Chimney liner repair for clay flues with open joints and cracked tiles
Chimney liner repair closes the gaps in an existing clay tile flue so heat and exhaust stay inside it. Our Union Street office in New Bedford covers this repair throughout New Bedford, Dartmouth, Acushnet and Fairhaven. Each job begins with a camera run down the flue, because only the footage shows whether the tiles can be mended in place or the flue is past repair.
What South Coast houses ask of their flues
Liner damage around here has less to do with the sea than with what the chimneys were built for and what has burned in them since.
Flues older than the fuel they carry
Census estimates date 52.1% of New Bedford’s homes to 1939 or earlier. Many of those flues were laid for coal or wood and now vent a gas or oil boiler, a duty their builders never planned for.
Oil heat and acidic moisture
About 42% of Acushnet homes and 30% of Dartmouth homes heat with fuel oil. Cool oil exhaust condenses inside an oversized tile flue, and that acidic moisture slowly eats the mortar between the tile sections.
Interior chimneys in raised-basement houses
New Bedford’s cottages and houses were mostly built with raised basements and interior chimneys. A flue that leaks there leaks into the middle of the house, past floors and framing, rather than out into the yard.
Housing ages, heating fuels and storm history come from the sourced notes on our community pages: New Bedford, Dartmouth, Fairhaven, Acushnet.
How a liner repair visit runs
We do not pick a repair method until we have seen the full length of the flue on camera and talked it through with you.
Sweep so the tile shows
Soot, scale or creosote is cleared first. A camera pointed at a dirty flue records deposits, not the joints and tile faces that decide the repair.
Film the whole run
The camera travels from the top or the cleanout to the other end, and we log the depth of every open joint, crack, offset tile or missing piece.
Lay out the options
Using the footage, we explain whether the damage is confined enough to mend in place or spread so widely that a new liner is the honest answer. You decide.
Rebuild the joints
Where repair is agreed, a heat-rated material made for flue joints closes the gaps and voids, applied by a method that suits the appliance and fuel on that flue.
Film it again
A second camera pass after the work lets you compare before and after on screen, so you can see each repaired joint for yourself.
No single repair product suits every flue; the fuel, the appliance and the tile size narrow the choice.
Where a chimney fire split the tiles, the creosote that fed it gets dealt with too, or the damage tends to come back.
Clues that a tile flue has opened up
Most liner damage is invisible from the room. These are the hints that usually prompt a call.
- Shards at the baseBits of orange-brown clay in the cleanout or on the smoke shelf come from tiles breaking somewhere overhead.
- A recent chimney fireA roaring sound, puffy flakes of creosote on the roof or in the yard, or a hot smell from the flue all point to a fire that may have cracked tiles.
- Exhaust where it does not belongA smell of smoke or flue gas in a closet, attic or room beside the chimney can mean the tile run has a gap.
- Damp patches on plasterBrown staining on the wall around an interior chimney can be condensate working out through open joints.
- A written reportA sweep’s notes or a home-sale inspection that mentions missing mortar or cracked tiles somewhere in the flue.
Repair the tiles, or reline the flue?
Liner repair suits a tile flue that is mostly sound with damage in a few places. Damage along the full height, or a flue that is the wrong size for its appliance, calls for a new liner instead.
Ask for liner repair when
- Several mortar joints are eroded or open
- Cracking stays within one stretch of tile
- A minor chimney fire left limited damage
- The flue will keep serving the same appliance
Ask about a different page when
- Tiles cracked or missing along most of the flue: Chimney Liner Installation
- Nobody has filmed the flue yet: Chimney Camera Inspection
- Glazed deposits hide the tile faces: Creosote Removal
What decides the scope of a liner repair
Two flues with the same complaint can need very different amounts of work. These are the factors we weigh after the camera run.
- Number of bad joints
- A handful of open joints is a modest job. Gaps at most joints usually tip the decision toward relining rather than repair.
- Depth of the damage
- A crack near the top or bottom is easy to reach. One halfway down a three-story flue takes more setup and a method that works at a distance.
- Deposits to remove first
- Repair material will not bond to clay coated in thick soot or creosote glaze, so that layer is cleared first.
- Bends and offsets
- Flues that jog around framing or a neighboring flue limit which repair methods can reach the broken tiles.
- The fuel and appliance
- Material that suits a wood fireplace may not suit a gas boiler flue, so the appliance at the bottom shapes the choice.
No price list on this site, on purpose. Two chimneys that sound the same over the phone rarely are. Once someone from the New Bedford office has looked at yours, you get the scope in writing and decide from there.
More frames of this kind of work
Taken on Chimney Champ’s jobs and kept in the company photo library that all our locations draw on. The library holds no job addresses, so no frame here is tied to a street or a town.
Questions about repairing a clay flue
Can I keep using a flue with a cracked tile?
It is safer not to until the flue has been looked at. A crack lets heat reach the surrounding brick and possibly wood framing, and lets exhaust escape. How serious it is depends on the size and position of the crack and what the flue serves, which the camera footage shows.
Why not just reline every damaged flue?
Because some damage is limited enough that repair is a sound fix and relining would be more work than the flue needs. When the damage is widespread, though, a repair would not hold for long, and we say so with the footage in front of you.
What breaks clay flue tiles in the first place?
Sudden heat is the main culprit, most often from a chimney fire. Settling of the stack opens joints, water entering at the top freezes in the clay, and years of acidic condensate from oil or gas appliances wash out the mortar between sections.
Will I get to see the inside of my flue?
Yes. You can watch the camera live or look at the recording with us afterwards. We want you to see where each crack or gap sits before you choose between repair and a new liner, and again once the repair is done.
Is a permit needed for liner repair?
That is for the local building official to decide, and the answer can differ between a repair and a full reline. In New Bedford it is the Department of Inspectional Services on William Street; Dartmouth, Acushnet and Fairhaven each have their own building department. We describe the work clearly so the question can be put to them.
Booking, hours and general chimney questions are on the main FAQ; how a visit runs is on what to expect.
Often looked at alongside
- Chimney Liner InstallationRunning a stainless liner down an existing flue, sized for the boiler, water heater, stove or insert it serves.
- Chimney Camera InspectionA video scan of the flue lining from bottom to top, with stills of cracks, gaps and blockages to show you.
- Creosote RemovalBreaking down and clearing crusted or glazed creosote that a routine sweep leaves stuck to the flue.
- Level 2 Chimney InspectionThe closer inspection for a sale, a chimney fire or storm, or a change of heating appliance, fuel or liner.
Background reading
- 7 minOil Heat and the Chimney: Why Oil Flues Need Regular AttentionOil soot and moisture wear flues from the inside. What to watch for, and what changes when the oil boiler is replaced.
- 7 minChimneys on Old Capes and Federal Houses Around New BedfordCenter chimneys, end chimneys, lime mortar and no liners: how to look after the oldest chimneys on the South Coast.
- MapThe four places we coverNew Bedford · Dartmouth · Fairhaven · Acushnet, all from one office downtown.