Level 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
Olympia Chimney Crown Repair: The Gaithersburg Owner’s Guide
An Olympia Chimney crown repair in Gaithersburg typically runs $650-$1,450 installed, depending on crown size, existing damage depth, and whether the flue needs resealing at the same time. We stock Olympia Chimney-compatible crown materials on our trucks, and most repairs are completed in one visit. You usually find out your crown failed the same way most of our Gaithersburg customers do: a water stain on the ceiling near the fireplace, a musty smell in summer, or a chimney sweep who pointed a camera at the top and showed you a cracked, spalled crown surface.
The crown is the concrete or mortar cap at the very top of the chimney, and when it cracks, water gets behind it and into the brick. In Gaithersburg’s freeze-thaw cycle, that water expands every winter and turns a hairline crack into a structural problem faster than in drier climates. If you have an Olympia Chimney product up there, the crown takes the same beating as everything else in Montgomery County.
Which Olympia Chimney Models This Applies To
Olympia Chimney manufactures crowns and caps that fit a range of residential masonry and prefabricated chimney systems. The compatibility question matters because an Olympia crown isn’t a universal part. The inside dimension of the crown opening has to match your flue tile or liner outside diameter, not just look roughly the same as a stock cap at the hardware store. We measure the flue OD and the outside dimensions of the brick stack before we quote anything. Our techs pull the camera out before quoting, and measurements and photos go into every estimate, not approximations.
Level Two Chimney Gaithersburg is an independent service provider, not affiliated with Olympia Chimney. We install Olympia-compatible crowns and caps because they hold up in Maryland weather, but the same job can be done with quality aftermarket equivalents from Gelco or Copperfield if the exact Olympia part isn’t the best fit for your chimney. The decision comes down to the flue measurement. A crown that doesn’t shed water past the brick edge by at least two inches isn’t doing its job, regardless of brand. That’s the gotcha we see most often: a replacement crown that overlaps correctly on the top but doesn’t extend past the brick face, and within two winters the spalling starts again.
Signs Your Olympia Chimney Crown Repair Is Failing

- Water staining on the ceiling or wall near the fireplace. This usually means the crown has cracked enough to let water run down the outside of the flue liner and into the masonry. The stain shows up inside long before the brick outside looks bad.
- Spalling brick or concrete flakes on the roof near the chimney. When the crown surface breaks down, chunks of mortar and concrete end up in the gutter or on the shingles. If you’re finding debris, the crown has already lost its top layer and is exposing the softer material underneath.
- Eroded or cracked mortar joints in the top three to four courses of brick. Water that gets past a failed crown doesn’t stay at the top. It seeps down through the mortar bed, and those top courses show it first with crumbling, white efflorescence, or loose bricks.
- Visible cracks on the crown surface itself. If you can see a crack from the ground with binoculars or from a ladder, it’s already deeper than it looks. Crown cracks widen with every freeze cycle, and in Gaithersburg we get enough freezes each winter to make a visible crack a one-season issue.
- Rust stains running down the chimney chase or crown edge. If your Olympia crown or cap has a metal flange or screen, rust means water is pooling where it shouldn’t. The rust trail is the clue that the crown isn’t shedding water the way it was designed to.
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AfterReplacement Cost & What’s Included
Here’s the honest price picture for Gaithersburg. A standard Olympia Chimney crown repair on a single-flue chimney runs $650-$900. A larger crown, a two or three flue setup, or a crown that needs partial teardown and reform runs $900-$1,450. If the flue liner top section is damaged at the same time, that adds $300-$600 depending on liner type and accessibility.
- Crown inspection and camera documentation: included.
- Removal of old, spalled crown material: included.
- New crown form and pour with proper overhang and drip edge: included.
- Flue reseal and crown-coat sealant (Gelco or equivalent): included.
- Photo record of the finished crown: included.
- Written warranty covering materials and workmanship: included.
You get a written price and written scope before anyone starts. That’s Haven Standard Clause 1, and we’ve done it that way on every one of the 38,000 plus chimneys we’ve inspected and cleaned since 2009. If a competitor has given you a written estimate for the same work, bring it in and we’ll give you a free second opinion on it, in writing.
DIY or Call Us?

You can safely do a ground-level visual check with binoculars: look for cracks in the crown, flaking brick, or a cap that looks shifted. You can also check your attic for staining around the flue chase. What you can’t safely do is get on a roof with a bucket of crown-coat and patch cracks yourself. Crown repair on a Gaithersburg roof means working at height, on a ladder, usually near a power line, with tools and material that can send you off balance. Falls from roof height are the most common injury we see in this trade, and a cracked crown isn’t worth that risk.
The camera doesn’t guess. Neither do we. Call (240) 220-9395 and we’ll put a camera on the crown, show you exactly what’s there, and give you a written price for the repair. If it can safely wait a season, we’ll tell you that too. If it can’t, we’ll show you why with photos before we ask you to spend a dollar.
FAQs
A properly poured crown with a good drip edge and sealant lasts 15 to 25 years in Montgomery County, with the freeze-thaw cycle being the main factor that shortens it. Crowns that were originally poured too thin or without enough overhang can fail in under 10 years. We photograph the crown on every visit and can tell you where yours is in that range. Call (240) 220-9395 and we’ll get you on the schedule for a camera look.
Hairline cracks can sometimes be sealed with a crown-coat system, but any crack wider than a dime or any area where the crown surface has started to spall usually means the structural layer underneath is compromised and a full crown re-pour is the only fix that lasts. We’ll show you the camera footage and let you see the crack measurement before we recommend anything.
Most single-family Gaithersburg crown repairs are completed in 4 to 6 hours, including teardown, form work, pour, and seal. We need dry weather and a temperature above 40°F for the material to cure properly, so winter repairs get scheduled around Maryland’s freeze days. You get a documented photo record of the finished work before we leave.
We stock Olympia-compatible crown materials and caps on our trucks, along with equivalents from Gelco and Copperfield, so most crown jobs don’t require a parts order. If your chimney needs a custom-sized Olympia cap or crown form, we can usually source it within a few days through Haven’s network, which includes DuraFlex, HeatShield, Gelco, Olympia Chimney, Famco, and Copperfield.
Written by Corrine Halstead, Owner, Level Two Chimney Gaithersburg at Level Two Chimney Gaithersburg, serving Gaithersburg and nearby areas.





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