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
AfterWhy Boston Homeowners Choose HeatShield Chimney Cleaning
We provide independent Heatshield in Boston chimney cleaning and repair service, specializing in the Cerfractory Flue Sealant and SmokTite Repair System in the city’s older masonry chimneys. Our crews handle HeatShield systems in triple-deckers, Victorian row houses, and Back Bay brownstones every week, and we document every application with a camera record before and after the work. Level Two Chimney Boston is not authorized by or affiliated with HeatShield. We’re an independent specialty chimney company that works on these materials daily, and we know where they hold up in coastal New England conditions and where they fail. Call (857) 567-8887 for a written price on HeatShield service in Boston.
Key Takeaways:
- We service and install HeatShield Cerfractory, SmokTite, Joint Repair, and CeCure systems throughout Boston.
- We’re an independent provider – not manufacturer-authorized, and we’ll tell you plainly when a HeatShield repair is the wrong call.
- Every job starts with a written scope and written price before work begins. That’s Clause 1 of the Haven Standard.
- We document every HeatShield application with before-and-after camera footage. You see exactly what we saw.
Why Trust Level Two Chimney Boston for Your HeatShield Chimney Cleaning?
HeatShield products fail in predictable ways, and our technicians have spent years learning those failure patterns in Boston’s specific housing stock. Corrine Halstead, our owner, learned flue measurement and liner assessment at BOCES Rockland in New York before building her reputation doing Heatshield repair in Cambridge and across Greater Boston, including years of sweep and inspection work on the older triple-deckers along Dorchester Avenue. That experience means our crews can tell you within the first camera pass whether a Cerfractory application will bond or whether the flue needs full stainless relining instead. We use genuine HeatShield materials whenever a repair is viable, because aftermarket sealants rarely match the thermal expansion characteristics of the original Cerfractory formula. We also stock HeatShield products locally for faster turnaround on Boston jobs, so you’re not waiting on a shipment from the Midwest while your flue sits open. Every technician who touches a HeatShield system in your home is background-checked, uniformed, and carries a written scope of work before anything starts. The camera doesn’t guess. Neither do we.
Common HeatShield Chimney Cleaning Problems We Fix in Boston
These are the HeatShield-specific issues our crews see most often in Boston chimneys, particularly in the city’s older masonry stock built between the 1880s and 1920s.
- Cerfractory sealant spalling or delaminating from flue walls. We see this on flues that have cycled through decades of Boston freeze-thaw winters. The sealant expands and contracts at a different rate than the surrounding brick or clay tile, and eventually the bond breaks. The fix starts with removing the loose material and retexturing the flue surface before reapplication.
- SmokTite coating peeling in flues with heavy creosote glaze. SmokTite will not bond to glazed creosote. If a previous contractor applied it over a dirty flue, you’ll see peeling within a season or two. We deep-clean with rotary brushes first, then reapply. On a Beacon Hill brownstone, our tech found a SmokTite coating peeling away from a clay flue that had never been properly cleaned before application. We removed the loose material, performed deep creosote removal, and reapplied after retexturing. Six months later, camera inspection showed the new bond holding with no further spalling.
- Joint repair material cracking at mortar joints. Boston’s Back Bay and South End brownstones sit on filled tidal land, and decades of differential settlement have caused chimney stacks in those neighborhoods to lean or crack. That movement transfers stress to the joints, and HeatShield’s joint repair material can crack as the structure shifts. We assess whether the movement is ongoing before deciding whether a joint repair will last.
- CeCure sleeve debonding at top or bottom termination. Prolonged moisture intrusion from a failed cap or crown is the usual culprit. The sleeve separates where water has been sitting, and the fix requires addressing the moisture source first, then rebonding the termination points.
- Cerfractory applied over an oversized flue from a fuel-conversion history. Many Boston chimneys burned coal, then oil, then converted to gas. The flue is badly oversized for today’s appliances, which causes condensation and accelerated creosote buildup. A Cerfractory application on an oversized flue without addressing the sizing issue is a temporary patch, not a fix.
BeforeAfterHeatShield Parts & Our Repair-vs-Replace Approach
We use genuine HeatShield Cerfractory and SmokTite materials whenever the existing system can be effectively repaired. The reason is simple: aftermarket sealants and coatings frequently fail to match the thermal expansion characteristics of the original product, and that mismatch is exactly what causes spalling and peeling in the first place. Our approach to repair versus replace is blunt. If the damage is limited to cracked mortar joints, minor spalling, or surface deterioration, a HeatShield repair makes sense and we’ll quote it. If the flue tiles are structurally compromised, if there are major cracks running through the masonry itself, or if the flue was never lined to begin with, we’ll tell you a HeatShield patch won’t hold and recommend full stainless steel relining instead. We’d rather lose a small repair job than sell you a coating that fails in two years. Call (857) 567-8887 and we’ll put our recommendation in writing with the camera evidence to back it up.
Our HeatShield Service Process - Step by Step
- 1
Diagnosis. We run an NFPA 211 Level 2 camera inspection down the full length of the flue. We’re looking at the condition of the existing HeatShield surface, checking for spalling, delamination, or bond failure, and assessing the underlying masonry. You get the photos.
- 2
Prep. If we’re working over an existing HeatShield coating, we remove loose material and prepare the flue surface. If creosote glaze is present, we deep-clean with rotary brushes before any sealant or coating goes on. SmokTite cannot bond to a dirty flue, and we will not apply it over one.
- 3
Application. We apply the HeatShield product per the manufacturer’s specifications, which includes surface temperature requirements. Boston’s cold-season temperatures can complicate this, which is why we schedule most applications between April and November.
- 4
Verification. After the material cures, we run the camera again. You see the before, the after, and the difference. If it’s not right, our 365-Day Done Right Promise means we come back and make it right.
- 5
Documentation. You walk away with the written scope, the written price, the photo record, and the written warranty. Clause 4 of the Haven Standard requires the photo record on every job. It’s been our practice since 2009.
HeatShield Products We Service & Install in Boston
We work on the full HeatShield product line: the Cerfractory Flue Sealant, the SmokTite Repair System, the Joint Repair System, and the CeCure Sleeve Relining System. Our crews use these materials on Boston’s older chimneys every week, from Dorchester triple-deckers and Heatshield in Quincy to South End brick row houses. We stock genuine HeatShield materials locally to keep turnaround fast. If you’re not sure which product your chimney needs, that’s exactly what the Level 2 camera inspection determines. A Cerfractory application makes sense for cracked mortar joints and minor spalling. SmokTite addresses surface deterioration and minor flue leakage. The CeCure sleeve is a relining option when the existing flue is oversized or damaged but structurally sound. Each product has a specific use case, and using the wrong one is how HeatShield systems get a bad reputation in Boston.
We Also Service These Brands
HeatShield isn’t the only product we work with. We also install and service DuraFlex stainless steel liner systems and Gelco chimney products across Boston. If a HeatShield repair isn’t the right path for your flue, we’ll tell you, and we’ll have alternatives ready. Being independent means we recommend the material that actually works for your chimney, not the one we’re incentivized to push.
FAQs - HeatShield Chimney Cleaning Service in Boston
No. We are an independent HeatShield service provider, not an authorized dealer or manufacturer representative. That independence matters: we have no incentive to recommend a HeatShield product over a stainless liner or any other solution if it’s not the right call for your chimney.
No. Cerfractory will not bond to glazed creosote, and any contractor who applies it over a dirty flue is setting you up for peeling and failure within a season or two. The flue must be deep-cleaned first as part of our Chimney Cleaning & Sweep services, usually with rotary brushes, and the surface retextured before application. We won’t skip this step, and we’ll show you the camera footage proving the flue was clean before the first coat went on.
No. SmokTite seals minor cracks and surface deterioration inside the flue, but it does not waterproof the chimney structure. Water intrusion in Boston chimneys almost always comes from the outside – failed caps, cracked crowns, spalling brick, deteriorated mortar joints. Those need to be addressed separately. A SmokTite coating on a chimney with an active moisture source is money spent on a symptom, not the cause. Call (857) 567-8887 and we’ll tell you which problem you actually have.
In our experience across Boston, a properly applied HeatShield repair on a structurally sound flue typically lasts 8 to 12 years when the chimney is used seasonally. The variables are the condition of the underlying masonry, whether moisture intrusion is controlled, and whether the flue was properly prepared before application. A HeatShield repair over a cracking, shifting chimney won’t last two years. We’ll give you an honest lifespan estimate based on what the camera shows, and we’ll put it in writing.
No. HeatShield products are designed to seal and resurface existing flue liners, not to replace missing sections of liner. If your flue tiles are missing, collapsed, or so deteriorated that structural gaps exist, you need a stainless steel reline, not a coating. We won’t sell you a HeatShield application on a chimney that needs a liner replacement. That’s the kind of call our repair-vs-replace approach exists to make.
CeCure sleeves are designed for round flues. If you have an oval or rectangular flue – common in older Boston masonry chimneys – a CeCure sleeve may not be an option. In those cases, we look at whether a different HeatShield product applies or whether a custom stainless liner is the better path. The camera inspection tells us what shape you’re working with and what will actually fit.
HeatShield chimney cleaning in Boston typically ranges from $250 to $450 for a standard Level 2 inspection and cleaning, depending on flue condition and creosote class. If a full HeatShield Cerfractory or SmokTite application is needed, expect $1,100 to $2,800 depending on flue height and surface area. We give you a written, line-item price before any work starts, and that price doesn’t change unless the camera reveals something we couldn’t see from the top. Call (857) 567-8887 for an exact quote. Estimates are free, and they come in writing.
Book Your HeatShield Service in Boston, MA
If you’re in Boston or anywhere in Greater Boston and your chimney has a HeatShield system that needs attention, call (857) 567-8887. We’ll schedule a Level 2 camera inspection, walk you through the photos, and put a written price in your hands before anything gets applied. Live phone support runs 24 hours a day, 7 days a week. You’ll talk to a person, not a voicemail.
Written by Corrine Halstead, Owner at Level Two Chimney Boston, serving Boston since 2009.