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.
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AfterFast, Reliable Chimney Repair Across Commack
Chimney repair in Commack usually costs between $200 and $900 for repointing and flashing work, and $3,800 to $7,500 when a gas conversion has left you needing a new flue liner. We quote that number before a single tool comes off the truck, and the number on your invoice matches the number on the phone. Wendell Pike has owned Top Hat Chimney since 1999, and he still answers the phone himself half the time. Call (631) 502-3612 and tell us what you’re seeing.
Commack homes carry a very particular set of chimney problems. Most of them were built between 1950 and 1975, and nearly all of them started their lives burning fuel oil. The clay tile flues sized for those old oil burners are now 50 to 70 years old, and thousands of them were never relined when National Grid brought natural gas through. That one fact drives more of our repair work in Commack than anything else.
Why Top Hat Chimney Is Commack’s Preferred Chimney Repair Company
We’re not a franchise that rotated in last spring. Wendell has been inside more Commack flues than he can count, including the cul-de-sacs off Harned Road, the older split-levels near Burr Road, and the ranch blocks around Scholar Lane. When you call, a live person answers, around the clock. It may well be Wendell himself, and if it isn’t, it’s someone who works out of the same truck fleet that serves your street.
Ask anyone on your street. We’ve worked the same communities since 1999, and Wendell puts his name and license number on every job. That’s not a marketing line. It means when something isn’t right, the same person who did the work comes back and makes it right. Every completed repair carries a 90-Day Done Right Promise in writing. One call brings the crew back at no additional cost if the repair didn’t hold. Commack homeowners also get a free second opinion on any written estimate from another company, and if you’re inside the county, there’s no trip charge.
Every tech who shows up at your door is background-checked and in uniform. You’ll get a real arrival window, and we call if it slips. Nobody changes the price at the door. That’s the whole point of the way we work.
Our Chimney Repair Services in Commack
The Chimney Repair work we do in Commack splits into a few recurring jobs. Here’s what we see most, and what each one costs in this market.
Mortar Repointing
Commack’s freeze-thaw cycles are hard on mortar. Wet Atlantic-influenced winters with repeated crossings of the freezing point push water into the joints, it freezes, it expands, and the mortar crumbles from the inside out. On a 1960s ranch off Jericho Turnpike, the joints may have looked fine in September and shown visible erosion by March. Repointing in Commack typically runs $400 to $900 depending on how much of the chimney face needs work and how high the access is. We match the original mortar color and texture, not a one-size-fits-all gray.
Spalling Brick Repair
Spalling is what happens when water gets behind the brick face and freezes. The brick face pops off in flakes and chunks, and once it starts, it doesn’t stop on its own. We see this constantly on the 1950s capes around Commack Road and the side streets off it. Repairing spalled bricks in Commack usually runs $350 to $800, depending on how many bricks need replacing and whether we need to cut and tooth in new units or can surface-patch the damaged area. If the spalling is widespread across multiple faces, you may be looking at partial rebuilding, which we’ll scope and show you on camera before quoting.
Chimney Waterproofing
A brick chimney in Commack is a sponge. Waterproofing stops moisture from getting in while still letting the masonry breathe, and it’s one of the cheapest repairs we do against the most expensive problem: a liner rotted out by decades of damp. On a Commack split-level, waterproofing typically runs $350 to $600. We use breathable masonry sealants that won’t trap moisture behind the brick, and we’ll tell you plainly if waterproofing is the right fix or if you actually need repointing first. Order matters, and we’ll explain it in plain English.
Flashing Repair
The flashing at the roof line is where most Commack chimneys leak. The original galvanized flashing installed in the 1960s or 1970s has a useful life of about 25 to 30 years, and nearly every home in Commack has flashing older than that. Rain pools at the roofline, finds the failed step flashing, and works down into the chase. We see it off Melrose Avenue, off Vanderbilt Parkway, everywhere the housing stock is the same age. Flashing repair in Commack runs $450 to $950 depending on whether it’s a simple re-seal or a full cut-in replacement with new step flashing and counter-flashing.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Commack
We install and service liners, caps, and dampers from DuraFlex, HeatShield, Famco, and Copperfield. When a Commack gas conversion has left an oversized clay flue that can’t vent properly, we typically recommend a DuraFlex stainless liner sized correctly for the new appliance. The parts we need for Commack jobs are stocked in our local trucks, so we’re not waiting on a warehouse shipment when the weather is turning cold and your chimney is open to the sky. If the repair needs a part we don’t have on hand, we’ll tell you before we start, not after.
Common Chimney Repair Problems We See in Commack Homes
- Shared flues between a converted gas furnace and a fireplace. On a cul-de-sac off Harned Road, our tech found a 1962 colonial where the oil-burner flue and fireplace flue shared one clay tile liner, a code violation that caused backdrafting into the basement. We scoped the flue, confirmed offset joints and third-degree creosote glaze, then installed a DuraFlex stainless liner and rebuilt the smoke chamber to restore proper draft before the first cold snap. This configuration shows up regularly in Commack homes that haven’t had a professional cleaning since the original oil furnace was replaced.
- Crown cracks and spalling from freeze-thaw cycling. Central Suffolk County’s winters cross the freezing point over and over. Water gets into the crown, freezes, and cracks the concrete. Same story on the brick faces. We find this on every street in Commack, and it’s a straightforward fix if it’s caught when the first hairline cracks appear, not three winters later when the crown is crumbling.
- Oversized clay liners after a gas conversion. A 1965 ranch chimney was built for a high-BTU oil burner. When you switch to an efficient gas furnace, the exhaust temperature drops. The liner is too big, the gas cools too fast, and the acidic condensate that forms eats away at the clay tile joints and, eventually, the flue itself. Homes throughout Commack’s older sections near the Long Island Expressway have this exact problem, and it’s a liner replacement, not a patch job.
- Failed flashing at the roofline. The original step flashing on a 60-year-old Commack chimney has given up. Water gets in wherever the chimney meets the roof, and the damage shows up as damp spots on the ceiling, rusted dampers, and crumbling brick below the roofline. We fix this all the time, and it’s one of the few repairs where the fix is genuinely permanent if the install is done right.
Pricing for Chimney Repair in Commack, NY
Here’s the honest number, for the Commack market specifically.
- Mortar repointing: $400 to $900
- Spalling brick repair: $350 to $800
- Chimney waterproofing: $350 to $600
- Flashing repair: $450 to $950
- Flue liner replacement (gas conversion, DuraFlex stainless): $3,800 to $7,500
- Chimney rebuilding (above the roofline): $2,200 to $6,000
What pushes a Commack repair toward the top of the range? Roof pitch and access, the height of the chimney, how much brick needs cutting out, and whether we’re matching a custom mortar color on a visible front-facing chimney. What doesn’t change: the number we quote on the phone is the number on the invoice. We don’t do add-ons at the door. Call (631) 502-3612 for a free estimate, and remember we knock $40 off any repair over $200, and seniors and veterans get 10% off all year.
We Also Serve Cities Near Commack
If you’re in the next town over, we’re there too. Top Hat Chimney serves East Northport, Kings Park, Smithtown, and Greenlawn with the same upfront pricing and the same 90-Day Done Right Promise. The housing stock in those towns has the same age, the same oil-to-gas history, and the same freeze-thaw damage we see in Commack. Call us and tell us what you’re looking at.
Serving Commack, NY - Our Local Coverage Area
We’re based in the Commack 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 Commack
Because the original clay tile flues were sized for oil burners that ran much hotter than modern gas furnaces. When you convert to gas, the exhaust temperature drops, the oversized flue can’t maintain enough heat to vent properly, and the acidic condensate that forms eats away at the mortar joints and tile. In Commack, where thousands of homes went through exactly this conversion over the last 20 years, a liner-condition assessment is the single most important part of any repair visit. If the liner is cracked, offset, or collapsed, a stainless liner sized correctly for the gas appliance is the fix. Call (631) 502-3612 and we’ll scope the flue and show you the footage.
Yes, and this is a real problem in Commack’s dense post-war subdivisions where chimneys are built back-to-back or share a common wall. If your neighbor’s gas furnace was connected to a flue that originally served your fireplace, or if the chimneys share structure and their new appliance is now venting into a deteriorating shared stack, you can get backdrafting, smoke pushing into your living room, and carbon monoxide entering your house instead of leaving it. If your neighbor converted and you’ve noticed your fireplace suddenly smoking or the house smelling like exhaust, call us. We’ll camera-scope your flue and trace where your air is actually going.
You don’t, and that’s exactly why we never quote a repair over the phone based on a description. Spalling can be surface-level, where a few brick faces have popped off and the damage is mostly visual. It can also mean water has penetrated deep into the chimney structure and is working its way down, which is structural. On Commack’s 1950s and 1960s capes and ranches, surface spalling usually runs $350 to $800 to fix. Structural repairs involving rebuilds run higher. The only way to know is to get up on the roof and look. We’ll do that, show you photos, and give you a written number before any work begins. The estimate is free, and we don’t charge a trip fee inside the county.
Yes. Your flue doesn’t care how the fire looks; it cares how it breathes. A gas furnace vents through the same chimney, and in Commack’s older homes, that chimney is 50 to 70 years old. Acidic condensate from gas exhaust attacks the clay tile and mortar even when you never light a fire. Annual cleaning and inspection catch liner deterioration, crown cracks, and flashing failure before they become a carbon monoxide problem or a collapsed flue. Once a year, burn or no burn. Chimneys break in the off-season too. Call (631) 502-3612 to schedule.
Crown cracks and deteriorated mortar joints from decades of freeze-thaw cycles. The ranch homes built throughout Commack in the 1950s have chimneys that are now 65 to 75 years old. The concrete crowns were poured thin, the mortar was mixed without modern bonding agents, and central Suffolk County’s Atlantic-influenced winters work those materials hard. We find hairline crown cracks on nearly every ranch we inspect in Commack, and if they’re caught early, the fix is a simple crown seal and repointing job, not a rebuild. If they’ve been leaking for years, the damage works down into the liner. Call (631) 502-3612 and we’ll tell you which one you’ve got, with camera footage and a plain-English verdict, every time, no exceptions.
Written by Wendell Pike, Owner at Top Hat Chimney, serving Commack since 1999.