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Chimney Crown Repair & Crown Sealing in Seattle
Catch a cracked crown early and a flexible sealant is all it needs. We tell you honestly whether yours can be repaired or has to be rebuilt.
- Free 2nd-opinion quotes
- Price match + 10–25% discount
- Same-day service often available
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Chimney crown repair is the small job that prevents the big one. The crown is the concrete top of a masonry chimney, and like any concrete outdoors it develops hairline cracks as it ages. Those cracks are not a structural problem by themselves. The problem is that each one is an open channel for rain into the brick, and in Seattle the rain comes for six months straight. Crown sealing fills the cracks and covers the whole surface with a flexible, waterproof coating that stretches as the chimney heats and cools.
This page covers repairing a crown that is still solid. If the slab is crumbling, missing chunks, or was only a thin mortar wash, sealing it is throwing money at a surface that will keep moving, and the right answer is a crown rebuild. The line between the two is the most useful thing we can tell you at the free quote, and we are not shy about saying a coating is enough when it is.
Crown repair suits any brick chimney in King, Pierce, or Snohomish county that has a real poured crown. Same-day service is often available because the work is done in one dry visit.
Symptoms
Signs you need chimney crown repair
- Fine cracks across the crown surface, often radiating out from the flue
- A gap opening between the crown and the flue tile
- Surface pitting or a chalky, weathered texture on the concrete
- Dark damp patches on the crown that stay wet long after the roof has dried
- White mineral staining (efflorescence) on the brick just below the crown
- Small flakes of concrete in the gutter but the slab itself is still solid
- An old coating that has lifted at the edges but the crown underneath is intact
Common causes
- Normal shrinkage cracking as the concrete cured and aged
- Thermal movement: the flue heats faster than the crown and pulls the joint open
- Water soaking into tiny cracks and freezing, which widens them a little every winter
- Moss and debris sitting on the crown and keeping it wet
- A rigid patch or mortar smear used previously that could not flex and cracked again
How It Works
Our chimney crown repair process
The first thing we establish is whether the crown is sound enough to repair. We tap and probe the slab, measure crack widths, check for rocking or separation from the brick, and look at the flue-to-crown joint. Solid with narrow cracks is a sealing job. Hollow-sounding, moving, or losing pieces is not, and we quote the rebuild instead of selling a coating that will fail. We also check the cap and flashing, because a crown leak and a flashing leak can show up in the same spot inside.
Clean the surface
We remove moss, dirt, loose material, and any old failed coating so the new sealant bonds to clean concrete.
Fill the cracks
Cracks are opened slightly, cleaned, and filled with a flexible crown-repair compound rather than rigid mortar, so they can move without reopening.
Seal the flue joint
The gap between the flue tile and the crown gets a high-temperature flexible sealant that lets the flue expand without tearing the joint.
Apply the crown coat
A brush-on elastomeric crown sealant goes over the entire surface, lapping down over the edge, in the number of coats the product calls for.
Check cap and flashing
We confirm the cap is secure and the flashing sealed, then send you photos of the finished crown.
Options
Repair and service options
Crown repair is a spectrum, and we match the fix to the condition:
- Crack fill and coat: the standard repair for a solid crown with cracks. Flexible filler in the cracks, elastomeric coating over everything.
- Coat only: for a crown that is weathered but not yet cracked, as prevention. Cheapest option and the one most often skipped.
- Crack fill, coat, and flue-joint seal: when the gap at the flue tile has opened. This joint is the most common leak path on an otherwise decent crown.
- Repair today, rebuild later: if the crown is borderline, a coating can buy a season or two while you plan for a rebuild starting at $299. We will say which side of the line you are on.
All options are quoted free and in writing, and we match and beat any written competitor price by 10-25%.
Pricing
What affects the price
- Crown size and number of flues
- Crack count and width, which set the amount of filler needed
- Whether an old failed coating has to be stripped first
- Condition of the flue-to-crown joint
- Roof pitch and chimney height
- Whether cap or flashing sealing is added to the same visit
Every chimney is different, so you get a written quote after we look at the system. Ask about our price match and free second-opinion quote.
Safety & Seattle Conditions
Safety considerations
Crown sealing is quick, but it is still roof work at the top of the chimney. Leave the climbing to us; the free quote includes photos of the crown so you can see the cracks without going up. If you have noticed concrete flakes or a widening gap at the flue, go easy on the fireplace until we confirm the flue tile is intact, because a separated top tile can let heat into the masonry.
Seattle & Puget Sound conditions
Hairline cracks in a crown would be harmless in a dry climate. Around Puget Sound they are not. Seattle averages roughly 150-156 days a year with measurable precipitation, and the October-March wet season delivers about 29.65 inches, close to three quarters of the annual total. Water sits in the cracks, and with about 60 days a year dipping to 32F or lower, it freezes and widens them a fraction at a time; the Brick Industry Association notes that saturated masonry in freeze-thaw is what drives cracking and spalling.
Moss keeps the crown wet longer. Regional guidance says Western Washington moss spreads fastest October to April on shaded, slow-drying surfaces, so clearing it is part of every crown repair.
Our Work
Chimney Crown Repair in action
Seal the crown before the rain does the damage
Call 206-453-2045 for a free quote. Free second opinion on any other crown quote, price match plus 10-25% off.
☎ 206-453-2045 Request a QuoteQuestions
Chimney Crown Repair FAQ
What is chimney crown sealing?
Crown sealing means filling cracks in the crown with a flexible compound and then coating the entire top with a waterproof elastomeric product made for chimney crowns. It stays flexible, so it moves with the concrete instead of cracking like a mortar patch would. It is the right fix for a crown that is structurally sound but letting water through its surface.
Can a cracked chimney crown just be patched with mortar?
It can, but it rarely lasts. Mortar is rigid and the crown keeps expanding and contracting, so the patch cracks along the same lines within a season or two. A flexible crown-repair compound and coating are designed for that movement. If a previous mortar patch on your crown has already failed, that is normal and it does not mean the crown needs rebuilding.
How do I know whether my crown needs repair or a rebuild?
If the slab is solid, sits firmly on the brick, and the damage is cracks and surface wear, it is a repair. If it is crumbling, missing sections, flat with no overhang, or rocks when pushed, it is a rebuild. We check during the free quote and show you photos. The crown rebuild page covers the other side of that line.
Is a cracked chimney crown dangerous?
Not immediately, but it is the start of most chimney water damage. Water entering through the crown soaks the brick, freezes, and spalls the faces; it can rust a damper, stain a ceiling, and loosen the top courses over time. Catching it at the crack stage is the cheapest point to stop it. If the flue tile has separated from the crown, have it inspected before heavy fireplace use.
How long does crown sealing take?
Usually one visit. Cleaning, crack filling, and the first coat go on the same day, with a second coat if the product requires it. The coating needs dry conditions to cure, so we pick the day with the forecast in mind. Same-day service is often available in the drier months.
Can the crown be sealed in the rain?
No, the surface has to be dry for the filler and coating to bond. In the wet season we watch for a dry window, and there usually is one even in winter. If water is actively coming in, we can often do a temporary measure first and return for the proper sealing when the crown has dried. We check the flashing and cap on the same visit.
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