Chimney Liners and Relining in Greater Burlington, Vermont
A liner is the continuous surface inside the chimney that keeps combustion products off the masonry and carries them out. When it fails, the chimney stops being a sealed path: flue gases can reach the structure, the wood framing around it and the rooms next to it. Relining comes up in three situations. A clay tile liner has cracked, spalled or lost its joints, commonly through a chimney fire, water damage or age. A chimney has no liner at all, which is common in old Vermont housing stock. Or a new appliance has gone into a flue that is the wrong size or material for it, which is the usual outcome of putting an efficient stove into a chimney built for an open fireplace. Sizing is the part that gets missed: an oversized flue runs cool, drafts poorly and builds creosote faster.
What a chimney liners visit can cover
- Camera assessment of the existing flue before anything is specified
- Sizing the liner to the appliance instead of to the existing opening
- Stainless liner installation, rigid or flexible as the chimney allows
- Insulation around the liner where clearance and draft require it
- Top plate, cap and termination detail
- Connecting the appliance correctly to the new liner
- Removing or breaking out failed tile where the chimney will not take a liner otherwise
- Documentation of what was installed, for the next technician and the insurer
Reasons people book chimney liners
- A Level 2 inspection found cracked, shifted or missing flue tiles
- You had a chimney fire and the liner has to be assessed or replaced
- The chimney has no liner, which is common in pre-war Vermont houses
- A new wood or pellet stove is going into an existing masonry chimney
- You are converting the heating appliance or the fuel
- Persistent creosote buildup that returns much too quickly
- Smoke or odour reaching a room the chimney passes through
- Water or condensate staining on the chimney inside the house
What happens in chimney liners, in order
- Tell us the appliance, the fuel and what prompted the question: an inspection finding, a new stove or a recurring problem.
- We scan the existing flue, measure it, and establish what the appliance requires as an outlet.
- You get a specification: liner material, diameter, insulation, termination, and what has to happen to the existing flue.
- Installation is carried out and the appliance is connected, with the completed system documented.
What changes the quote for chimney liners?
Prices come from the independent company that visits your property, because the work is quoted and carried out by that company. These are the variables that move the number, so you can read a quote correctly and compare two of them.
How chimney quotes are built, and what makes two comparable →If chimney liners turns out not to be what you need, the full list of chimney and stove services sets out what separates each one, and the chimney problem pages work back to it from the symptom you can see.
- Chimney height and whether the run is straight or has offsets
- Liner diameter, and whether rigid or flexible stainless is required
- Whether insulation is needed to meet clearance or to keep the flue warm
- Whether existing clay tile has to be broken out to make room
- Number of flues being lined in the same stack
- Roof access and staging
- Appliance connection work at the bottom
- Whether crown or cap work is being done at the same time
The five things a liner quote must state
Two liner quotes are only comparable if both state all five. A quote naming only a service and a number is not a specification.
| Specification | Why it matters | What to ask |
|---|---|---|
| Material and alloy grade | Wood, gas and oil by-products attack steel differently; the wrong alloy fails from inside | Which grade, and why that one for my fuel? |
| Diameter | Sized to the appliance outlet, never to the space available; oversized runs cool and builds creosote | What does my appliance require, and does this match it? |
| Insulation | Keeps gases warm for draft, cuts creosote, and can be what meets clearance through framing | Is it insulated, and if not, why not on this chimney? |
| Termination | Top plate, cap and detail; a bad termination undoes the rest | How does it terminate and what cap is included? |
| Existing clay tile | Where there is not room for the correct diameter, tile is broken out to make space | Is tile being removed, or is the liner being sized to fit around it? |
When chimney liners is ordinarily booked
Year round, weather permitting
What can be done in which season in Vermont →Specifying the work: choosing a chimney liner: material, size, insulation and termination sets out the five things a quote has to state before two of them are comparable.
Common questions about questions about chimney liners
What does a chimney liner do?+
Three things: it contains the combustion products so they cannot reach the masonry or the framing, it protects the masonry from acidic and corrosive by-products, and it provides a correctly sized passage so the appliance drafts the way it was designed to.
How do I know if my liner has failed?+
Commonly from a camera scan during a Level 2 inspection. Cracked or displaced tiles, missing mortar between tiles and pieces of tile in the clean-out are the direct evidence. Indirect signs include creosote returning much faster than it should and smoke odour in an adjoining room.
My house is old and has no liner. Is that legal?+
An unlined chimney built before liners were required is broadly not made illegal by a later code, but that is a different question from whether it is safe to keep burning in. Once a system is altered or a new appliance is connected, current requirements apply.
Why does the liner size matter?+
Because draft depends on keeping flue gases warm. A flue much larger than the appliance needs lets those gases cool and slow, which produces weak draft, smoke coming back into the room and creosote forming far faster than it should. Bigger is not safer.
Stainless or clay tile?+
New tile is possible but commonly means rebuilding the chimney around it. Stainless liners can be installed inside an existing chimney, come in the right diameter for the appliance, and can be insulated. For relining an existing masonry chimney, stainless is the normal answer.
What is the difference between rigid and flexible liner?+
Rigid sections are used where the flue runs straight; flexible liner is used where there are offsets it has to negotiate. Flexible is more adaptable, rigid has a smoother interior. The chimney decides which one, not preference.
Does the liner need to be insulated?+
Often. Insulation keeps the flue gases warmer, which improves draft and reduces creosote, and it is sometimes what allows the required clearance to combustibles to be met in a chimney that runs through framing. Also what makes an exterior chimney on a cold Vermont wall usable.
Can a liner be installed if the old tiles are broken?+
Yes, and that is one of the main reasons to install one. Where broken tile leaves too little room for the correct liner diameter, the tile is broken out to make space. A real part of the job and belongs in the scope.
Do I need a liner for a pellet stove?+
A pellet appliance needs a correctly sized vent, and running one into a large open masonry flue is a common mistake. It commonly gets a dedicated liner sized to the appliance outlet, run inside the chimney and terminated correctly.
What about a gas appliance in a masonry chimney?+
Gas venting is cooler and wetter, so an oversized masonry flue lets acidic condensate form inside the chimney. That attacks tile and mortar from within. This is why converting a heating system without addressing the flue causes damage that shows up years later.
How long does a stainless liner last?+
It depends on the grade of stainless, the fuel and how the appliance is run. A liner installed in the right alloy for the fuel, sized correctly and kept clean is a long-term component. One installed in the wrong alloy for the fuel is not.
Will a new liner fix my draft problem?+
It fixes a draft problem caused by an oversized or leaking flue, which is a large share of them. It does not fix a draft problem caused by house pressure, a blocked cap, an undersized appliance opening or a chimney that is too short for its roof. Diagnose first.
Is relining a job I should get more than one opinion on?+
A significant job, so yes. What makes opinions comparable is the specification: liner material and grade, diameter, whether it is insulated, how it terminates and what happens to the existing tile. Two quotes without those details are not comparable.
Does a new liner need its own inspection afterwards?+
The installation should be documented. The appliance connection gets checked as part of it. Keep that documentation: it is what tells the next technician, and any insurer asking, what is inside the chimney.