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Chimney Leak Repair in SeaTac, WA
Water-testing SeaTac chimneys to find the real leak, then fixing the crown, flashing or brick that causes it. 15 minutes from Renton.
- Serving SeaTac & King County
- Free 2nd-opinion quotes
- Price match + 10–25% discount
Free Chimney Leak Repair Quote in SeaTac
We'll confirm a time by phone or text.
A leaking chimney in SeaTac usually announces itself in November as a stain on the ceiling or a damp smell near the fireplace in a McMicken Heights or Riverton Heights rambler. The chimneys in those 1950s-70s houses have had fifty-plus winters to develop the usual entry points: a crown poured flush with the brick and now cracked through, step flashing that has pulled away from the mortar, a missing cap letting rain straight down the flue, and brick faces so saturated that water wicks through to the drywall. In the townhomes along Military Road and International Boulevard the leak is almost always at the prefab chase: a rusted cover, a loose storm collar, or siding that has pulled away from the top trim.
We find the source before we fix anything, because sealing the wrong part just moves the stain. We water-test from the top down, then repair the flashing, rebuild the crown, replace the cover or collar, or treat saturated brick with a breathable water repellent. The quote is free, there is a free second-opinion quote if you have been told the chimney must come down, and we price match plus 10-25% off any written bid. SeaTac is about 15 minutes from our North Renton office.
Symptoms
Signs SeaTac homeowners notice
- Water pooling in the firebox or dripping from the damper after rain
- Brown stain on the ceiling or wall beside the chimney that grows during the wet season
- White crusty efflorescence on the brick inside or outside
- Rust streaks down the siding of a framed chimney or down the face of the brick
- Spalling brick faces or crumbling mortar near the top of the chimney
- Damp firebox walls even when it has not rained for a day or two
SeaTac Conditions
Why this happens in SeaTac
SeaTac's own airport station explains the leaks. The 1991-2020 normals show 40.34 inches of rain a year, with about 29.65 inches between October and March and November alone averaging 6.31 inches. That is half a year in which masonry almost never dries. Brick that stays saturated that long passes water through to the inside, which is why a chimney with a sound crown and good flashing can still stain a Bow Lake ceiling. The Brick Industry Association's technical notes tie that saturation to efflorescence and cracking as well as leaks.
The freeze-thaw record finishes the job. Winter lows average 37-38 degrees and roughly 60 days a year touch freezing, so a hairline crack in a crown fills with water, freezes, and widens a little each night before thawing by noon. By spring it is a channel. Moss on the shaded north face, which regional roofing guidance says spreads fastest from October through April, keeps that crack wet between storms.
How It Works
Our chimney leak repair process
Map the symptom
We ask where the water shows up, when, and how long after rain, because each entry point leaves a different signature.
Check the top
Crown, cap and chase cover are inspected first, since they are the most common leak sources and the fastest to rule in or out.
Check the roofline and masonry
Flashing, mortar joints, spalled brick and the flue itself are checked, including for condensation that mimics a leak.
Fix in the right order
We repair the entry points that are actually leaking, from the top down, and leave the sound ones alone.
Water-test and follow up
Where possible we run water on the repair to confirm it is dry, and if the next storm proves us wrong, we come back at no charge.
Full details, options and pricing factors on the main Chimney Leak Repair page.
Need chimney leak repair in SeaTac?
Call now or request a free quote — we confirm by phone or text.
☎ 206-453-2045 Request a QuoteQuestions
Chimney Leak Repair in SeaTac — FAQ
The wall next to my SeaTac fireplace is damp but the roof was just replaced. Why is it still leaking?
A new roof usually means new flashing, but it does not fix a cracked crown, a missing cap or saturated brick, and those are the most common leak sources on 1950s-70s SeaTac chimneys. We water-test the chimney in stages from the top to find where the water enters, then quote only that repair. The quote and the second opinion are both free.
Can you stop a chimney leak in SeaTac before the next storm?
Often yes. Caps, covers, collars and flashing can go on during a dry break, and we are about 15 minutes away, so a same-day or next-day visit is realistic. Crown rebuilds and water repellent need dry masonry, so in the wet months we seal temporarily and book the permanent work for a dry window.
How soon can you do chimney leak repair in SeaTac?
We confirm a time by phone or text after you request a quote; same-day service is often available for urgent problems in SeaTac and the rest of King County.
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