Chimney repair
across Offaly
The highest turf use of any county in Ireland, and flues that show it. Tar removal, relining, rebuilds. Free CCTV survey, insurance claims handled start to finish.
The turf capital of Ireland, and the flues that come with it
Search for a chimney man in Offaly and you will be offered the midlands. One competitor covers Athlone, Tullamore, Mullingar and Portlaoise from a single page; another has a page called, literally, "The Midlands". They are roofing companies, and none of them has a page about Offaly.
That matters here more than in any other county, because Offaly is not a generic midlands county. It is the single most distinctive county on this site for this trade, and one number says why.
27% of Offaly households heat mainly with peat, including turf. That is the highest rate of any county in the State. The national figure is 3.7%, so Offaly burns turf at more than seven times the national rate. Roscommon is next at 20.4%, then Galway at 17.6%.
This is Bord na Móna country. The bogs are the landscape and, until very recently, the economy, and the county sits inside the EU Just Transition Fund area for exactly that reason.
For a chimney, that one statistic decides almost everything. Turf tars a flue faster than timber does, and tar is what burns in a chimney fire. So on an Offaly page the useful content is not a general list of chimney problems. It is what turf specifically does, how fast, and what to do about it.
The rest of the county reads more ordinarily: 42.3% on oil, close to the national 39%, and housing stock up 4% from 30,740 to 31,851 between 2016 and 2022, a shade under the national 5%.
Straight about distance: the van works out of Clonegall, Co. Carlow, so Tullamore is around an hour and a half and Edenderry, on the Kildare side, is closer. For a rebuild, a reline or an insurance job across several days that is workable. For a small call-out it is not, and you will be told so on the phone.
What turf actually does to a flue
Turf is not bad for a chimney. It is simply harder work for one, for two reasons that compound, and at 27% of households it is worth setting out properly rather than in passing.
It carries moisture. Even well saved turf holds considerably more water than kiln-dried timber. Every bit of that water has to be boiled off using heat that would otherwise have gone up the flue as temperature. A cooler flue is one in which combustion gases reach their condensation point lower down, inside the chimney rather than above it.
It burns at a lower flame temperature. Turf gives a long, steady, forgiving output rather than a hot fast one, which is exactly why people prefer it. The consequence upstairs is that the gases cool sooner on the way up and deposit tar higher in the flue than timber would.
And the habit makes it worse. A turf fire is very often banked down and left in overnight. Smouldering is the tar-producing condition: low temperature, low airflow, incomplete combustion. The practice that keeps the kitchen warm until morning is the same practice that loads the flue.
What that produces is not soot. Most people expect a loose black powder that a brush takes out. Heavy turf tar is a glossy, hard, almost varnished coating on the flue wall, sometimes running in ridges, and once it has hardened to that state a brush will not shift it.
So the honest advice in Offaly is not to stop burning turf. It is a shorter sweeping interval than the once-a-year figure quoted at everybody, because that figure assumes seasoned timber. Twice through a heavy season is not excessive here, and a camera tells you what a calendar cannot.
The most dangerous moment is the switch away from turf
Turf burning is falling nationally: around 90,000 households in 2011, 79,000 in 2016 and roughly 68,000 in 2022. In the county where it is highest, that decline is felt hardest, and Offaly households are moving to timber, to oil, or to a stove where an open fire used to be.
There is a specific hazard in that transition, and almost nobody mentions it.
The flue size requirement does not change. Under TGD J Table 2 a closed appliance up to 20 kW needs at least 150 mm internal diameter for timber and for peat alike. So nothing about the chimney has to be different on paper.
The risk does change. Well seasoned timber burns considerably hotter than turf. Run a hot timber fire up a flue carrying years of accumulated turf tar and you have the textbook set-up for a chimney fire: fuel on the flue wall, and finally enough heat to ignite it.
The household doing everything right, moving to a cleaner and hotter-burning fuel, is precisely the household at risk. It is a genuinely counter-intuitive result and it is why this section exists.
The fix is boring and cheap. Sweep and camera first, change fuel second. An hour of work before the first hot fire, rather than an insurance claim after it.
Why Offaly chimneys fail
Tar accumulation, first and by a distance
Covered above, and in this county it is the finding rather than a finding. At 27% of households on peat against 3.7% nationally, the base rate of glazed flues here is unlike anywhere else on this site. Tar is the fuel for a chimney fire, and a chimney fire cracks flue tiles and parge coats even where the house itself comes through untouched.
Sulphate attack, and why stacks lean
Burning turf and coal produces sulphates. In an unlined flue those gases soak into the mortar joints and over years react with the cement and expand it. The joints swell, the stack grows unevenly and it starts to lean, almost always away from the prevailing wind because that face stays wet longest. It does not stop and it cannot be pointed out of existence.
Oversize flues serving small stoves
A great many older Offaly houses had a stove dropped into a fireplace built for an open turf fire. Those flues are enormous by modern standards, because an open turf fire needed the volume to draw at all. The stove cannot fill it, so the gases slow, cool and condense on the way up instead of drawing cleanly. That condensate is acidic and it goes into the masonry. An oversize flue is a genuine safety problem, not merely an inefficiency.
Flaunching, the most common single failure
Flaunching is the sloped mortar cap that beds the pots and sheds water off the top of the stack. It is the most exposed mortar on the building and it goes first everywhere. When it cracks, rain runs down inside the masonry instead of off the top, and the first sign indoors is a damp patch high on a chimney breast after heavy rain.
Mortar fillets instead of lead flashing
Where the stack passes through the slates there should be lead soakers and a stepped flashing dressed into the mortar joints. Plenty of older Offaly houses have a mortar fillet instead, and a mortar fillet cracks within a few winters. Water then tracks into the roof timbers, which is how a chimney problem quietly becomes a roof problem.
Ventilation in the newer housing
Offaly stock grew 4% between 2016 and 2022, a little under the national rate, and every new house is airtight. TGD J 4.2.1 requires 6,500 mm² of permanent free vent area for any non-room-sealed solid fuel appliance, plus 550 mm² per kilowatt above 5 kW, so an 8 kW stove needs 8,150 mm². There is no under-5kW exemption in Ireland; that is UK Approved Document J. The same thing happens to an older house after new windows go in.
799 dwellings stood empty across two censuses
Census 2022 recorded 2,491 vacant dwellings in Offaly, down 6% from 2,640 in 2016. Underneath that, 799 dwellings were recorded vacant in 2016 and again in 2022, and a good number of those are now being bought and renovated.
A flue that has not been lit in six years is a different proposition from one in daily use.
Jackdaws. An unused pot is an attractive nest site and a nest can fill a metre or more of flue. It is the single most common cause of a smoke-back on a first fire in a renovated house.
Nothing is documented. No sweeping history, no record of the flue's condition, nothing an insurer can be shown later. That is an hour's work to fix at the start.
Cold chimneys deteriorate faster. A stack unheated for six winters has had no warm flue drying it from the inside, and nobody was in the house to notice damp appearing on a bedroom ceiling.
There is an Offaly-specific twist worth adding. If the previous household burned turf, the tar is still up there waiting, and the new owners are statistically likely to light timber. That is the fuel-switch hazard above, arriving by a different route.
What chimney damage looks like from inside the house
Almost nobody rings about a chimney. They ring about something else that turns out to be the chimney.
- →The fire is harder to light than it used to be. The classic turf-country symptom: tar narrowing the flue. It comes on gradually enough that people adapt rather than notice.
- →A sharp, acrid smell when the fire is out. Tar deposits give off a distinctive creosote smell, strongest in damp or humid weather.
- →A damp patch high on the chimney breast. Usually flaunching or flashing. It appears after heavy rain and fades between, which is why people live with it for a year.
- →Debris in the grate. Mortar and brick fragments coming down mean the inside of the flue is breaking up.
- →Twigs in the grate in spring. A jackdaw nest above, and the classic finding in a house that stood empty.
- →The stack looks off plumb. Sight it against the gable on a clear day. If it is leaning, stop using the fire.
- →A roaring sound with no obvious cause. That is a chimney fire in progress. Ring 999, then have the flue inspected before it is used again.
A plain word on smoke alarms while we are here. Census 2022 recorded 1,364 Offaly homes with no smoke alarm at all. In the county that burns the most solid fuel in Ireland, that is the cheapest thing on this page to put right, and it is not a job that needs us.
If you are unsure what you are looking at, the photo-based damage assessment gives a straight answer before anybody visits.
Every type of chimney repair, done properly
Tar removal. Listed first because in this county it is the job most often needed. Hardened tar does not come off with a brush. It needs rotary work and sometimes chemical treatment first, and on a badly loaded flue relining is genuinely cheaper than repeated attempts to clean it.
Relining. A stainless liner sized for the appliance, fed from the top, connected at the stove and sealed at the pot. Under TGD J Table 2 a closed appliance up to 20 kW burning timber, peat or bituminous coal needs at least 150 mm internal diameter; only smokeless fuel or wood pellets may drop to 125 mm. Turf sits on the 150 mm side of that line.
Partial rebuild. The stack taken down to sound masonry above roof level and rebuilt. On a sulphate-damaged stack this is usually the right call, because the damage concentrates in the exposed head.
Full rebuild. Down to the roofline and back up, with new flaunching, new pots and new lead.
Repointing in the correct mortar. Too hard a mix traps moisture behind a rigid face, and the next frost pushes the brick or stone apart rather than the joint. The joint is meant to be the sacrificial part.
Flaunching renewal. The mortar cap cut out and recast to the correct fall, pots rebedded. Cheap, quick, and it prevents the expensive job.
Lead flashing. Proper code lead, stepped and dressed into the joints with soakers under the slates. Not a mortar fillet.
Ventilation corrections. Cutting in a permanent vent to the 6,500 mm² minimum, or more where the output demands it.
Fire and storm damage. Assessed, documented and rebuilt, with the insurance handled in parallel. See insurance and fire damage.
More detail on the main chimney repairs page and the lining and cleaning page.
What chimney repair costs in Offaly
Real ranges, including VAT, labour, materials, scaffold or hoist where needed, waste away and the certificate.
| Work | Typical range |
|---|---|
| CCTV survey | Free with any repair |
| Flaunching renewal | €450 – €1,100 |
| Lead flashing | €600 – €1,400 |
| Relining | €1,400 – €2,800 |
| Partial rebuild, above roof level | €2,000 – €4,500 |
| Full rebuild, single stack | €3,500 – €8,000 |
| Full rebuild, double stack | €8,000 – €14,000 |
| Insurance excess on an approved claim | €200 – €300 |
A bungalow outside Kilcormac, Ferbane or Shinrone with a yard to set up in sits at the bottom of its band. A tall stack in the middle of Tullamore or Birr with no rear access, needing scaffold and a licence from Offaly County Council to stand it on a public footpath, sits at the top. Nobody can tell you which you have over the phone, which is why the survey is free and the quote follows in writing.
Indicative only. An exact figure follows the survey, in writing, before any work starts.
We handle the Offaly claim from start to finish
Storm damage and chimney fires are covered by most Irish household policies. Gradual deterioration is not. That single distinction decides most claims, and it gets decided by how the damage is documented rather than by what happened on the roof.
In the county that burns the most turf in Ireland, that distinction is sharper than anywhere. A chimney fire is a covered event. The tar that fed it accumulated gradually. Documenting the fire damage properly, while it is fresh and before anything is touched, is what keeps a claim on the right side of the line.
In practice that means CCTV footage of the flue, photographs of the stack before anything is disturbed, a written report describing the mechanism of failure, and an itemised costing set out the way loss adjusters expect. Then Johnny deals with the adjuster directly, so you are not the one explaining flue liners over the phone to somebody in an office.
If you have had a chimney fire, or think you might have, do not use the fire or stove again until the flue has been inspected. Many chimney fires burn inside the flue without visible flames and leave cracked liners and damaged masonry behind them, so the house looks fine and the chimney is not.
On an approved claim you pay your excess, typically €200 – €300, and nothing else.
One thing worth saying plainly, because it gets repeated as fact and it is not: no Irish insurer makes annual sweeping a condition of cover. Sweeping is worth doing and a record of it helps a claim, but nobody voids a policy over a missed year.
Full detail on insurance and fire damage work, and on how a claim actually runs.
What needs doing now, and what can wait until spring
| Finding | How urgent |
|---|---|
| After a chimney fire | Do not relight until inspected |
| Glazed tar visible on camera | Before the next heating season |
| About to switch from turf to timber | Sweep and camera before the change |
| Leaning stack | Stop using the fire. Same week. |
| First fire in a house that stood empty | Survey before lighting, not after |
| Mortar fillet where the lead should be | Before winter |
| Cracked flaunching, no damp yet | This year, not this week |
| Pointing tired but sound | Monitor. Often several years left |
Rows two and three are the ones that belong to this county specifically, and they are the two most likely to be skipped, because in both cases nothing looks wrong from the room.
Every corner of the county
Offaly has three Eircode routing keys for a fairly small county, and that is not an accident. Tullamore, Birr and Edenderry face in three different directions, and Edenderry is closer to Kildare than it is to Birr.
| Key | Post town |
|---|---|
| R35 | Tullamore |
| R42 | Birr |
| R45 | Edenderry |
Portarlington straddles the boundary with Laois, sitting on the River Barrow with part of the town in each county, so two neighbours on the same street can have addresses in different counties. If that is you, the Laois page is worth a look as well.
Mention the town and what you burn when you ring. In this county the second one tells us more than the first, because it decides what we expect to find on the camera before we arrive.
One tradesman, not a call centre
Johnny Roberts runs J.Roberts Solid Fuel Services on his own out of Clonegall, Co. Carlow. Ring the number and you get him. The person who surveys your chimney is the person who does the work.
Every top result for chimney work in this part of the country is a roofing company, and most of them treat the midlands as one place. A roofer sees the top of a roof; here the flue is the whole trade. In a county with this much tar in its chimneys, that difference is not academic.
There is no statutory register for solid fuel work in Ireland, so what is actually checkable is the insurance, the work itself and the certificate. All three are available to see.
Chimney repair in Offaly. FAQ
Is turf really worse for a chimney than timber?
It is harder work for a flue, and Offaly is the county where that matters most. Census 2022 recorded 27% of Offaly households heating mainly with peat including turf. That is the highest rate of any county in the State and more than seven times the national figure of 3.7%. Turf carries moisture and burns at a lower flame temperature than seasoned hardwood, so the gases cool sooner on the way up and lay down tar higher in the flue. Tar is what burns in a chimney fire. None of that is an argument against burning turf. It is an argument for a shorter sweeping interval than a timber-burning house needs, and for a camera down the flue often enough to know what is actually up there.
How often should an Offaly turf-burning chimney be swept?
More often than the once-a-year figure that gets quoted at everybody, because that figure assumes seasoned timber. A flue carrying turf, and particularly one where the fire gets banked down and left in overnight, loads faster than that. Twice through a heavy season is not excessive here. The honest answer is that a camera tells you rather than a calendar: some flues in this county look fine after a winter and some are glazed. What matters is knowing which one you have before it decides for you.
What does tar in a flue actually look like on camera?
Not like soot. People expect a loose black powder that a brush sweeps out. Heavy turf tar shows as a glossy, hard, almost varnished coating on the flue wall, sometimes running in ridges. Once it has hardened to that state a brush will not shift it. It needs rotary work and sometimes a chemical treatment first, and on a badly loaded flue relining is genuinely cheaper than repeated attempts to clean it. The other thing the camera finds is where it has cracked the parge coat underneath.
How much does a chimney rebuild cost in Offaly?
A partial rebuild above roof level typically runs €2,000 to €4,500. A single stack from the roofline is €3,500 to €8,000. A double stack is €8,000 to €14,000. Relining is €1,400 to €2,800. The survey is free and nothing is quoted until a camera has been down the flue. A bungalow outside Kilcormac or Ferbane with a yard to work from sits at the bottom of its band; a tall stack in the middle of Tullamore or Birr with no rear access sits at the top, because of scaffold.
My chimney is leaning. Is that urgent?
Treat it as urgent. It is usually sulphate attack, where flue gases have soaked into the mortar over years and expanded it, and it almost always leans away from the prevailing wind because that face stays wet longest. It does not correct itself and it does not stop. Stop using the fire and ring somebody the same week. In a county burning this much turf and coal in unlined flues, it is the most common structural finding on older houses.
We are moving off turf. Does that change the chimney?
Not the size of it. Under TGD J Table 2 a closed appliance up to 20 kW needs at least 150 mm internal diameter for timber and for peat alike. What changes is the risk on the first few fires. Well seasoned timber burns hotter than turf, and a hotter fire in a flue carrying years of turf tar is the standard set-up for a chimney fire. This county is changing fuel faster than most, so the sensible order is sweep and camera first, change fuel second. It is an hour of work and it is the difference between a good decision and an expensive one.
The house was empty for years before we bought it. What should we check?
The flue, before you light anything. Census 2022 recorded 2,491 vacant dwellings in Offaly and 799 of those were recorded vacant in the 2016 census as well, so buying a long-empty house here is common. A dormant flue collects jackdaw nests, and a nest is the single most common cause of a smoke-back on a first fire. There is also no sweeping record and nothing documented for an insurer. An hour with a camera before the first fire is the cheapest part of the whole purchase.
What does the free survey involve?
About an hour. A look at the stack from the roof, a CCTV camera down the flue, a check of the flaunching, the pots and the lead flashing where the stack meets the slates, and a look at the fireplace and any damp staining inside. You get told what is wrong, what needs doing now and what can safely wait until spring. No charge, and the footage is yours to keep whether or not you use us.
Why is there a damp patch on the chimney breast upstairs?
Usually one of three things. Failed flaunching, the mortar cap on top of the stack, which cracks and lets water straight down through the masonry. Failed lead flashing where the stack passes through the roof, and plenty of older Offaly houses have a mortar fillet there instead of proper lead. Or an unlined flue, where condensing gases carry moisture into the masonry, which is the one that turf makes more likely. A survey separates them quickly and they need completely different fixes.
Will insurance cover the damage?
It depends on the mechanism rather than the appearance. Most Irish household policies cover storm damage and chimney fires and exclude gradual deterioration, and that distinction decides most claims. It matters more in a turf county than anywhere, because a chimney fire is a covered event and the tar that fed it accumulated gradually. Documenting the fire damage while it is fresh, before anything is touched, is what keeps a claim on the right side of that line. On an approved claim you pay your excess, typically €200 to €300. And no Irish insurer makes annual sweeping a condition of cover, whatever you may have been told.
Do you actually travel to Offaly?
Yes, for work that justifies it. The van works out of Clonegall in Co. Carlow, so Tullamore is around an hour and a half and Edenderry, over on the Kildare side, is closer. For a rebuild, a reline or an insurance job running across several days that is workable. For a small one-off call-out it is not sensible and you will be told so on the phone rather than after a wasted morning. Offaly jobs get grouped onto one run where the dates allow it.
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Chimney trouble in Offaly?
The survey is free and a camera goes down the flue before anybody quotes. If you burn turf, or you are about to stop, that camera is the whole point.