You paid to have the leak fixed. The ceiling dried out, the stain got painted over, and life moved on. Then a hard rain came through and there it was again, in the same corner of the same room.
If that sounds familiar, you’re not alone. A leak that comes back after a “repair” is one of the most common complaints we hear around Rockford and Roscoe, and most of the time the shingles were never the real problem. The flashing was.
What flashing is and why it matters
Shingles shed water across the open field of a roof. They do a poor job anywhere the roof meets something else: a chimney, a skylight, a wall, a plumbing vent, or another roof plane. Those joints are sealed with flashing, which is thin metal (and, at plumbing vents, a rubber boot) that steers water back onto the shingles instead of into the house.
When a roofer replaces a few shingles near a leak but leaves the old flashing alone, the leak often comes right back. The new shingles look great from the yard. The water is still getting in underneath them.
The usual suspects
These are the spots we check first on a repeat leak:
- Chimneys. A chimney needs step flashing along the sides, counterflashing set into the mortar joints, and a properly built back side so water and snow don’t pile up behind it. A bead of caulk smeared along the brick is not flashing, and it usually gives out within a season or two of freezing and thawing.
- Skylights. Skylights need their own flashing kit installed in the right order with the shingles. When a roof is replaced and the old skylight flashing is reused or patched with sealant, leaks around the curb are common.
- Sidewalls and dormers. Where a roof runs up against a wall, each course of shingles should have its own piece of step flashing. Missing or rusted step flashing lets water run behind the siding and down the wall framing.
- Plumbing vent boots. The rubber collars around vent pipes crack and split as they age. It’s a small part, but it’s behind a lot of drips in bathrooms and hallways.
- Valleys. Where two roof slopes meet, a lot of water moves through a narrow channel. Worn, poorly cut or debris-packed valleys can push water sideways under the shingles.
Why the stain isn’t where the leak is
Here’s what makes flashing leaks so frustrating: water rarely drips straight down. It hits the roof deck, then runs along rafters, sheathing seams or the top of a wall until it finds a low spot. A failed chimney flashing can show up as a stain six feet away, near an inside wall. A skylight leak can show up in a hallway.
That’s why “fix the shingles above the stain” so often misses. The real work is tracing the water back to where it enters.
How to narrow it down yourself
You don’t need to get on the roof to help find a repeat leak. In fact, please don’t, especially once frost season starts. Here’s what helps:
- Note when it leaks. Only in heavy rain? Only with wind from one direction? Only when snow is melting? Each pattern points to different spots. A leak that only shows up during a thaw may be an ice dam, not flashing.
- Look in the attic after a rain. With a flashlight, check around the chimney, vent pipes and any skylight shafts. Dark staining, wet wood or rusty nail tips near those spots are strong clues.
- Check from the ground. From the yard, look at the chimney and any walls the roof meets. Missing metal, heavy caulk, or shingles that look newer in just one patch can all tell a story.
- Keep your old paperwork. If you know what the last repair included (or didn’t), it saves time.
What a real flashing repair looks like
A lasting fix usually means opening up the area, not just sealing over it. That can include lifting or removing the shingles around the problem, replacing step flashing piece by piece, installing new counterflashing at the chimney, putting in a new vent boot, and laying ice and water protection where it belongs before the shingles go back down.
It takes more care than a quick patch, but it’s the difference between a repair that holds and one you pay for twice.
Before any roofer starts, ask them to explain exactly which flashing they plan to replace, and ask for close-up photos of that flashing before and after the work. A contractor who does the job right shouldn’t mind showing you.
When it’s time to stop patching
If you’ve had several leaks in different spots, the flashing is all original to the house, or the shingles are curling and losing granules, more patches may not be the best use of your money. A full replacement lets every piece of flashing be done new at once. Our roof repair team will tell you honestly which way makes sense for your home.
If water is coming in right now, start with our guide on what to do if your roof suddenly starts leaking, then give us a call. We’re open 24/7, and tarping is available within 24 hours when a leak can’t wait.
Get the leak found, not just covered
Martin Exteriors has been fixing roofs across the Stateline since 2006, and we’re a GAF Master Elite contractor, a status fewer than 2% of roofing contractors earn. A roof inspection is the fastest way to stop guessing.
Schedule your free roof inspection or call (815) 624-6278. We’ll trace the water, show you where it’s getting in, and explain your options in plain English.
Frequently Asked Questions
Why does my roof still leak after it was repaired?
Often the shingles were replaced but the flashing underneath was not. Flashing seals the joints at chimneys, skylights, walls and vent pipes, and if it is worn or was reused, water keeps getting in even under brand new shingles.
Can caulk or roofing sealant fix a flashing leak?
Only as a short-term patch. Sealant breaks down with sun and freeze-thaw cycles, so a lasting repair replaces the flashing itself, such as new step flashing, counterflashing or a new vent boot.
Why is the water stain nowhere near the leak?
Water usually runs along rafters, roof sheathing or the top of a wall before it drips. A chimney or skylight leak can show up several feet away, which is why the leak has to be traced back to where it enters.
Should I repair the flashing or replace the whole roof?
If the roof is otherwise in good shape, a proper flashing repair is usually the right call. If you have leaks in several places and the shingles are worn out, a replacement lets all the flashing be done new at once. A free inspection will show which makes more sense.
