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.
Before
After
Before
After
Before
AfterFast, Reliable Chimney Liner & Rebuild Across Gaithersburg
A chimney liner replacement or partial rebuild in Gaithersburg typically runs $1,800-$4,600 depending on whether we’re relining an existing flue or rebuilding the masonry crown and chase. Most jobs in Montgomery Village and the surrounding 1966-1985 subdivisions are done in a single day once the liner is on the truck, and we do not ask you to wait around all afternoon for a window that never comes. If your clay tile liner has cracked, or your townhome shares a chimney stack with a neighbor, call (240) 716-5865 for a straightforward answer and a written quote before we touch a single tool.
Wendell Pike has been looking down Gaithersburg flues since long before the national brands started quoting one price on the phone and another at your front door. We work the same neighborhoods year after year, and we know what these particular chimneys do when a hard freeze hits. The number on the estimate is the number on the invoice. Always.
Why Top Hat Chimney Is Gaithersburg’s Preferred Chimney Liner & Rebuild Company
We have pulled more cracked clay tile liners out of Montgomery Village townhomes than we can count. The homes were built in waves between 1966 and 1985, and the original 6-inch clay flue tiles have been silently failing in unison. A homeowner on Wightman Road will see the same spalling we found two streets over on Goshen Road, because the chimneys were built by the same crews with the same materials. That pattern recognition is worth something. A sweep from outside the area has to learn it on your dime. We already know it.
Gaithersburg sits at roughly 450 to 550 feet of elevation, higher than DC and the lower-lying suburbs, which means harder and more frequent freeze-thaw cycles every winter. Water gets into a hairline crack, freezes, expands, and by March the crack is a quarter-inch gap. That is not a theory. That is what we see every spring when we inspect chimneys across Montgomery Village, Washingtonian Woods, and the older colonials off Route 355. Our Chimney Liner & Rebuild team schedules inspections around that reality, not around a corporate route map.
Every job ends with the 90-Day Done Right Promise in writing. If the liner settles, the crown cracks, or the draft is wrong, one call brings Wendell and his crew back at no additional cost. We put that on paper because we have been doing this since 1999. Ask anyone on your street whether the last chimney company did the same.
Our Chimney Liner & Rebuild Services in Gaithersburg
Stainless Steel Liner
For most Gaithersburg homes with a deteriorating clay tile flue, a stainless steel liner is the fix that makes sense. We install DuraFlex and Gelco liners sized to your existing flue, with a stainless top plate and cap. A stainless liner in a Montgomery Village townhome typically runs $2,400-$3,800 installed. It isolates the flue gases from the surrounding masonry, which matters when your chimney chase is shared with the unit next door.
Flexible Liner
Older Gaithersburg chimneys with offsets or misaligned clay tiles often cannot accept a rigid liner without tearing out brick. A flexible stainless liner bends through the existing flue path and gets the job done without opening up the masonry. We use flexible liners regularly in the 1970s townhome rows around Montgomery Village Avenue, where the original tile work was rarely dead straight. Cost is comparable to rigid stainless, usually $2,300-$3,700.
Liner Replacement
If your original clay tile liner has cracked at the smoke chamber, the only real fix is removing what is left and replacing it. In Gaithersburg townhomes this work frequently involves a neighbor’s flue running inches away inside the same stack. We isolate each flue as we work, and we rebuild the section of chase wall that separates the two units before reinstalling. A full liner replacement here averages $2,800-$4,600, depending on chase access and flue height.
Partial Rebuild
Many Gaithersburg chimneys do not need to come all the way down. When the damage is confined to the crown, the top courses of brick, and the flue tile, a partial rebuild restores the structure and stops the water intrusion at the source. In Olde Towne, where brick chimneys can date to the late 1800s, the crown is often the first thing to go. A partial rebuild with a new cast-in-place crown typically runs $1,800-$3,200. We will always show you the camera footage before we recommend it.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Gaithersburg
We install and service liners and chimney components from DuraFlex, Gelco, HeatShield, and Olympia Chimney. These are the brands we stock on the truck and trust in our own chimneys. When a Montgomery Village townhome needs a stainless liner, we are not ordering from a warehouse three states away and hoping it fits. We carry the common sizes and top plates for Gaithersburg’s housing stock, which means faster turnaround and fewer return visits. If your system uses a HeatShield resurfacing product or a specific Famco cap, we can source and install it without sending you to a third party.
Common Chimney Liner & Rebuild Problems We See in Gaithersburg Homes
- Cracked clay tile liners in 1966-1985 townhomes. The original 6-inch clay flue tiles have a rated service life that these homes passed years ago. Freeze-thaw at Gaithersburg’s elevation widens hairline cracks until the liner spalls apart at the smoke chamber. First-degree creosote is a brush job. A cracked liner is a rebuild.
- Spalled and gaping mortar crowns. The crown is the concrete cap on top of the chimney. Once it cracks, water follows the path of least resistance straight into the smoke chamber, where it accelerates liner failure. On Montgomery Village’s shared stacks, one failed crown can damage both flues before either homeowner knows.
- Deteriorating shared chase walls. In the dense 1970s townhome rows, two flues often run side by side inside one masonry stack. When the wall between them crumbles, smoke and carbon monoxide can migrate from one living space to the other. Most homeowners in Gaithersburg have no idea their townhome was built this way.
- Rusted-out flashing and caps on coastal Maryland chimneys. Even this far from the Bay, the humid air and hard winters work on galvanized flashing and caps. Stainless holds up. Galvanized does not. We see the difference every spring in Kentlands and Washingtonian Woods, where northern exposure and wind-driven rain accelerate the corrosion.
Pricing for Chimney Liner & Rebuild in Gaithersburg, MD
A stainless steel liner replacement in Gaithersburg typically runs $2,400-$4,600. A partial rebuild with a new crown lands between $1,800 and $3,200. A full chimney rebuild, when the structure itself is failing, starts around $6,000 and can run higher depending on height, access, and whether we are matching brick on an Olde Towne home. What drives the price: flue height, whether the chase is shared, how much masonry needs to come down, and whether the flashing is being replaced at the same time. We give you the number before the first tool comes off the truck. Call (240) 716-5865 for a free estimate, and we will show you the camera footage that justifies what we recommend. Nothing gets recommended that you cannot see for yourself.
We Also Serve Cities Near Gaithersburg
Beyond Gaithersburg proper, we work regularly in Montgomery Village, Rockville, Potomac, and Chevy Chase. The shared-chase townhome issue we see in Montgomery Village extends into parts of Rockville, and the older brick chimneys in Chevy Chase and Potomac bring their own set of rebuild challenges. Wherever you are in upper Montgomery County, the same crew, the same written guarantee, and the same plain-English camera report apply.
Serving Gaithersburg, MD - Our Local Coverage Area
We’re based in the Gaithersburg area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Chimney Liner & Rebuild in Gaithersburg
Yes. In Montgomery Village’s 1970s townhome rows, separate flues for adjacent units often run side by side inside a single masonry stack. A cracked liner or deteriorated chase wall in your neighbor’s unit can expose your living space to smoke infiltration and carbon monoxide. Your flue does not care how the fire looks. It cares how it breathes. If you suspect the chase wall between units has failed, call (240) 716-5865 and we will scope it with a camera. The footage and a plain-English verdict, every time, no exceptions.
Once a year, burn or no burn. Chimneys break in the off-season too. For a Montgomery Village townhome with the original clay tile liner from 1966-1985, annual inspection is the minimum. Freeze-thaw at Gaithersburg’s elevation works on those liners year after year, even when the fireplace is never used. A camera inspection shows you exactly what is happening inside the flue. Call (240) 716-5865 to book a sweep and inspection. The inspection is included with the cleaning, and senior and veteran discounts always apply.
Usually not. A cracked crown is the most common entry point for water, and water is what accelerates liner failure in Olde Towne’s older brick chimneys. If the brick below the crown is still solid and the flue is intact, we can do a partial rebuild: remove the old crown, install a new cast-in-place crown, repoint the top courses, and replace the flashing as needed. That runs $1,800-$3,200. We will only recommend a full rebuild if the structural brick itself is failing. Come on, we will show you the camera footage before we quote anything.
In Gaithersburg, the crown and flashing typically fail before the liner does. The crown is exposed to the full force of freeze-thaw from November through March. Flashing takes the brunt of wind-driven rain and the humid air that rolls in from the Bay. Once either fails, water reaches the smoke chamber and starts eating at the clay tile liner from the outside in. The liner is often the last component to visibly fail, but the one that costs the most to replace. That is why annual crown and flashing inspection matters. Call (240) 716-5865 for an inspection that looks at the whole system, not just the flue.
In most cases, yes. We use flexible stainless liners from DuraFlex or Gelco that follow the existing flue path without tearing out brick. The old clay tile liner is broken out from the top or through the cleanout, and the stainless liner is pulled through in its place. We isolate the flue from the neighboring unit as we work, then install a new top plate and cap to seal the system. Where the chase wall itself has deteriorated, we rebuild that section before closing up. No unnecessary demolition. Call (240) 716-5865 for a free estimate on your townhome, and ask for Wendell. He will tell you plainly whether your chase needs to be opened or not.
Get Your Gaithersburg Chimney Liner Inspected Before the Next Freeze
In Montgomery Village, off Wightman Road, we pulled a 6-inch clay tile liner that had spalled apart at the smoke chamber, leaving first-degree creosote smeared against a neighboring unit’s chase wall. We installed a DuraFlex stainless liner with a stainless top plate and cast-in-place crown, then rebuilt the shared masonry crown and flashing to isolate the two flues and restore draft before the next freeze-thaw cycle hit. That is the kind of Gaithersburg job no generic chimney page tells you about, because they have not done it. We have.
If your chimney has not been inspected this year, or if you suspect water is getting into the crown or chase, call (240) 716-5865. A live person answers, around the clock, and it may well be Wendell himself on the line. We will schedule a time, show up in a marked truck, and give you a written quote before any work begins. Senior and veteran discounts always apply, and there is no trip charge for calls inside the county.
Written by Wendell Pike, Owner at Top Hat Chimney, serving Gaithersburg and upper Montgomery County since 1999.