water got in
This is the part that trips up almost everyone. Water rarely enters a roof directly above the spot where it drips inside. It runs along framing, follows the slope of the deck, and finds the lowest exit point before it shows up on your ceiling. A stain under a skylight tells you where water is landing, not where it’s entering.
When we pulled back the details on this kitchen skylight, the culprit was the flashing at the top edge, the side facing uphill. Skylights sit in the path of everything running down the roof toward them, so the uphill side takes the most water. Over about nine years, the sealant along that head flashing had shrunk and cracked, leaving a hairline gap. During a normal shower it held. During a heavy Columbus downpour, when water sheets down the slope faster than it can drain around the curb, it pushed right through.
If you want to understand why water travels before it appears, we walk through the whole path in tracking down a roof leak in Columbus, IN. Skylights are one of the most common places that path ends.
Ruling out the three things it usually is
When a skylight leaks, it’s almost always one of three things, and they’re worth checking in order because the fix and the cost are very different.
1. Flashing failure. This is the most common by far. The metal and sealant that tie the skylight into the surrounding shingles wear out before the skylight does. On our Lincoln Park job, re-flashing the head and sides ran about $450, and it took a single morning. No new skylight needed.
2. Condensation, not a leak at all. In winter, warm indoor air hits the cold glass and beads up, then drips. It looks exactly like a roof leak but shows up on cold mornings, not during rain. The fix here isn’t roofing at all, it’s ventilation and humidity control. If your attic runs damp, our piece on attic ventilation problems is a better starting point than calling for a repair.
3. A failed skylight seal. Older units can lose the seal between the panes or crack the frame. This is the least common and the most expensive, usually meaning replacement. A mid-range residential skylight plus labor tends to land in the $900 to $1,600 range depending on size and how the interior is finished.
The reason to check in that order is simple: two of the three cheapest possibilities get missed when people assume the glass has failed and jump straight to replacement.
How the flashing repair actually goes
For the common case, flashing, here’s what the work looks like so nothing surprises you.
The crew removes the shingles immediately around the skylight, usually one to two courses up and to the sides. That exposes the old step flashing and head flashing. Those pieces come off, the deck underneath gets checked for soft or rotted wood, and new flashing goes in as a layered system: apron flashing at the bottom, step flashing woven into each shingle course on the sides, and head flashing tucked under the shingles above. Sealant is the last line of defense, not the first, so good flashing overlaps like shingles do and sheds water by shape, not by glue.
On a home off Taylor Road last fall, the crew found the leak had gone unaddressed long enough to soften a small patch of decking, maybe 18 inches square. Replacing that section added about $180 and an hour to the job. That’s the quiet cost of waiting: a $450 flashing fix becomes a $630 flashing-and-decking fix. It’s the same pattern we describe in rotten roof decking, just centered on a skylight instead of a valley.
When a repair makes sense and when it doesn’t
A single skylight with worn flashing on an otherwise healthy roof is a clean repair. Fix the flashing, dry out the ceiling, done.
The decision gets more involved if your roof is near the end of its life. Re-flashing a skylight under 15-year-old shingles that are already curling means you’re spending money on a small patch of a roof that’s going to be replaced soon anyway. In that case it can make more sense to fold the skylight detail into a larger plan. Our fix it now or let it wait guide lays out how to weigh that without overspending in either direction.
If you’re not sure which situation you’re in, that’s exactly what an inspection is for. We look at the skylight, the flashing, the surrounding shingles, and the decking, then tell you plainly whether it’s a targeted repair or something bigger. You can schedule a roof inspection or, if you already know the flashing is the problem, go straight to roof repair.
Frequently Asked Questions
My skylight only leaks during wind-driven rain, never in a calm shower. Is it really the flashing? Often yes. Wind pushes water sideways and uphill, past sealant that holds fine under gravity alone. A leak that only appears in storms with strong wind usually points to a flashing gap on the uphill or windward side rather than a failed pane. It’s the same mechanism behind a lot of storm leaks we cover in wind damage repairs.
The drip only happens on cold mornings, with no rain at all. What’s going on? That’s almost always condensation, not a roof leak. Warm, humid indoor air meets the cold skylight glass and beads up. The fix is better attic ventilation and lower indoor humidity, not new flashing. If you seal the roof and the “leak” keeps coming on dry winter mornings, you’ll know condensation was the real cause.
I had the skylight resealed last year and it’s leaking again already. Did they do it wrong? Possibly, but not always. If someone only ran a bead of caulk over the old flashing instead of replacing the flashing itself, that’s a patch that was always going to be temporary. Proper repair rebuilds the layered flashing so water sheds by overlap. Sealant that’s doing all the work on its own tends to fail within a season or two, which is one of the most common repeat repairs we get called back to fix correctly.