For relining a chimney, stainless steel is usually the better choice: it’s continuous with no joints to crack, can be sized precisely to your appliance, and installs into an existing chimney. Clay tile is durable and original to many older chimneys, but it cracks over time and is hard to repair in place. Here’s the full comparison.
Head to head
| Factor | Stainless steel | Clay tile |
|---|---|---|
| Durability | Very durable; continuous, no joints | Durable but cracks with heat cycling and age |
| Cracking after a chimney fire | Highly resistant | Commonly cracks — a leading reason for relining |
| Sizing to appliance | Sized precisely to the stove or insert | Fixed size built into the chimney |
| Installation | Installs into an existing chimney (relining) | Built in during original construction; hard to retrofit |
| Repairability | Replaceable as a unit | Difficult to repair in place once cracked |
| Best use | Relining, new stoves/inserts, post-fire repair | Original masonry chimneys in sound condition |
Clay tile liners
Clay tile is the traditional liner in most older masonry chimneys, installed as stacked sections when the chimney was built. It handles heat well and lasts for decades when undisturbed. Its weaknesses are the mortar joints between tiles, which can crack, and its vulnerability to the sudden heat of a chimney fire, which often splits the tiles. Once cracked, clay tile is very hard to repair in place — which is usually when relining with steel enters the picture.
Stainless steel liners
A stainless steel liner is a continuous metal flue installed down the inside of the chimney. Because it has no joints, there’s nothing to crack, and it can be sized exactly to your fireplace, stove, or insert for proper draft. It’s the standard solution for relining a chimney with a cracked or missing liner, for connecting a modern appliance, and for restoring a chimney after a fire. Properly installed and sized, it gives a safe, smooth path for smoke and gases.
Which should you choose?
The verdict: if your chimney already has sound clay tile, there’s no need to replace it — keep it and inspect it yearly. But if you’re relining because the liner is cracked, missing, or you’re installing a new appliance, stainless steel is almost always the right call for its durability, correct sizing, and fire resistance. We’ll confirm which situation you’re in with a camera inspection and recommend the liner that actually fits your chimney and appliance.
Frequently asked questions
Is a stainless steel liner better than clay tile?
For relining, usually yes. Stainless steel is continuous with no joints to crack, resists the heat of a chimney fire, and can be sized to your appliance. Clay tile is fine when it’s already in sound condition, but it cracks over time and is hard to repair in place.
When do I need to reline my chimney?
When an inspection finds cracked flue tiles (often after a chimney fire), when there’s no liner at all, or when you install a new stove or insert that needs a specific liner size. A Level 2 camera inspection reveals the liner’s true condition.
Can a cracked clay tile liner be repaired?
It’s difficult. Because the tiles are built into the chimney, repairing them in place is impractical in most cases. The usual solution is to reline the chimney with a continuous stainless steel liner rather than trying to patch the clay.
Why does a liner need to be sized to my appliance?
An oversized liner lets gases cool and condense, causing poor draft and more creosote; an undersized one can’t vent properly. Stainless steel liners are sized to the appliance precisely, which is a big reason they’re used when connecting modern stoves and inserts.
Does a chimney fire damage the liner?
Often, yes — the sudden intense heat commonly cracks clay tile liners, sometimes invisibly. That’s why you should never use a chimney again after a chimney fire until a Level 2 inspection checks the liner, and why relining with steel is a frequent post-fire repair.
How long does a stainless steel liner last?
A quality stainless liner, correctly installed and maintained, can last many years, and better grades carry long warranties. Burning dry wood and keeping up with sweeping and inspection helps any liner last longer.
Will a new liner improve my fireplace’s draft?
Frequently, yes. A correctly sized, smooth, insulated liner gives smoke a clean path out, which improves draw and reduces smoke spilling into the room. Draft problems sometimes trace directly to a missing or wrongly sized liner.
How do I know which liner my chimney has?
A camera inspection shows it directly — whether you have stacked clay tiles, a metal liner, or no liner at all, and what condition it’s in. We can tell you exactly what’s there and whether it’s safe before recommending anything.
Relining your chimney? Get the right liner
We’ll inspect what’s there and recommend the liner that fits your chimney and appliance. 7 days a week.
Related
Published November 10, 2026 · Written and reviewed by Joseph Ino, Founder & Master Chimney Technician, Chimney Sweep Squad