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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After
Before
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AfterHeatShield Flue Liner Replacement: The Flushing Owner’s Guide
A HeatShield flue liner replacement in Flushing typically runs $1,800-$3,400 installed, depending on flue height, diameter, and whether the surrounding terracotta needs removal. We stock HeatShield-compatible liners and carry the full diameter range on our trucks, so most Flushing jobs are completed in a single visit. You’ll know the liner has failed when you see flakes of creosote in the firebox, smell smoke in upstairs rooms, or spot white efflorescence staining the exterior brick, especially after a Queens winter freeze-thaw cycle.
Which HeatShield Models This Applies To
HeatShield manufactures two distinct liner systems, and identifying which one you have determines whether we can sleeve or must do a full tear-out. The Cerfractory Flue Sealant system is a resurfacing product, not a liner itself, applied to existing terracotta flues in good structural shape. The HeatShield ProLiner is a stainless-steel flexible liner, UL-listed to 1777 standards, available in 3-inch to 10-inch diameters. Check your original paperwork for the UL listing tag, or look for a stamped metal band near the top of the chimney with a part number beginning HSP-.
Here’s where owners get tripped up: the ProLiner 316 alloy and the heavier 316Ti alloy are not interchangeable for every application. The 316Ti with titanium stabilization resists chloride corrosion better, which matters in Flushing’s older homes where coal soot residue from pre-conversion heating lingers in the masonry. We source our HeatShield-compatible liners through Olympia Chimney and Copperfield supply houses, not directly from HeatShield. Hearthstone Chimney Co. is an independent service provider with no affiliation to HeatShield Corporation. When an OEM ProLiner is back-ordered, we can install a DuraFlex 316Ti equivalent that meets the same UL 1777 and 1777-CS listings, documented in writing before we start.
Signs Your HeatShield Flue Liner Replacement Is Failing
- Tile fragments or sandy debris in the firebox. This means the original terracotta flue tiles behind your HeatShield coating have spalled from thermal shock. In Flushing’s pre-war colonials near Kissena Park, we’ve seen this after a single hard freeze when the chimney crown cracked and let water seep behind the liner.
- Smoke backing up into the room on startup. A compromised liner loses its smooth draft path. The creosote builds in the gaps, narrowing the flue diameter sometimes by an inch or more before you notice it during normal use.
- White or gray powder on exterior brick faces. That’s efflorescence, mineral salts carried through cracks in the liner and masonry by moisture. It means combustion gases are migrating through the chimney wall, not up it.
- Hot spots or discolored wallboard near the chimney chase. Pyrolysis of nearby framing is a real risk. We documented this in a 1920s Flushing two-family last winter where the HeatShield coating had delaminated above the smoke shelf, letting heat conduct directly into the lath and plaster.
- A sudden creosote odor in summer. When the liner fails, humid air enters the flue and rehydrates old deposits. If you smell your chimney in July, the liner’s no longer sealing.
Replacement Cost & What’s Included
| Scope | Price Range in Flushing |
|---|---|
| ProLiner 316, straight run, 15-25 ft | $1,800 - $2,600 |
| ProLiner 316Ti, offset flue or coal residue present | $2,400 - $3,200 |
| Terracotta removal + full liner replacement | $2,800 - $3,400 |
| Crown repair or rebuild (often needed) | $400 - $950 |
The spread depends on three things: how many flue offsets we navigate, whether the existing terracotta is intact enough to leave in place, and if the chimney top needs a new crown or just a seal. We price every job upfront after a Level-2 camera inspection. You see the photos, you hear the plain-English verdict, and the number on the estimate is the number on the invoice. Every liner replacement carries our 90-Day Done Right Promise in writing. If it’s not right, we come back. No paperwork, no arguing.
DIY or Call Us?
An owner can safely check three things from the ground: whether the chimney cap is present and intact, whether there’s debris visible at the cleanout door, and whether the damper opens fully. Do not attempt to inspect the flue liner yourself. The terracotta you might dislodge can fall unpredictably, and creosote exposure without proper respirator protection is a documented carcinogen risk.
Installing a flexible liner requires dropping a correctly sized tube down a vertical shaft, often through multiple offsets, while avoiding damage to the existing structure. Get the diameter wrong by even a half-inch and you lose draft efficiency or create a creosote trap. We’ve retrieved three homeowner attempts from Flushing chimneys in the past two years alone. The work is not a savings if it has to be done twice. Call (516) 206-6672 and we’ll walk through what you’re seeing before we schedule anything.
FAQs
How long does a HeatShield flue liner last in Flushing?
A properly installed stainless ProLiner should last 15-25 years, but Flushing’s coastal humidity and freeze-thaw cycles can shorten that if the chimney crown fails and lets water sit behind the liner. Annual inspection catches this early. Call (516) 206-6672 for an exact quote - estimates are free.
Can a HeatShield liner be repaired instead of replaced?
The Cerfractory coating can be spot-repaired if the underlying terracotta is sound and the damage is under 10% of the flue surface. A ProLiner with a hole, seam separation, or corrosion pinholing must be replaced; patches on flexible steel do not hold. Call (516) 206-6672 for an exact quote - estimates are free.
How long does the replacement take?
Most single-flue replacements in Flushing are completed in four to six hours, start to finish. We arrive with the liner on the truck, so there’s no second trip for materials. Call (516) 206-6672 for an exact quote - estimates are free.
Do you stock HeatShield liners?
We stock 316 and 316Ti flexible liners in diameters from 4 to 8 inches, which covers the majority of Flushing residential flues. Odd sizes or 10-inch commercial diameters we can have within 48 hours. Call (516) 206-6672 for an exact quote - estimates are free.
A clean flue isn’t a luxury. It’s just the job done right.
Ready to know what you’re dealing with? A live person answers our phones 24 hours a day, every day. Call (516) 206-6672 to schedule a free estimate. We’ll bring the camera, show you exactly what your flue looks like, and give you a price that doesn’t change.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Flushing and nearby areas.