Chimney Leak Repair in Portland, OR
A chimney leak almost never starts where the water shows up. We find the actual source first — crown, flashing, cap, mortar, or condensation — so you fix it once instead of paying twice for the same drip.
We Find the Leak Before We Fix Anything
Water travels. A stain on the ceiling beside the fireplace can trace back to flashing eight feet up the roofline, and a damp firebox is often a cracked crown letting rain run straight down the flue. Guessing at the source means paying for a repair that doesn't stop the water.
So every leak call starts the same way: a full top-to-bottom chimney inspection — crown, cap, flashing, mortar joints, and the flue itself. Once we know exactly where the water gets in, the repair is straightforward. That's the order it has to go in.
The Five Places Chimneys Leak
After 26+ years working on chimneys, we can tell you nearly every leak comes down to one of five sources — and sometimes more than one at a time:
- Cracked crown — the concrete slab on top splits, and rain seeps into the masonry below it. See chimney crown repair.
- Failed flashing — the metal seal where the chimney meets the roof pulls loose or rusts through. Usually the first place we look. See flashing repair.
- Missing or damaged cap — without a cap, rain falls straight down the open flue.
- Porous brick and mortar — aging masonry soaks up water like a sponge and wicks it indoors.
- Condensation — moisture forming inside a cold flue, often mistaken for a roof leak.
Each source takes a different repair. That's why the diagnosis matters more than the patch.
Oregon Rain, and Why Winter Makes It Worse
The Portland metro doesn't get dramatic storms so much as months of steady rain — and that's exactly what chimneys hate. Masonry that shrugs off a passing shower stays wet from October to May, and small entry points that never showed themselves in summer start letting water through.
Winter compounds it. Water sitting in a hairline crack freezes on cold nights, expands, and pries the crack wider, so every freeze opens a bigger path for the next rain. A leak you notice in November is nearly always worse by February, which is why we don't recommend waiting for spring.
What a Proper Fix Includes
Once we've pinned down the source, we repair that — not whatever is easiest to reach. That might mean rebuilding a crown, resetting flashing, fitting a new cap, or repointing failed mortar, using the right method for your chimney, whether it's masonry, prefab, a wood stove, or a fireplace insert.
Where brick and mortar have gone porous, we'll recommend chimney waterproofing with a breathable sealer so the masonry sheds rain without trapping moisture inside. Then we verify the water has actually stopped. Qualifying work is backed by our written quote before any work.
Free Leak Estimates Across the Mid-Portland metro
Green Chimney is a service-area company — no storefront, we come to you. We cover Portland and the whole metro: west to Beaverton, Hillsboro and Forest Grove, south to Lake Oswego, Tigard, Tualatin and Wilsonville, east to Gresham, Troutdale and Sandy, and north across the river to Vancouver, Camas and Battle Ground. We hold 500+ customer reviews and a 5.0 rating on Google, and we're open 8am to 10pm Sunday to Thursday, because water doesn't keep business hours.
Estimates are free. Call (503) 758-1555, tell us what you're seeing — a stain, a drip, a musty smell near the fireplace — and we'll find where it's really coming from.
FAQs
Why does my chimney only leak when it rains hard?
Small cracks in a crown or gaps in flashing only admit water once the masonry is saturated or wind is driving rain sideways into them. A quick shower drains off before it finds the opening; a long Oregon soaker doesn't. That's also why these leaks appear in fall and seem to vanish in July.
How do you know it's the chimney and not the roof?
We inspect each component separately — crown, cap, flashing, masonry — and trace the water path from the entry point down, instead of guessing from where the stain sits. Sometimes it genuinely is the roof, and if so we'll tell you straight rather than sell you a chimney repair.
Can I wait until summer to fix a chimney leak?
You can, but it usually costs more by then. Freeze-thaw cycles through the winter widen every crack the water sits in, and masonry that stays wet keeps deteriorating all season. Fixing a leak when you first notice it is nearly always the cheaper repair.
Do you repair leaks on prefab chimneys and wood stoves?
Yes — we work on all chimney types: masonry, prefab, wood stoves, and fireplace inserts. Prefab chimneys leak differently, usually at the chase cover or storm collar rather than a crown, but the diagnose-first approach is exactly the same.