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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Before
AfterHeatShield Flue Liner Replacement: The New York Owner’s Guide
A HeatShield flue liner replacement in New York typically runs $2,400 to $4,800 installed, depending on whether we’re replacing a single section or relining the full run from appliance to cap. We stock HeatShield-compatible ceramic and stainless liner components, and in most New York homes we can complete the swap in a single day. The way people usually find us: a Level 2 camera inspection shows a cracked segment or spalled surface (where the ceramic has started to flake away), a boiler or furnace technician flagged the liner as a safety issue during annual service, or they smell a faint smoke odor in the house when the heat kicks on for the first cold week in November. If the liner is showing those signs, replacement is the fix.
Which HeatShield Models This Applies To
HeatShield produces two primary liner systems: Cerfractory foam (their spray-on, cast-in-place ceramic lining) and HeatShield Flex stainless liners for gas and oil appliances. The compatibility gotcha that trips up New York homeowners is the sizing difference between single-appliance and multi-flue chimneys. In older rowhomes and brownstones across the boroughs, one chimney often carries both a furnace and a water heater. Installing a liner sized for a furnace alone leaves the water heater venting into dead space, which will fail an inspection. We identify the right replacement by pulling the appliance BTU ratings, measuring the existing flue interior, and matching the diameter against HeatShield’s sizing chart. For most four-to-six-inch runs, an OEM HeatShield component makes sense. If the original liner was installed more than a decade ago and we’re relining anyway, we’ll often recommend a DuraFlex or Gelco equivalent with the same UL listing, because the materials are equivalent but sometimes cost 15 to 20 percent less through our buying network. We’ll show you the price difference in writing before we order anything.
Level Two Chimney New York is an independent service provider. We install and service HeatShield products but are not affiliated with the HeatShield manufacturer.
Signs Your HeatShield Flue Liner Replacement Is Failing
- Smoke odor in the home when the furnace or boiler runs. A crack in the liner lets combustion gases pool where they shouldn’t. In New York winters, the heating system runs enough hours that even a hairline crack will push noticeable odor indoors.
- White or gray flaking inside the flue. This is spalling, where the ceramic surface breaks down from repeated expansion and contraction. New York’s freeze-thaw cycles between January and March accelerate it, especially in uninsulated exterior chimneys.
- Rust streaks or moisture staining on the chimney exterior. Condensation escaping through a failed liner carries soot and water into the masonry, and you’ll see it as dark streaks on brick or the crown.
- An inspection report citing “flue liner deterioration” or a Class III creosote condition. Class III means the buildup is baked on and difficult to remove, but the bigger issue is what it’s doing to the liner surface underneath. If a sweep has to chip it off, the liner is taking damage.
- Difficulty keeping a pilot light lit on a gas appliance. A degraded liner can create poor draft, and the pilot keeps snuffing out because combustion air isn’t moving correctly up the flue.
BeforeAfterReplacement Cost & What’s Included
A HeatShield flue liner replacement in New York runs $2,400 to $4,800 installed. The spread comes down to a few specific things: the liner’s diameter (six-inch runs cost more than four-inch), the total length from appliance to cap, how much old material must be removed before we can install the new liner, and whether the chimney is accessible with a standard roof ladder or needs a lift on a steep brownstone roof. Every quote from us includes the liner, all connection fittings, the top plate and cap, removal and disposal of old materials, and the labor to install it properly. We also include a camera scan after the install and a photo record of the finished flue before we leave. That documentation is part of the job, not an add-on. Clause 4 of the Haven Standard requires a documented photo record on every job, and we’ve worked that way since 2009.
Before you book, check if a masonry chimney specialist has already given you a written estimate. Bring it to us and we’ll give you a free second opinion on it, line by line.
DIY or Call Us?
You can safely do two things: check your records for past inspection reports that mention liner condition, and look at the outside of the chimney for staining or bulging. But a flue liner replacement is not a do-it-yourself job, and it’s not close. The work happens inside a confined flue, requires removing and reinstalling caps and connections at height, and a bad install means combustion gases leaking into your home. Carbon monoxide is odorless and lighter than air, and a liner that looks fine from the top can be compromised mid-run. If you’re in a New York rowhouse with a party wall chimney, you’re also now working against a shared flue system where a wrong connection can affect the unit next door. Between the height, the gas, and the shared-wall issue, this is a call-us job. We’ll bring the camera, show you exactly what’s there, and hand you a written price before anyone starts. Call (551) 213-5548.
FAQs
A HeatShield liner installed correctly in a New York chimney typically lasts 15 to 25 years, though exterior chimneys subject to our freeze-thaw cycles trend toward the lower end of that range. HeatShield’s own warranty on Cerfractory liners covers 10 to 20 years depending on the application, but performance beyond year 20 depends heavily on whether the chimney cap has kept water out and whether the liner was swept regularly. We’ve pulled HeatShield liners out of Queens brownstones after 30 years and found them serviceable, and we’ve replaced liners in Staten Island homes that failed at year 12 because the crown had cracked and water was getting in from above. The liner is one part of a system, and water is what shortens its life. Call (551) 213-5548 if you want us to bring the camera down and tell you exactly what you have.
In most cases, no. A small hairline crack in a single spot can sometimes be sealed with a patch material rated for the appliance and flue temperature, but that’s a temporary fix and we won’t recommend it on a liner that’s already spalling in multiple areas or showing water damage. Once the ceramic surface has begun to break down across a section, patching is like putting a bandage on a rusted fender in a New York winter: you’ll be back in a year, and the problem will be bigger. We’ll recommend replacement when the camera shows the liner surface is compromised, and we’ll show you the photos that support that recommendation before we ask for a decision.
Most HeatShield flue liner replacements in New York take one full day from setup to final camera scan. A straight single-appliance liner in a single-family home is usually four to six hours. A multi-flue brownstone chimney where we’re relining two separate runs can take two days, because the second liner has to be threaded carefully past the first and we won’t rush a pass that involves working at height. We’ll give you a time estimate in writing with the quote, and we mean that number.
We keep common HeatShield-compatible liner sizes (four-inch, five-inch, and six-inch) on the truck in both stainless flex and ceramic foam application kits, along with top plates, rain caps, and connectors. For unusual diameters or multi-story brownstone runs, we order from our supplier network and schedule the install within a few days. If you’re replacing a liner on a less common size or in a Flushing co-op building with a shared chimney, the order time is part of the quote you’ll get in writing. Call (551) 213-5548 and Corrine Halstead or one of our technicians will come out and map the flue before anything is ordered.
Contact
If your HeatShield liner shows signs of failure, or if an inspection report flagged a problem, call (551) 213-5548. We’ll schedule a time, put a camera down the flue, and hand you a written price and a photo record before any work begins. Level Two Chimney New York serves all five boroughs, and our phone is answered by a live person, any hour, every day.
Written by Corrine Halstead, Owner, Level Two Chimney New York at Level Two Chimney New York, serving New York and nearby areas.