Chimney flashing repair restores a watertight seal where your chimney meets the roof, without replacing the flashing entirely. If the step and counter-flashing metal is still sound but water is getting behind it, a repair typically means resealing the joints, re-bedding counter-flashing that has pulled out of the mortar, and replacing sealant that has dried, cracked, or shrunk. Flashing is the layered sheet metal that bridges that vulnerable joint, and it is one of the most common sources of chimney leaks. Caught early, a repair is far less involved and less costly than repairing the water damage a slow leak causes inside your home.
What flashing repair covers
Chimney flashing is built in two layers. Step flashing is a series of L-shaped metal pieces woven into the shingle courses and turned up against the chimney. Counter-flashing is a second layer set into the chimney's mortar joints and folded down over the step flashing, so water sheds outward instead of slipping behind. Repair addresses the seal and the fit of that existing system rather than swapping it out.
- Resealing the joint between the counter-flashing and the masonry with the correct flashing-grade sealant
- Re-bedding sections of counter-flashing that have worked loose from the mortar reglet
- Removing old, brittle, or cracked sealant and replacing it cleanly
- Tightening or refastening loose metal and correcting minor lifted edges
- Confirming the step flashing is still lapped correctly beneath the counter-flashing
When the metal itself is corroded through, torn, or was never installed correctly, repair is no longer the honest answer. That is full flashing replacement, which is a separate scope. Reglet cutting and fresh counter-flashing installation on a chimney that never had proper counter-flashing also fall outside a straightforward repair.
Signs you may need flashing repair
- A water stain on the ceiling or wall near the chimney, especially after wind-driven rain
- Visible gaps, lifted edges, or peeling sealant where the metal meets the brick
- Rust streaks running down the chimney or onto the roof
- Dampness or a musty smell in the attic around the chimney chase
- Sealant that looks cracked, chalky, or pulled away from the masonry
What to expect from the process
A proper repair starts with finding the actual leak, not guessing at it. A technician inspects the flashing, crown, cap, and surrounding masonry to confirm where water is entering. If the flashing is the culprit and the metal is sound, the failed sealant is cleaned out, loose counter-flashing is re-bedded into the mortar joint, and the joints are resealed with a flashing-appropriate product. You should expect a clear explanation of what was found, what was repaired, and whether any neighboring issue — a tired crown or a missing cap — also needs attention.
Why use a professional
Flashing work happens at the roofline, and doing it well means knowing how the layers are supposed to interlock. A repair that simply buries the joint in caulk hides the problem for a season and lets water keep working behind the metal, where it can reach the roof sheathing, framing, and the ceiling below. There is also an honest overlap here: both roofers and chimney companies work at this joint. A chimney specialist brings the masonry side — mortar reglets, crown, cap, and how the whole chimney sheds water — into the picture. Our guide on whether to call a roofer or a chimney company for a leak walks through which trade fits which situation.
Why this matters in the Puget Sound climate
Greater Seattle's long wet season means the roof-to-chimney joint is tested by rain for months at a time, and wind-driven rain pushes water at angles that a compromised seal cannot handle. UV exposure and seasonal temperature swings also make old sealant shrink and grow brittle over the years. Because a small flashing failure here has constant moisture to exploit, catching and repairing it early genuinely prevents the slow interior damage that turns a modest fix into a much larger one.
Frequently Asked Questions
How long does a chimney flashing repair last?
A quality repair that re-beds the counter-flashing and reseals with the right product holds up for years, though sealant is a wear item and gradually breaks down under UV and weather. Having the flashing checked every couple of years catches an aging seal before it fails.
Can flashing be repaired, or does it always need replacing?
If the step and counter-flashing metal is still sound and the problem is failed sealant or a section that has pulled loose, a repair is usually the right call. When the metal is rusted through, torn, or was installed incorrectly to begin with, replacement is the honest fix. That judgment needs an on-site look at the actual condition of the metal.
Will you just caulk over the gap?
No. Caulk smeared over a joint as the only fix is exactly what fails within a few years. A proper repair cleans out the old sealant, re-seats loose counter-flashing into the mortar, and reseals so the layered metal sheds water the way it was designed to.
Do I need a chimney company or a roofer for flashing?
Both trades work at the roof-to-chimney joint, so it depends on the situation. If the masonry side is involved — the mortar reglet, crown, or cap — a chimney specialist is well suited. Our blog on choosing a roofer versus a chimney company breaks down the difference.