Roof Leak Detection
Not sure which penetration is leaking? Our detection process pinpoints it before any repair begins.
Learn moreFlashing & Chimney Leak Repair in Covina, CA
Most roof leaks do not start in the middle of the roof. They start where the roof meets something else. We rebuild and reseal those failure points the right way, so the leak actually stops.
Where leaks really start
Why Penetrations Cause Most Roof Leaks
Flashing is the metal work that seals every place your roof is interrupted: chimneys, plumbing vents, skylights, walls, and valleys. The field of a roof is one continuous waterproof surface, and it rarely fails on its own. But everywhere that surface meets something else, two different materials expand, contract, and move at different rates. Sealants fatigue, metal works loose, and water finds the gap. In our experience as a roofing company in Covina, the majority of residential leaks trace back to one of these transition points rather than to the roofing material itself.
This is good news, because it means most leaks are fixable without touching the rest of the roof. The trick is identifying which penetration is the culprit, which is exactly what our roof leak detection process is designed to do before any repair begins.
The failure points we repair
- Chimney flashing. The classic two-part system: step flashing woven into the shingles or tiles, plus counter flashing embedded in the masonry. When either fails, water runs down the chimney and into the house. Stains near the fireplace almost always point here.
- Pipe boots. The rubber collars around plumbing vent pipes dry out and crack in intense sun. A cracked boot funnels water straight down the pipe, often surfacing as a stain far from the vent.
- Skylight curbs. Skylights sit in a raised curb wrapped in flashing. Failed curb flashing or deteriorated skylight seals let water in around all four sides.
- Valleys. Where two roof slopes meet, water volume is highest. Worn valley metal or underlayment here causes some of the most destructive leaks we see.
- Wall flashing. Where a roof meets a second-story wall or dormer, step flashing and kick-out diverters keep water from running behind the siding. Missing kick-outs are a frequent find on our inspections.
- Dryer and bath exhaust vents. Smaller penetrations, same principle. Their seals fail the same way pipe boots do.
Know the signs
Signs Your Flashing Is Failing
- Water stains near the fireplace or on the ceiling below a chimney
- Rust streaks running down from flashing onto shingles or siding
- Cracked, missing, or peeling sealant visible around vents and skylights
- A stain that appears only in wind driven rain, pointing to a penetration on the windward side
- Daylight visible around a chimney or vent from inside a dark attic
- Damp insulation clustered around a pipe or vent rather than spread across the attic
- Loose or lifted metal you can see from the ground around roof transitions
If any of these sound familiar, the fix is usually straightforward once the right penetration is identified. Call (626) 719-0138 and tell us where the stain is, and we will tell you what it most likely points to.
Done right, not just sealed
Our Flashing Rebuild and Reseal Process
There is a right way to fix flashing and a fast way. We do it the right way.
Diagnose the exact penetration
We confirm which flashing point is actually leaking using attic inspection and, when needed, controlled water testing. We never rebuild flashing on a guess.
Remove surrounding material carefully
Shingles or tiles around the penetration are lifted or removed so we can see the full assembly: step flashing, underlayment condition, and the deck underneath.
Rebuild with proper layering
New step flashing is woven into the roofing courses so each piece sheds water onto the one below, counter flashing is properly seated, and pipe boots are replaced with quality components. Sealant is the backup, never the primary waterproofing.
Restore the roofing around it
Shingles or tiles go back in their original pattern, matched as closely as possible. The repair should shed water exactly like the surrounding roof, because it is built exactly like it.
Verify with water
Where practical, we water test the repair before we leave. You get photos of the finished work and a clear explanation of what was done and why it will hold.
Local conditions
Why Flashing Fails Faster in Covina
Flashing lives a harder life here than in milder climates. Months of intense UV bake sealants until they crack and shrink. Santa Ana winds work at every edge and transition, loosening metal that was perfectly seated a year ago. Then winter rain arrives and exploits every weakened seal at once. It is a one-two punch that makes flashing the most common leak source on Covina roofs, and it is why Covina roofers who skip the flashing check are missing the most likely culprit.
We see the same pattern across West Covina, Glendora, San Dimas, Azusa, and Baldwin Park. Older homes with original flashing are the most vulnerable, but we also fix plenty of flashing on newer roofs where the original installation cut corners: sealant smeared over a gap instead of proper step flashing, or counter flashing that was never embedded in the masonry. Age is not the only cause. Workmanship is the other one.
Benefits of doing it properly
A proper flashing rebuild stops the leak at its source instead of chasing symptoms. It protects the decking and framing around the penetration from rot, which is where the real money goes when flashing leaks are ignored. And because the repair is built into the roofing system rather than smeared on top of it, it lasts as long as the surrounding roof instead of needing redoing every couple of years.
What Affects Flashing Repair Costs
Flashing work is refreshingly straightforward to price once we have seen it, but a few factors move the number:
- Which penetration and how many. A single pipe boot is a small job. A full chimney with step and counter flashing on two sides is a bigger one.
- Reseal vs. rebuild. Resealing intact flashing is quick. Rebuilding failed or incorrectly installed flashing involves removing and reinstalling surrounding roofing.
- Roofing material. Tile work takes more labor than shingle work because tiles must be carefully lifted and reset.
- Access and height. Chimneys on steep or high roofs add time and safety equipment.
- Hidden damage. If the flashing has been leaking for a while, surrounding decking may need repair too. We show you photos before recommending anything extra.
After our inspection you get a written scope with real numbers. No blind phone quotes, no surprises on the invoice.
When to call a professional
Flashing is not a DIY-friendly repair. It requires working at height, lifting roofing without breaking it, and understanding how water shedding layers overlap. A tube of sealant from the hardware store smeared over the problem is the most common reason we get called back to fix a "repair" someone already paid for. If you are searching for roof repair near me because of a leak near a chimney, vent, or skylight, call (626) 719-0138 and get it diagnosed properly the first time.
Service area
Flashing Repair Across Covina
We rebuild flashing and stop penetration leaks throughout:
Related services
Flashing Problems Rarely Travel Alone
These services pair naturally with flashing repair:
Storm & Wind Damage Repair
Wind loves to attack flashing first. If a storm loosened your transitions, we repair the full scope of damage.
Learn moreRoof Installation
When flashing failures are widespread across an aging roof, replacement with all-new flashing is often the smarter investment.
Learn more
Common questions
Flashing & Chimney Repair FAQs
Why do most roof leaks start at flashing?
Every penetration is a place where two materials meet and move differently, which breaks seals over time. The uninterrupted field of the roof rarely fails on its own. Chimneys, vents, skylights, and valleys are where water finds its way in, which is why flashing is the first thing we check on any leak call.
What are the signs of a chimney flashing leak?
Stains near the fireplace, dampness on the chimney breast, rust streaks below the flashing, and cracked sealant where flashing meets masonry. From the attic, you may see daylight around the chimney or damp insulation nearby.
Can flashing be resealed, or does it need replacement?
If the metal is intact and only the sealant failed, careful resealing can work. If the metal is rusted, bent, or was installed wrong originally, resealing is temporary and the flashing should be rebuilt. We show you which situation you have before recommending anything.
What is a pipe boot, and why does it leak?
A pipe boot is the collar sealing around plumbing vent pipes through the roof. Rubber boots dry out and crack in intense sun, letting water run down the pipe into the house. It is one of the most common and most fixable leak sources we see.
How long does flashing repair take?
A single pipe boot or skylight curb reseal usually takes a few hours. A full chimney flashing rebuild is typically a half to full day. You get a clear timeframe with your written assessment.
My roof is only a few years old. Why is the flashing leaking?
Usually workmanship: sealant used instead of proper step flashing, counter flashing never embedded in masonry, or products that could not handle the heat. Poor flashing on a new roof is one of the most common leaks we fix. Call (626) 719-0138 and we will diagnose it properly.
Roof assessment
Stop the Leak Where It Starts
Chimney, vent, skylight, or valley, we will find the failed flashing and fix it right. One call, straight answers, no guesswork.