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Chimney Crown Rebuild in Issaquah, WA
Cracked, mossy crowns on Issaquah’s brick chimneys rebuilt to shed water. Starting at $299.
- Serving Issaquah & King County
- Free 2nd-opinion quotes
- Price match + 10–25% discount
Free Chimney Crown Rebuild Quote in Issaquah
We'll confirm a time by phone or text.
The crown is the concrete cap on top of a brick chimney, and on an Issaquah chimney it is usually the mossiest surface on the whole house. Crowns on the older homes in the valley and on the foothill slopes were often poured as a thin mortar wash, flush with the brick, with no overhang and no drip edge. In a shaded lot that kind of crown stays wet, grows moss, cracks, and lets water straight into the brick and liner tiles underneath. A crown rebuild removes the failed slab and pours a new one that is thicker, sloped, and overhangs the brick so water falls clear of the chimney.
Newer Issaquah homes in the Highlands, Talus, and similar plats usually have prefab chimneys with a metal chase cover rather than a crown; for those see our chase cover replacement page. For brick chimneys, crown rebuilds start at $299. The quote is free, we price match plus 10-25% off any written quote, and since Issaquah is a short hop from Renton on I-90, scheduling is quick. If you are not happy with the finished crown, we are not done.
Symptoms
Signs Issaquah homeowners notice
- Pieces of concrete or mortar missing from the top edge of the chimney
- Cracks wide enough to see daylight or fit a coin into
- The crown is flat or dished in the middle so water pools on it
- No overhang: the slab ends flush with the brick faces
- The top two or three courses of brick are spalling or loose
- A previous crown sealant is peeling off and the cracks underneath have reopened
Issaquah Conditions
Why this happens in Issaquah
Moss is the crown’s enemy in Issaquah. The Pacific Northwest extension handbooks describe moss flourishing in winter and spring on plentiful water, low-to-moderate light, and moderate temperatures, and regional roofing guidance adds that it spreads fastest from October through April on tree-shaded surfaces that dry slowly. A crown under Issaquah firs is that surface. Moss holds water against the concrete and its rhizoids can lodge in cracks, so the crown typically stays saturated through a wet season that delivers about 73% of the year’s 40.34 inches of rain.
Saturated concrete then meets the Puget Sound freeze-thaw pattern: roughly 60 days a year touching 32F, but only about 4 that stay frozen all day, with Sea-Tac winter lows averaging 37.1F to 37.7F. The Brick Industry Association ties repeated freeze-thaw on saturated masonry to cracking, spalling, and disintegration, which is why a mossy Issaquah crown typically goes from hairline crack to crumbling edge within a few winters.
How It Works
Our chimney crown rebuild process
Remove the failed crown
We break out the old slab or mortar wash down to solid brick, protecting the flue opening so debris does not fall into the chimney.
Repair the top courses
Any loose or spalled brick in the top courses is reset or replaced so the new crown sits on sound masonry.
Form with overhang and slope
We build a form that projects past the brick faces on all sides and slopes the surface away from the flue so water runs off instead of sitting.
Pour and finish
The crown is poured in a single placement with a bond break around the flue tile so heat expansion does not crack it, and a drip edge is formed on the underside of the overhang.
Cure and seal
Once cured, we apply a breathable water repellent and, where useful, a flexible sealant at the flue joint. A new cap goes on if the old one is damaged.
Full details, options and pricing factors on the main Chimney Crown Rebuild page.
Need chimney crown rebuild in Issaquah?
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Chimney Crown Rebuild in Issaquah — FAQ
Should I have the moss removed from my Issaquah chimney before the crown is rebuilt?
We handle that as part of the job. The old crown and the moss on it come off together, and we clean the top courses of brick before forming the new crown. If the brick below the crown has moss in the joints, we tell you during the free quote whether repointing is needed too, so the new crown sits on sound masonry.
Does the new crown need dry weather to cure?
A few dry days help. With about 3 inches of rain total across June through August in the regional normals, summer is the easiest time, but we rebuild crowns through the wet season too, protecting the fresh pour with covers. If your crown is actively leaking in November, call; we can seal it temporarily and schedule the rebuild.
How soon can you do chimney crown rebuild in Issaquah?
We confirm a time by phone or text after you request a quote; same-day service is often available for urgent problems in Issaquah and the rest of King County.
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