Roof, walls & outside
Chimneys and log burners: sweep, check, burn
A log burner is the one appliance in the house with an open flame and a chimney full of history. Kept swept and fed with dry wood, it is as safe as it is pleasant. The whole discipline fits in three words: sweep, check, burn.
By the Tickover team · Published 28 January 2026 · 4 min read
Sweep: the non-negotiable
Burning wood coats the flue with creosote, a tar that is both flammable and patient. A sweep removes it, plus the jackdaw nest you did not know about. If you burn wood, sweep at least once a year, and twice if the stove runs most days through winter. Smokeless fuel earns an annual sweep too, and even an unused open chimney deserves the occasional check, because birds do not consult you before moving in.
Book a certified sweep: HETAS-registered sweeps and recognised association members issue a certificate afterwards. Keep it; insurers can ask for it, and HETAS is also the register to check when a stove is installed or serviced.
The burning year
- Book the sweep, beat the autumn rush
- Buy or season next winter’s wood
- Test the CO alarm, check the rope seal
- Burning season: dry wood only
Chimney work, as a guide
Chimney sweep visit
Bird guard or cowl fitted
Chimney flashing repair
Sweep and cowl figures are derived from typical trade call-out and day rates; access affects everything on a chimney.
Check: the chimney from the ground, the stove up close
Twice a year, look at the stack through binoculars or your phone zoom, feet on the ground. Check the flaunching (the mortar crown the pots sit in) for cracks, the pots for leans, the joints for erosion, and the lead flashing at the roof junction for lifting. All of it is roofer work with proper access, cowls and bird guards included; the outside survival guide explains why chimney quotes swing with scaffold.
Damp on a chimney breast indoors usually means the stack is letting water in, flashing and flaunching first among suspects; pair that investigation with a scan for slipped tiles around the stack. Up close, check the stove door rope seal (shut the door on a strip of paper; if it pulls free, the rope is done), the glass and the firebricks.
Before the first fire of autumn
- Sweep done and certificate filed
- CO alarm in the room, tested, in date
- Smoke alarm tested while you are at it
- Door rope seal grips a strip of paper
- Firebricks and glass free of cracks
- Wood store dry, off the ground, air moving through it
- Ash bucket is metal, with a lid, living outside
- Chimney stack scanned from ground level
Burn: dry wood or nothing
Wet wood is the villain behind most chimney problems: it smoulders, tars the flue, blackens the glass and wastes the heat. In England, wood sold in small quantities must carry the Ready to Burn certification, guaranteeing 20% moisture or less. Season your own by splitting it and stacking it off the ground under open-sided cover for a year or two; a cheap moisture meter settles arguments. In a smoke control area (most cities), you also need authorised fuel or an exempt appliance; your council or sweep can confirm which you have.
Burning habits that keep the flue clean
Do
- Burn dry, Ready to Burn or properly seasoned wood only
- Run the stove hot and bright; a lazy smoulder makes tar
- Empty ash into a lidded metal bucket kept outside
- Refuel little and often rather than stacking the box full
Don’t
- Never burn wet, painted or treated wood, or household rubbish
- Do not shut the air vents right down overnight to keep it in
- Do not ignore smoke leaking into the room; stop and investigate
- Do not skip the sweep because the fire seems to draw fine
Book the sweep for late spring or summer; diaries fill from September, and the certificate belongs in hand before the first cold snap. It slots neatly into the winter preparation weekend.
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Quick answers
How often should a wood burner chimney be swept?
At least once a year if you burn wood, and twice a year if the stove runs most days through the winter. Once a year covers smokeless fuel. The best time is late spring or summer, after the burning season ends and before sweeps get booked out in autumn. Keep the certificate the sweep issues; insurers can ask for it.
What does Ready to Burn actually mean?
It is the certification scheme for firewood sold in England in small quantities, guaranteeing the wood has 20% moisture or less, dry enough to burn cleanly. Dry wood gives more heat, less smoke and far less flue tar. If you season your own logs, aim for the same threshold and check with a cheap moisture meter before burning.
Do I really need a carbon monoxide alarm for a log burner?
Yes. Building regulations require one in the same room whenever a solid fuel appliance is installed, and there is no sensible case for skipping it in older setups either. Fit it 1–3 metres from the stove, test it monthly, and replace it by its expiry date. If it ever sounds, get fresh air, put the fire out and call 0800 111 999.
Can I fit a chimney cowl or bird guard myself?
No. A cowl lives at the top of the stack, which is the highest and most exposed point of the roof, and fitting one is a job for a roofer or sweep with proper access equipment. Your part is spotting the need from the ground: birds going in and out, twigs in the grate, or smoke behaving oddly all point to an uncapped or blocked pot.
This guide is general information for UK homes, not advice about your specific property. Anything involving gas must be done by a Gas Safe registered engineer, and notifiable electrical work by a qualified electrician. If you smell gas, call the National Gas Emergency line on 0800 111 999. If you’re ever unsure, stop and get a professional in — that’s exactly what Tickover is for.
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