Cracked clay tile, an unlined chimney, or a new appliance the old flue was never sized for. We reline with listed stainless systems, sized to what you are actually burning.
Relining means fitting a new liner inside an existing chimney. The liner is the barrier that keeps heat and combustion gases inside the flue and away from the framing packed around the masonry.
Every masonry chimney is supposed to have one. Older ones were built with clay tile, stacked in sections up the inside of the stack. Clay is good at the job until it cracks, and it cracks for ordinary reasons: heat cycling, a chimney fire, movement in the structure, water sitting in the joints for decades.
Once it does, the chimney has a gap in its only barrier. Homeowners find that hard to believe, because the fireplace usually carries on drafting and looking normal. A cracked liner does not announce itself. It just stops protecting the timber pressed up against the other side of the brick.
Some houses never had a liner at all. Anything built before clay tile became standard practice was often just brick, and plenty of those chimneys are still in daily use across Los Angeles.
Cracks, gaps opening at the joints, tiles that have shifted out of line, or sections spalling away. By a wide margin, the most common reason we get called.
Even a small one. Creosote burns hot enough to crack tile and warp metal, and the damage is inside where nobody sees it. The flue needs evaluating before the next fire is lit.
A wood insert, a pellet stove or a gas unit needs a flue sized for it. A chimney built for an open fireplace is usually far too large, which kills the draft and lets condensation form.
Common in older housing stock. An unlined masonry flue has brick between the fire and the framing, and mortar joints that gases work through over time.
Two documents govern this work. NFPA 211 is the installation standard for chimneys and solid fuel appliances. UL 1777 is the listing standard that relining systems are tested against. Between them they decide what counts as an acceptable liner and how it has to go in.
The part worth knowing is that the criteria are physical, not a matter of opinion. A flue with cracks, offset joints or missing mortar does not meet the integrity requirement even when the fireplace still appears to work normally. Drafting fine is not the test.
Adopted code editions and permitting vary between jurisdictions across Los Angeles County. We confirm what applies at your address before quoting.
Alloy choice is not marketing. Wood smoke is abrasive and gas condensate is chemically aggressive, and they wear metal in different ways.
The usual choice for open fireplaces and wood stoves. Heavier flex and rigid grades hold up to being brushed on every sweep, which matters when the liner will be cleaned annually for decades.
Best for: wood fireplaces, wood stoves, wood inserts.
Built for corrosion resistance. Condensate is the enemy here, not abrasion. Higher efficiency gas appliances run cooler exhaust, which means more moisture sitting inside the liner.
Best for: gas appliances, gas inserts, oil-fired equipment.
An insulation blanket or poured mix around the liner. Improves draft, reduces creosote by keeping flue temperature up, and is frequently what the listing requires to achieve its clearance rating.
Best for: exterior chimneys, oversized flues, most solid fuel installs.
A cement-based liner formed inside the existing chimney. Heavier work than a stainless drop-in, and it can add structural strength to a stack that has deteriorated.
Best for: badly deteriorated masonry, irregular flues.
None of these confirm it on their own. Each is a reason to get a camera down the flue.
Nobody can assess a liner from the firebox. The damage is up inside the flue, so that is where we look before anyone talks about cost.
We run a camera the full height of the flue and record what is there. Cracked tile, offset joints, missing mortar, or a liner that was never fitted.
You see the inside of your own chimney, with the problem pointed out on screen. Relining is expensive enough that you should not have to take our word for it.
Measured against the appliance it will serve, then matched to the right alloy and insulation for the fuel and the chimney.
The liner goes down the flue, gets connected at the appliance and terminated at the top. On some chimneys the old clay has to come out first, which we do carefully so the stack is not damaged.
A second camera pass to confirm the install, plus the listing documents for the system that went in. Keep them. They matter when you sell.
Same flue, camera in the same position. The difference a liner makes to what is going on inside the chimney.
A camera inspection is the only reliable way. Cracked tile sits well up inside the flue where you cannot see it from the firebox, and a damaged liner often drafts normally right up until something goes wrong.
Sometimes. Isolated defects or a couple of failed joints can be candidates for resurfacing or joint repair. Widespread cracking, offset tiles, or damage from a chimney fire generally point to relining. What we recommend depends on what the camera shows.
A properly sized and insulated stainless liner typically lasts a long time, and correct installation matters more than the brochure. Sizing, insulation and workmanship are the biggest factors. Thin gauge material fitted badly can fail far sooner.
Often yes. Jurisdictions that have adopted the residential code generally require permits for chimney relining. Requirements differ across Los Angeles County, so we check what applies at your address before starting.
Not always. Many relines drop straight down the existing flue. When the clay is badly collapsed, or the new liner needs the space, the tile is removed first. Careful work, since the stack and any adjoining flues have to come through it intact.
Frequently, particularly when the flue is oversized for what it is serving. A correctly sized insulated liner holds flue temperature better and drafts more consistently. We would want to rule out a blockage or a damper fault first.
It depends on the height of the chimney, the alloy, whether insulation is required, and whether the old tile has to be removed. Those variables move the number a long way. It is why we inspect before quoting instead of guessing at a figure on the phone.
A camera inspection tells you whether the liner is sound, and you see the footage yourself. Nothing gets quoted before that.
