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 Repair Across Chillum
If you own a brick rowhouse or semi-detached home in Chillum, MD, your chimney likely carries decades of quiet wear: softened mortar joints, spalled brick faces, and flue liners that were sized for coal or oil back in the 1940s and 1950s. Top Hat Chimney has worked these exact stacks for over 29 years, and Wendell Pike and his crew know the shared-wall complications that come with Chillum’s postwar attached housing better than any franchise outfit ever will. Most Chimney Repair calls in Chillum start with a phone conversation: call (240) 618-3233 and you’ll talk to a live person, often Wendell himself, before a single tool comes off the truck.
A typical mortar repointing job on a Chillum rowhouse runs $650 to $1,400. A copper or stainless flashing repair on a shared-wall stack runs $350 to $850. A full clay-to-stainless liner replacement in an undersized Chillum flue runs $2,800 to $4,200. Those are honest numbers for this market, and you’ll get the same number in writing before work starts.
Why Top Hat Chimney Is Chillum’s Preferred Chimney Repair Company
Chillum is not a neighborhood where you can send a rotating cast of subcontractors and expect it to go well. The housing stock is dense, the flues are shared, and the issues are rarely as simple as needing Chimney Cleaning & Sweep - Chillum. Wendell founded Top Hat Chimney in 1999 and still answers the phone himself half the time. That matters to homeowners between 50 and 70 who have been burned by a national chain that quoted one price on the phone and another at the door. Around here, the sweep who shows up at your door is background-checked, in uniform, and he is likely the same person you’ll run into at the hardware store in Langley Park or along Riggs Road.
We publish our license number and our address. We do not hide behind a call center. Every completed job carries the 90-Day Done Right Promise in writing: if it’s not right, one call brings the crew back at no additional cost. That is not a marketing line. It is stamped on every invoice. We also offer a free second opinion on any written estimate you get from another company, $40 off any repair over $200, no trip charge inside the county, and a 10% discount always for seniors and veterans. For full details on all repair work, see our Chimney Repair service hub.
For homeowners in Chillum and the streets just off Ager Road, Chillum Road, and Sargent Road, we know that roof access is tight, parking is tighter, and a shared stack means you can’t just fix your side and walk away.
Our Chimney Repair Services in Chillum
Mortar Repointing in Chillum
Chillum’s soft lime mortar joints take a beating from 50 to 70 freeze-thaw cycles every winter. When water freezes inside a hairline crack, it expands and slowly pushes the mortar out of the joint. Repointing in Chillum usually runs $650 to $1,400 for a typical rowhouse stack, depending on access and how much of the bed joint needs to be cut out and replaced. Walk around your block and look at the chimneys. If you see white streaks or missing mortar between bricks, the stack is already bleeding moisture into the flue.
Spalling Brick Repair in Chillum
Spalled brick is the visible symptom of a hidden problem. Water gets behind the brick face, freezes, and pops the outer layer off in flakes or chunks. What you see is cosmetic. What you don’t see is the structural compromise behind it. In Chillum’s 1940s to 1960s stock, we regularly pull off a brick face that looked intact from the street and find failed flue tiles behind it. Repairing spalled brick on a Chillum chimney runs $450 to $1,100 for selective replacement, more if the damage runs deep enough to require reconstruction of a section of the stack.
Chimney Waterproofing in Chillum
Waterproofing is the cheapest insurance a Chimney Cap & Crown in Chillum repair can give you. We apply a vapor-permeable masonry sealant that keeps rain out while letting the brick breathe, which old lime mortar requires. A standard waterproofing treatment on a Chillum rowhouse chimney runs $300 to $600. Do it after repointing, not before, or you’ll trap moisture behind the sealant.
Flashing Repair in Chillum
Flashing is the metal transition where the chimney meets the roof. On a semi-detached Chillum home with a shared wall, the flashing detail is often installed against both roofs, and when one side leaks, the other side pays for it. We do step flashing, counter-flashing, and full replacement in copper, galvanized, or stainless steel depending on your existing roof material. Flashing repair in Chillum runs $350 to $850 for a typical repair, up to $1,200 if the shared-wall junction needs to be re-cut and re-flashed. This is not a job to put off: a failed flashing joint is the number one source of chimney leaks we see in Prince George’s County.
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 Chillum
We install and service chimney systems from Copperfield, DuraFlex, and Famco. When a Chillum chimney needs a Chimney Liner & Rebuild in Chillum or a rebuilt crown, we source from brands we have trusted for decades, not whatever is cheapest at the supply house that week. For Chillum customers specifically, we keep common liner diameters and cap sizes in stock so a repair does not wait on a warehouse order from Ohio. If your flue needs a serious fix, like a HeatShield resurfacing or a full Copperfield stainless liner replacement, you’ll see the camera footage before you ever approve the work.
Common Chimney Repair Problems We See in Chillum Homes
Here is what we actually find when we walk onto a Chillum roof:
- Hidden spalling behind intact brick faces. Freeze-thaw cycles attack the soft lime mortar inside the stack long before the outside shows it. By the time you see damage, the flue tiles are often already cracking.
- Cross-contamination from an adjoining rowhouse. A neighbor’s bathroom exhaust, HVAC upgrade, or blocked-off fireplace vented into the shared stack can push moisture, acidic condensate, and in serious cases carbon monoxide into your flue. You won’t smell it. We detect it when we pull the cap.
- Undersized or mismatched flue liners. Original clay liners sized for coal or large oil appliances are still in place in many Chillum homes. When a gas insert or smaller unit is installed, the liner is too big, the draft is weak, and creosote builds up faster.
- Failed mortar crowns. The crown is the concrete cap that sheds rain off the top of the stack. On 1950s Chillum rowhouses, crowns were often poured flush with the brick, with no overhang. Water runs down the brick face, into the joints, and straight into the flue. A proper crown rebuild runs $450 to $800 and adds decades to the stack.
Pricing for Chimney Repair in Chillum, MD
You should know the numbers before you call. A typical Chimney Repair in Chillum falls between $350 and $1,400 depending on what is actually wrong. Here is the breakdown for this market:
- Flashing repair or replacement: $350 to $850
- Tuckpointing or mortar repointing (full stack): $650 to $1,400
- Spalled brick face replacement (selective): $450 to $1,100
- Chimney waterproofing: $300 to $600
- Crown rebuild with proper overhang: $450 to $800
- Full clay-to-stainless liner replacement (Copperfield or DuraFlex): $2,800 to $4,200
- Partial chimney rebuild (above roofline): $1,800 to $3,500
The two biggest factors on a Chillum job are access and the shared wall. If we need a lift to reach a stack tucked between two tightly spaced rooflines, or if the neighbor’s side of the stack needs to be addressed, the labor hours go up. But you’ll know that before we start. Upfront pricing is not a gimmick. The number Wendell gives you on the phone is the number on the invoice. Call (240) 618-3233 for a free estimate.
We Also Serve Cities Near Chillum
Our crews work all around the Chillum area, including Bethesda, Potomac, North Bethesda, Chevy Chase, and the surrounding Prince George’s and Montgomery County neighborhoods. If you’re in one of those areas and need Chimney Repair in Chillum or anywhere nearby, the phone number is the same: (240) 618-3233. Same live person, same written pricing, same 90-Day Done Right Promise.
Serving Chillum, MD - Our Local Coverage Area
We’re based in the Chillum 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 Repair in Chillum
Look at the roof line. If your Chillum rowhouse is attached to the house next door and the chimney stack sits on the party wall between the two units, it is almost certainly a shared or adjacent stack. The easiest way to confirm is to check your property’s original plat or simply look in the attic: if the flue runs through the shared wall cavity, it is shared. That matters because a repair on your side may require access to the neighbor’s side, or a neighbor’s blocked flue may be creating drafting problems in yours. We handle that coordination every week in Chillum. Call (240) 618-3233 and we’ll look at it.
The risk is real and it is invisible. When a Chillum rowhouse neighbor reroutes a bathroom exhaust, installs a high-efficiency HVAC unit, or blocks off a fireplace, the venting has to go somewhere. If it gets pushed into the shared stack, the exhaust can pressurize the flue and push carbon monoxide back down into your home. You won’t smell CO. That’s the whole problem. We have found this exact condition on typical rowhouse streets near Riggs Road, and the only way to catch it is to pull the chimney cap and inspect the flue with a camera. If you haven’t had your flue inspected in years, do it now. Call (240) 618-3233 and we’ll pull the cap and show you the footage.
Because the mortar in Chillum’s postwar brick stacks is lime-based, soft, and decades old. Fifty to seventy freeze-thaw cycles per winter work water into every hairline crack. The freeze expands, the thaw relaxes, and over 60 winters that is thousands of expansion cycles. The joints erode from the inside out. The brick face can look perfectly fine while the bed joints inside the stack are crumbling. That is why we always inspect the flue with a camera before recommending any repair. The camera footage and a plain-English verdict, every time, no exceptions.
No. Not safely. A cracked clay flue liner in a Chillum rowhouse means combustion gases and heat are reaching the brick and the wooden framing around the stack. Brushing the flue won’t fix the crack; it’ll just move creosote around and give you a false sense that the chimney is fine. If the liner is cracked or spalled, the fix is a new stainless steel liner, usually a Copperfield or DuraFlex system sized for your current appliance. Continuing to burn with a failed liner is a chimney fire waiting to happen. Call (240) 618-3233 and we’ll give you camera proof of what is actually inside the flue.
On a Chillum semi-detached, flashing repair typically means removing the old step flashing where the chimney meets the roof, checking the counter-flashing embedded in the brick joints, and replacing the metal with new copper or stainless cut to fit both the roof plane and the shared wall junction. If the neighbor’s roof plane ties into the same stack, we also inspect their flashing and the shared wall transition. We don’t touch their side without permission, but we’ll tell you if the leak is coming from their side. Flashing repair on a Chillum semi-detached runs $350 to $850 for a typical repair. Call (240) 618-3233 for an exact quote, and remember: no trip charge inside the county.
Written by Wendell Pike, Owner at Top Hat Chimney, serving Chillum and surrounding communities since 1999.