How to replace stove fire bricks
Updated: 22.10.2026
How to replace stove fire bricks is a cold job on an appliance that is already installed: photograph the layout, lift the baffle without cracking the neighbour, and do not light the fire if steel is showing. Product choice stays on the [fire bricks buying guide](/hub/fireplaces-and-stoves/firebricks/sub/firebricks-buying-guide). The [firebricks comparison](/hub/fireplaces-and-stoves/firebricks) is only the shortlist of plain rectangles. Prices and review lines in that comparison are from amazon.co.uk on 19 October 2026. A qualifying purchase can earn a commission at no extra cost to you.
How to replace stove fire bricks is a cold job on an appliance that is already installed: photograph the layout, lift the baffle without cracking the neighbour, and do not light the fire if steel is showing.
How to replace stove fire bricks is a cold job on an appliance that is already installed: photograph the layout, lift the baffle without cracking the neighbour, and do not light the fire if steel is showing. Product choice stays on the fire bricks buying guide. The firebricks comparison is only the shortlist of plain rectangles. Prices and review lines in that comparison are from amazon.co.uk on 19 October 2026. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Material | Cut | Title size | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  The Stove Wizard Fireclay bricks, pack of 6, stated 1300°C | Alumina clay | Not stated | 230 × 114 × 25 mm | 7.6 | about £25.19 | View offer |
 Hongyong 10 vermiculite firebricks, 230 × 114 × 25 mm | Vermiculite (title); ceramic (attribute) | Yes, in reviews | 230 × 114 × 25 mm | 8.0 | about £28.00 | View offer | |
 The Stove Wizard Vermiculite fire board six-pack, stated 1200°C | Vermiculite | Yes | 230 × 114 × 25 mm | 5.6 | about £24.49 | View offer |
On this page
When to stop and when a hairline can wait
HETAS describes a hairline crack in a stove brick as ordinary wear, and crumbling, a fallen baffle, or a hole that shows steel as the point where you stop. Chilli Penguin says do not light the fire if steel is showing, and a fallen throat-plate brick means the stove stays out. When your manual and a general article disagree, the manual for that stove wins. Leave the stove cold. Dovre classes firebrick removal as maintenance on a cold appliance. A like-for-like internal brick is repair, while a new stove, flue, or hearth is notifiable building work under Approved Document J in England. Approved Document J also expects a BS EN 50291 carbon monoxide alarm in the same room. That is an ownership baseline, not a step in the brick swap. Take a photo of the brick layout before anything moves.
Lift the baffle before the brick
Most wood burners hide the throat plate, or baffle, above the firebox. StoveSpareGlass’s fitting notes start by protecting the hearth, lifting that plate, and noting which way it faced. If you lever a side brick out while the baffle is still jammed against it, you crack the piece you meant to keep. Your manual’s diagram is the map. The best fire bricks page is for plain rectangles only. A notched baffle is a spares-diagram part. With the baffle supported, prise the damaged brick. Vermiculite snaps. Vacuum the ash ledge so the new piece sits on the same shelf. If the steel behind the gap is bright, or the throat plate will not go back, stop.
Cut dry and dry-fit
Measure the opening and the old brick: width, height, and thickness. A 25 mm board does not fill a 30 mm rebate. Mark the new board from the old one. Vermiculite in this set is what buyers cut with a wood saw, a padsaw, or a knife. One reviewer of the £24.49 six-pack used a wet tile cutter, soaked the boards, and had to dry them. Water weakens vermiculite. Cut dry. Dupré’s vermiculite-board sheet treats cutting dust as nuisance dust and says wear a mask if you have no extraction. Cutting dense fireclay is a silica job. HSE leaflet INDG463 gives a workplace exposure limit of 0.1 mg/m³ for respirable crystalline silica. Vitcas tells fitters to dry-fit a replacement liner, not to mortar a brick the stove was designed to sit loose, and not to block air gaps. Seat the new piece, then put the baffle back in the orientation you noted.
When to call a stove technician
Call a technician if the stove body is warped, if rope seals are burned through around the door, or if the flue still will not draw once the liner and baffle are seated. Replacing a rectangle does not cure a blocked chimney. Changing the appliance, the flue, or the hearth is not this job. Also stop if the new board would need you to drill the steel or close an air hole. The Stove Wizard’s short note is the right caution: same size and thickness, and do not modify the appliance. If you still need to choose between a light board and a heavy brick before you cut anything, that comparison is vermiculite vs fireclay.
Common questions
Can I replace firebricks myself?
Yes, on a cold stove, when you are swapping a like-for-like internal liner and you can follow the manual’s baffle layout. Dovre treats that removal as maintenance. A new installation, a flue, or a hearth is a different class of work and, in England, sits under Approved Document J. If the body is warped or the flue has no draw afterwards, that is a technician’s visit.
Do I take the baffle out first?
In the usual sequence, yes. Support the throat plate, note which way it faced, and only then remove the damaged brick. Forcing a side brick out against a seated baffle is how the next panel cracks. The exact clip or overlap is in your stove’s diagram, not in a universal shape.
Can I run the stove with one brick missing?
Not if steel is showing or the throat plate is down. Chilli Penguin says stop in those cases. HETAS treats a hairline crack as ordinary wear and crumbling as the point to replace. If your manual, like Contura’s UK FAQ, says replace immediately, follow the manual. A missing brick is not a hairline.
Should I cement the new brick in?
Only if that stove was built with a mortared joint. Vitcas says many liners are dry-fitted, and that mortar in the wrong place blocks air gaps. A review of loose boards that would not stick is about a forge, not a reason to cement a dry stove liner.
How do I cut vermiculite without soaking it?
Use a wood saw or a knife, outdoors or with extraction, and take small trims from a dry board. Wear a mask. Do not use a wet tile cutter. One buyer who did soaked the boards and had to dry them, and water is what weakens this material. Dense clay is a different dust risk, covered by HSE guidance on silica.
Related pages
Sources
Public UK sources used for this comparison. amazon.co.uk prices, stars and review counts were taken from the listings on 19 October 2026.
- Approved Document J (England, 2022) (retrieved 19 October 2026)
- HETAS, spring stove maintenance (retrieved 19 October 2026)
- HETAS FAQs (retrieved 19 October 2026)
- Arada, cracked liners (retrieved 19 October 2026)
- Chilli Penguin, vermiculite fire bricks (retrieved 19 October 2026)
- Vitcas, replacement fire bricks (retrieved 19 October 2026)
- Dupré Micalite vermiculite board SDS (retrieved 19 October 2026)
- W T Knowles fireclay data sheet (retrieved 19 October 2026)
- HSE INDG463, silica dust (retrieved 19 October 2026)