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Firebricks – heavy dense fire clay bricks

Firebrick also called as fire clay brick. Nowadays they are called heavy and dense Firebricks but old masters still call them fire clay bricks just because they are made of simple fireclay (which actually is the most ordinary mud.) Fire clay can be easily located out in the nature but it must containing the right refractory properties, suitable content ratio of silica and alumina. Some shops call these bricks fireplace bricks. They are used for instance for building cooking chamber in wood fired ovens, for creating fireplaces, all sorts of fire boxes and wood heaters’ lining, linings in a small or the hugest industrial furnaces, you name it. firebrick detailed photo Fire clay bricks are very heavy/dense having low porosity and even on various re-heating, and under continuous heat, they will last for very/very long time.

Some may confuse them with insulating lightweight firebricks, those are used in different applications. Dense firebricks can be cut only with diamond wheel attached to high speed handheld angle grinders, on an ordinary building brick saw or sliding drop saw for cutting bricks. Fire bricks can be chopped in half easily by using brick chisel and a couple of hits with a heavier hammer. It is fun and quick but may you want to achieve precise nice cuts hire a trade machine or buy yourself at least small size grinder. Before cutting soak the brick in water by dipping it in a bucket of water or in a wheelbarrow if you had too many. Leave the bricks in that water for 5 minutes minimum. Firebricks dipped in water before cutting with diamond wheel. The cutting diamond wheel will last you for a long time if the firebricks are cut wet plus you won’t breath in any dust, and of course cutting gets a lot easier and faster!

What firebricks type to use?

When it comes to fire-bricks and dense refractory products composition content often Alumina (AL) ingredient is looked at which ranges ordinarily between 18% to 40% of alumina in modern product’s body. The percentage range is important for choosing the right product for the right temperature or Orton Cone but mainly if a high temps are applied. Firebricks 24% Alumina content Alumina influences bulk density a lot and therefore also porosity, or if you like the weight of fire bricks. No need to apply above 26% in wood fired oven temperatures range but you can in case a low grade isn’t available to buy. Absolutely safely 18% AL amount firebricks can be used in wood ovens (you can melt and cast color metals in it too.) Furnace’s chamber build out of 18% will perform and last the same way as 30% alumina product.

Apart higher co$t, additionally, higher Alumina content grades make these bricks harder and brittle (more glossy if you like) making them absorb less steam e.g. from under pizza dough bases being cooked or bread dough. However one can get used to cooking in such oven fast.

Even though you can hear other words from a few suppliers who sell not locally manufactured product, conductivity and heat absorbing capacity is not influenced much at all by higher or lower alumina content. Higher grades won’t create magic temperature difference in cooking environment and vise verse. Main reasons for this are modern imports, one high alumina range suits all business and applications, less varieties to stock, higher markup and margin, those are the reasons if 18% to 26% brick isn’t sold by a store. Look for locally manufactured product, lower grades cost less to produce and they sell them for less. Where I buy refractory 26% AL firebricks costs $1.98 per one brick.

BTW mineral Graphite does not contain Aluminium oxide (Alumina, formula Al2O3 – density: 3.95 g/cm3) and it is lighter in weight by half if compared with Alumina mineral or refractory bricks. And even so, the Graphite absorbs much more heat than firebricks do – more reading about firebricks’ thermal conductivity.

Alternative for firebricks replacement page is handy and also the excellent article containing technical data with all physical properties of soapstone – soaprock.

  • 21% Alumina firebrick : 1850 tons Bulk density per Kg/m³ : Thermal Conductivity : 0.98 W/m.°K : 23-Orton 1620 degrees Celsius = 2948 degrees Fahrenheit
  • 24% Alumina fire brick : 1.925 tons Bulk density per Kg/m³ : Thermal Conductivity : 1.02 W/m.°K : 27-Orton 1640°C = 2984°F
  • 27% Alumina fire brick : 2 tons Bulk density per Kg/m³ : Thermal Conductivity : 1.05 W/m.°K : 30-Orton 1670°C = 3038°F
  • 33% Alumina fire brick : 2.15 tons Bulk density per Kg/m³ : Thermal Conductivity : 1.07 W/m.°K : 31 ½ -Orton 1700°C = 3092°F
  • 38% Alumina fire brick : 2.2 tons Bulk density per Kg/m³ : Thermal Conductivity : 1.13 W/m.°K : 32 ½ -Orton 1720°C = 3128°F
  • 40% Alumina fire brick : 2.25 tons Bulk density per Kg/m³ : Thermal Conductivity : 1.13 W/m.°K : 32 ½ -Orton 1720°C = 3128°F


Physical Properties of Firebricks (23% alumina product)

  • Bulk Density : 1915 Kg/m³
  • Modulus of Rupture : 5 MPa
  • Permanent Linear Change on reheating 5 hrs. @ 1400°C : -0.35%
  • Cold Compressive Strength : 15 MPa
  • Thermal Conductivity @ 750°C : 1.01 W/m.°K
  • Apparent Porosity : 28%

Chemical Composition of Dense Firebrick – 23% Al grade

  • Alumina : 23%
  • Silica : 73%
  • Ferric Oxide : 1.4%
  • Accessory Oxides : 1.1%
  • Titania : 1%
  • Fused Frits (ceramic composition/s)

Mass densities, weights of volumes and vise-verse, for various types of heat resistant materials can be easily calculated with refractory material calculators.

Who is your fire brick or refractory supplier, do you have contact-s on them and where are you located? Have you noticed chipped or seconds fire bricks being sold for better price somewhere? Please leave your comments for others below…

Names for fire bricks may vary

Fire bricks nay be called by various definitions. It depends on who works with them, names them too. Yes various entities — one more special than the other :)

Out of my head right now:
fire brick = fire-clay brick = refractory brick = chamotte brick = fireplace brick = heat resistant brick = chimney brick = dense/heavy kiln brick (for building kilns) = industrial ceramic brick (heavy).

Respond to the Firebricks – heavy dense fire clay bricks article:

111 Comments - post your thoughts

  1. My refractory supplier is ClayPave Pty. Ltd. located in Dinmore, Brisbane, Qld., on the way to Ipswich. They have distributors all around the country and Internationally.
    It is large Australian manufacturer of refractory and clay products. ClayPave produces all grades of firebricks. Heat resistant mortars, ready mixed air-set in bucket, or fire clay in bags to mix your own refractory mortar at home – one bag is plenty for building 2 ovens. Best prices, delivered if needed.

    Standard firebricks or splits: AUD$2 to $2.20 each
    Fireclay: $25 per bag (large bag enough for 3 ovens)
    Pre-mixed heat resistand mortar: $33 per bucket (1 needed)
    Packed on the top of the palette with firebricks.

    Web: – look for their refractory resales’ dealers in your area they are listed there, also for overseas.
    Phone: (07) 3282 1444
    Email: claypave[at]claypave[dot]com

    Factory & Sales Centre
    Chum Street
    Dinmore, Qld. 4303

    By Rado Hand

  2. Firebricks and refractory mortar in Perth, Western Australia:

    Ian Mears, phone: 08 9434 9202 / mob: 0414 885 337

    Mears Refractory Services pty. ltd.
    Unit 3
    9 Corokia Way
    Bibra Lake
    Perth, W.A. 6163
    Western Australia

    Ian is a nice bloke quite knowledgeable about ovens, very helpful, won’t mind to open the warehouse at odd hours when someone really needs when ran out of fire bricks. He hires brick saw -standing idle.

    By admin

  3. Look around in demolition yards. Read advertisements in papers, people very often sell for fraction of price or giveaway exactly this type of old bricks, and other great building material left over from other projects or from cleaning up. There are always few firebrick replacements to be seen here you just have to watch it. You can buy 200 of them even for 20 or 30 bucks in total and have lucky day. By the way these old bricks can be easily cleaned with hammer and brush because in the past brickies didn’t add much cement into mortar if any. Tables with firebricks physical properties.

    Pingback Alternative for Fire Bricks are the old red clay solid bricks. Firebrick substitude

  4. […] refractory are based on fire clay, alumina and silica. In fact all firebricks are made of fire clay. Like heat resistant mortars, insulation, pottery, ceramics, ceramic blankets […]

    Pingback Fire clay. Where to collect fireclay in nature and how. Buying fire clay.

  5. Where is the closest place I can get refractory cement from as I live in York Western Australia.

    By Colin Cable

  6. Did you check under ‘Refractories’ suppliers in phone book, or ‘Heat Resistant’ material?

    I will ask Mark if he doesn’t know a place there around you. Have you located firebricks?

    By Rado

  7. Im still looking for a refractory supplier close to me in York.
    If you find a supplier could you let me know as soon as possible.

    By Colin Cable

  8. Hi Colin, Firebricks in WA are a hard thing to source but I do know of a place that does supply them, The Potters Market 56 Stockdale Rd O’Connor,Tel No 93376888.I cant tell you how much they charge per brick but I do know in comparrison to prices paid in other states from refractory suppliers direct they are a bit more expensive.When I built my oven 3 years ago I used normal solid bricks ” Austral Collie ” which is a cream solid .My oven is as good today as when I built it, Hope that helps Mark

    By mark

  9. PS They also can supply your fireclay needs

    By mark

  10. Hi Colin,
    Yes the midland clay bricks Mark mentioned that he used for building his oven in Western Australia are almost identical to clay firebricks from Ipswich, they contain grog in the body as well. You can use them. Then there are solid clay bricks from Midlands somewhere, they are the same, can get the contact details if you needed. Maybe far from York?

    By Rado

  11. Rado,
    I hav ealready sourced some fire bricks,but Im more interested in getting some refractory cement for the fire bricks.

    By Colin Cable

  12. WILL TRY Ian Mears in Bibra Lake
    Thanks for all the info.

    By Colin Cable

  13. supplies in USA ; if you live in or near Maryland, you can get Mt. Savage “Medium Duty” fireclay bricks (43.1% alumina content) at Potomac Valley Brick and Supply Company. They come in yellow or red. I got mine at the Rockville, MD location (3 Derwood Circle), for $1.33/brick. They also sell the fireclay mortar in pre-mixed tubs. The bricks I bought there differ in dimensions (height) from the Australian ones (2.5 inches vs. 3 inches).

    Thanks to Rado for all the help!!!


    By Charlie

  14. I have looked locally in Western Australia – Perth:

    Potter’s Market at $3.95 per brick;
    Ian Mears at $3.88 per brick (smaller than normal 230x115x60);
    Veolia Refractories $7.80 per brick;

    Eastern States (prices including shipping cost to WA):

    Darley Refractories at $6.57 per brick;
    Claypave works at $4.77 per brick;

    Shipping makes it very expensive to get firebricks to Perth unless you order larger quantity of course.

    I have found someone who has a small quantity of leftover firebricks with 45% alumina content and is selling it for $0.50 per brick. I am a bit worried about the higher alumina content and its higher heat conductivity causing bread to burn at the bottom.

    Fondu cement ($40) is much more expensive than Portland cement ($6), but as you say, if I want to use it -it is just a small slab. I believe I will need about 4 bags of cement.

    By Tom

  15. Today I bought 7 bags of Vermiculite from “The Perlite & Vermiculite Factory” at address “Lot 802 Cutler Rd, Jandakot 6164, Western Australia” phone number 08 9417 8377. The price was $15 cash per 100L bag. This was very cheap compared to some Perth hydroponics shops who sell vermiculite in the 100L bag for $40.

    Best regards

    By Tom

  16. Suppliers in England. I live 22 miles from London.

    Vermiculite from Travis Perkins very large bags £9.40

    It is cheaper to go in a van on a cheap return ticket to France to buy the firebricks:

    Firebricks in France – from Leroy Merlin near Calais only Euro 1.21 each
    Firebricks from Ridgeons U.K. £2.47 + 17.5% vat

    Building sand very large bag from Ridgeons £46.73 + vat
    Ballast very large bag from Ridgeons £36.76 + vat
    25Kg cement from Ridgeons £ 3.49 + vat
    Fireclay 25Kg from Buildbase London £21.39
    Lime 25KG from Ridgeons £ 7.86 + vat

    If not used re-used or second-hand:
    Marine plywood for boxing very large piece £ 14.00 locally
    Small bricks from £0.30
    Hollow concrete blocks from Ridgeons £1.88 + vat

    My internal temperature reaches +500°C (932°F) and the outside walls and roof are +20°C (68°F) !

    I hope this will help.



    By David

  17. Tasmania – Firebricks and Vermiculite supply.

    firebricks with 28% Alumina content
    vermiculite (called shiralite) insulation


    East Tamar Maintenance Services Pty Ltd
    Temco Road
    TAS. 7253

    ph: 03 63822400
    ph: 0418 139041
    fax: 03 63822408

    They also stock other refractories or refractory materials.

    By Lou

  18. Thanks for the great information Charlie. I live in Maryland and was looking into getting a brick oven. I will have to check out Potomac Valley Brick.

    pays to live green’s last blog post: Save and Go Green on Gas

    By pays to live green

  19. Dear Sir ,

    I am glad to introduce ourselves as an supplier of various of common refractory material from China.

    We specialize in Alumina materials and products, Mganesia materials and products, such as Clay Brick, Bauxite Brick, Fused corundum brick, High Aluminum Block, Nozzle etc. shaped products and Calcined Clay, Bauxite materials, Gunning materials, Ramming mix, Refractory castable and mortar etd. Unshaped materials, which have enjoyed great popularity in the world market.

    You can refer to our website Fujingcn for further information.

    Should you find intrest in our items , please kindly let us know. We shall be pleased to give you our lowest quotations upon receipt of your detailed requirements.In our trades with merchants of various countries, we always adhere to the principle of equality and mutual benefit.

    It is our hope to promote , by joint efforts , both trade and friendship to mutual advantage.

    Yours sincerely


    Qingdao Haotai Trade CO.,LTD

    NO 10 Shandong Road

    Qingdao China

    By Mary

  20. My Firebrick supplier is Vesuvius SA (professional (huge scale) refractory selling directly to the public, too), located off Porcelain Road in Clayville (Olifantsfontein), Midrand, Gauteng. A huge variety of shapes and sizes can be bought from them, as well as various grades and purpose oriented refractory mortar, etc.

    I am located in South Africa.

    More details on Vesuvius can be found on the Internet (, including telephone numbers, etc. Vesuvius is an international company with branches in other countries too.



    By Abrie Willemse

  21. Very informative post with a lot of historical and present use and name of the bricks. I think this have the ability to convey its meanings and attract the readers attention to this product.

    By Liquid Roof

  22. Dear Sir:
    we can supply Fireclay brick at more lower price that you need urgently ( FOB AUD$0.4-1.2 )

    We are professional supplier for refractory brick & ceramic fiber product at competitive price, located in Zibo City, Shandong Province, China. For more information, please check our website ( , ), and select the products that you’re interested in.

    We have great interest in developing business with you, should you have any inquiries or comments, we would be glad to talk in details through MSN: or any way you like.

    By Price: AUD$0.4-1.2 Fire clay brick

  23. Either way they’re pretty expensive. I can’t afford to buy the ammount of clay bricks I need.

    By Dekoracja Okien

  24. Thanks for the usefull info guys. How many firebricks would one need for a “standard” wood fired stove?

    By Jack

  25. Home depot has fire bricks for $1.15, I haven’t found the content info yet

    By Mark Allen

  26. If you are importing or plans to import fire bricks or high alumina bricks upto 70-80% contact us. We are India based manufacturing company, established 1978 indulge in manufacturing all kinds of fire and acid proof bricks along with allied material.

    By Vivek

  27. Brikmakers located in South Guildford, Western Australia, make solid clay bricks and their Geologist advises that their Standard Face Cream Smooths are ideal for pizza ovens with their composition being about 25% Alumina and 68% Silica. At only $195 for a pack of 264 bricks, that works out to about 73 cents a brick (pick up).

    By Paul Smedley

  28. Dear Sir
    we have Enq for insulation Brick and castable for gas filter & Economizer
    we will send the Enq if you interset with best regards
    Asaad alrawi

    By Asaad

  29. Folks in and around Central & Western Arkansas (USA) can find good quality firedbrick (9″x4″x2.5″- really 2 & 1/8″) at ACME BRICK Company at Malvern, AR. ($1.40/each as of FALL2009). also good source for fireclay mix (100# sack), “everset” mortar (high temp mortar mix for hearth construction w/ firebrick).
    If looking for vermiculite for insulation. can buy large quantity at reasonable price from MIDSOUTH CONTROL & SUPPLY of Fort Smith, AR (really Van Buren, AR).
    can follow along our oven construction at:

    photos of stone oven built

    Regards, P. Shepard

    By P. Shepard

  30. Dear Friends:
    We are an ISO certified manufacturer of fireclay bricks in China’s fireclay brick base Zibo City.
    Our quality and price is way more competitive. If you are interested to buy from China directly, please email me at or MSN

    By James

  31. i do blacksmithing and im looking for fire brick to line my forge with can you sugest where i can get the fire brirk for that high of a heat

    By joe

  32. I live at Sauble Beach on the Bruce Peninsula, 220kms NW of Toronto, Ontario. I can purchase refractory bricks from Shouldice Designer Stone for about $2.10 / 2-1/2 inch brick (in Metric equals to 64mm thick firebrick). They also supply the cement, thru my local building supply dealer, Miller Home Building Centre in Sauble. I should be starting building my oven approximately April 15, depending on delivery. Doug

    By Purchasing refractory fire bricks in Canada.

  33. Anyone know where t buy cheap firebricks in sydney??

    Please let me know,

    By G

  34. I just got the specs on the firebricks sold where I live in Canada and which are imported from the US.

    Thermal Conductivity (K-Factor)
    At a mean temperature of ft2hr°F W/m°C
    400°F (205°C) 8.2 1.18
    800°F (425°C) 8.5 1.23
    1200°F (650°C) 9.0 1.30
    1600°F (870°C) 9.2 1.33
    2000°F (1095°C) 9.5 1.37
    2400°F (1315°C) 9.8 1.41

    TYPICAL CHEMICAL ANALYSIS, Wt. % (calcined basis)
    Silica (SiO2)…………….. 56.02
    Aluminum Oxide (Al2O3) ……. 37.50
    Iron Oxide (Fe2O3) ……….. 2.09
    Titanium Dioxide (TiO2) …… 1.99
    Potassium Oxide (K20) …….. 1.47
    Magnesium Oxide (MgO) …….. 0.36
    Calcium Oxide (CaO) ………. 0.30
    Sodium Oxide (Na2O) ………. 0.074
    Zirconium Dioxide (ZrO2) ….. 0.068
    Chromium(III) Oxide (Cr2O3) .. 0.039
    Phosphorous Pentoxide (P2O5) . 0.036
    Manganese Oxide (MnO) …….. 0.007
    NiO …………………….. 0.012
    Total …………………… 99.97
    Loss on Ignition, 1000°C ….. 0.13
    We certify that SMITHFIELD (Unbranded) Dry Press Firebrick
    manufactured at our Alsey, Illinois plant conforms to ASTM
    Specification C-27 – Class 4.1.4 and 4.1.5 for Medium Duty
    and Low Duty respectively and C-1261-98 (which includes C-
    24 and C-67), as well as, C-16, C-20, C-24, C-38, C-113, C-133.

    They are called ‘Medium Duty Firebricks’ however it seems the aluminum content at 37.50 is at the high end and not ideal because not steam absorbent, when compared for instance with firebricks around 23% AL mark, and therefore does this make it very hot or dry ovens which can’t absorb steam (?).

    But could anyone here with experience please give me an idea as to whether these are good or not, and if not ideal, does anyone have a good supplier in Canada. They are charging $4.00 a firebrick here inc. tax, which includes shipping from the States (with bulk freight accounts of course), but maybe it is worth my while to find a more ideal product and ship it in.

    By Ashley

  35. Hi Ash,
    Have you noticed the comment above regarding buying firebricks in Canada? Maybe it helps.

    Could you ask in the place for the alumina content and also Technical / Physical Specifications of the Low Duty firebrick type that they stock or manufacture? Plus the price?! Can you please let us know those and also the contacts for this company? Low Duty type is what I use and also those they have on offer can be great for this purpose and the temperature range.

    You can use the mentioned 37.5% alumina. Even though they withstand continuous use in a lot higher temperature ranges that could never be reached in wood fired ovens and they also cost a bit more, you can use them. They will perform just as well. Regarding the steam absorbing – the same applies to refractory clay tiles or oven floors made out of larger clay blocks (I am not talking about ovens whose have the hotface cast from a heat resistant concrete mixes because I don’t work with them myself in building ovens); basically because the fire bricks with high AL content are denser (glossier/heavier), they have lower porosity so the effect is they absorb moisture ( steam ) slower when compared with firebricks with higher porosity which is common for lower alumina firebrick grades. This effect is minimal. If you work with ovens that have been built from both clay types, low and high alumina content in the brick’s clay body, you will notice only a slight difference when cooking or baking. But this difference can be gotten used to with practice perfectly. With the higher AL grade clay, if you make pizzas in high temps atmosphere, when you place the fresh dough (pizza base) on the hot firebrick floor in the first few seconds the steam builts fast and literally uplifts the pizza.

    And logically this effect is even more minimal with floors made out of firebricks because there are many little join lines between all the bricks therefore also the steam from under the pizza base runs out fast (with oven floor made from tiles or a large smooth blocks the steam under the dough holds just a bit longer. Plus, the fact is that firebricks work also as many nicely moving fragments in the heat expansion and shrinking – in contrary the reality is that larger blocks either in the floor or in walls, and square tiles, are often cracking across and the occurrence is caused by the heat expansion with cooling down shrinkage and these heat differences in flat material.)

    By Rado

  36. To: Sydney, AUS builders.

    I recently found a source of refractory “tiles”. The gentleman has heaps of them and is selling them for around ~1.50ish. I’ve decided to buy a few and try to use them for the inner firebrick arc and maybe break one up into bits to use as a replacement for the broken terracotta tiles filling.

    I’ll speak to the seller and ask him if it’s ok to post up details on this site or if i can pass them on.

    By G

  37. When i see pages like this one about refractory fire bricks i cannot help but be jealous …. i wish was a bit more tech savy to be able to offer great info like you do about pizza ovens fired by wood with all the info on heat absorbing / resistant material or heat insulations … keep up the good work. Thank you.

    By Emile Loukanis

  38. Anyone know where to buy cheap firebricks in Vermont South Victoria Australia ?
    Please let me know here or

    By Piro52

  39. We supply 2.0g/cm3 max. density firebricks for pizza oven.
    The bricks are burned at high temperature in kilns, which can stand higher working temperature. The typical bulk density of our bricks is around 1.8g/cm3. The brick color is white. while the Al2O3 is around 40%, Fe2O3 is below 1.8%. Is there anybody having interest to cooperate with us on marketing of this kind of bricks, feel free to contact us for the further information. My MSN is

    Oh. We are a company from China.

    Thank you!

    By Harry Lee

  40. Here is a link to the place I got fire bricks from ( Clayburn Industries Ltd. ) they manufacture fire-bricks there and also they have fireclay and refractory mortar available. The refractory supplier sells in location, China, India, Canada, USA. 3 inch bricks cost $ 4.00 each and 2.5″ sell for $1.80 US only per one firebrick.

    By Brad M

  41. Hi Rado – great site and information on wood pizza ovens. This is a mesage for Doug in Sauble Beach who said he was building an oven – did you finish? Did you go to get the firebrick and were they right for the job? Anyone use the old clay bricks Rado suggested as alternative instead of firebricks and how did they work? Thanks! I am Tom in Balaclava Ontario – not far from Sauble Beach.

    By Tom calling for Sauble Beach oven builder

  42. I am looking for a local supplier of firebrick for building a wood kiln for firing pottery. Ideally I would like to find them second-hand to keep the price low or free. I live outside of Denver, Colorado. Any suggestions would be appreciated.

    By matthew

  43. Please note that IF you can find an off white/cream colored solid brick, just the fact that it is not red shows that it has very little iron compounds. It is the iron compounds, or , rather, the LACK of same that aids in the higher firing resistance of that color of brick. If you are not sure, then find a friend who would be willing to ‘re-fire’ one in their electric kiln, say at 1800F+, and see what happens. If it stays intack, and does not blow apart, then you may have a good product, the higher temp the better.

    By mik

  44. What kind of sand to build new wood fire place as I will use the hard fire bricks as I have the fondu cement waiting to start and how much of sand to mix with fondu and water to mix?

    Thanks enjoying your site.
    Regards Doug

    By Douglas

  45. Hi Rado
    i am in the process of building another pizza oven as i bought the building plans from you a long time ago. I have bought some refractory brick but unsure what the grading would be. Stamped on the side it says AS1-1-76. Any help would be appreciated. thanks

    added by Rado: Can you email me a clear photo of the refractory brick? Also, if you cut or brake one of these bricks in half, take one image of the body inside, I need to see it. You can email large photos to pizzapaddle at gmail com. Set camera to “macro” for taking sharper close-up images, like that it gives nice details of the clay body and of the grog inside, color and how coarse it is. I will reply with the answer.

    By type of refractory fire bricks

  46. I have some free firebricks that have never been used for a cement kiln. They tell me though that they have 70 alumina. The firebricks are 8 1/2 x 7 1/2 x 2 1/2 in size. Any idea if these will work for the floor and the walls?

    By Mel

  47. To all those building or wanting to build Wood Fired Pizza Ovens in Melbourne or around Victoria, help has arrived.

    The Melbourne Fire Brick Company specialises in supplying refractory fire bricks, mortar, castable and insulation specifically for building Wood Fired Pizza Ovens. Our prices are the most competitive in Australia, and all our materials are of the highest quality. We stock 30% Alumina refractory fire bricks in a range of different shapes and sizes, including arch bricks which are perfect for building the dome of a Rado Wood Fired Pizza Oven.

    Please don’t hesitate to visit us at The Melbourne Fire Brick Company to see what we have to offer. We take pride in our customer service, so feel free to ask any questions that you might have and we’ll do our best to help you in any way we can.

    Thanks for the brilliant website Rado, keep up the great work!

    Best regards,

    The Melbourne Fire Brick Company

    By The Melbourne Fire Brick Company

  48. Dear Sir,

    We have below firebricks in the stock. Kindly inform your interest.

    Size: 230x114x65mm (9” x 4.5” x 2.5”) 15000 Bricks
    – Al2O3 : 39-40%

    – Fe2O3 : 2.8 to 3.5%

    – BD : 2.00 to 2.1 gm/cc

    – AP : 23 – 24%

    – CCS : 350 kg/cm2

    – RUL : 1350 – 1400

    – PCE : 31

    Size: 230x114x65mm (9” x 4.5” x 3”) 40000 Bricks
    – Al2O3 : 39-40%

    – Fe2O3 : 2.2 to 2.5%

    – BD : 2.20 to 2.25 gm/cc

    – AP : 22 – 23%

    – CCS : 350 kg/cm2

    – RUL : 1350 – 1400

    – PCE : 31

    Best Regards

    Pramesh N Gandhi

    By 39-40 Alumina Fireclay Bricks In the Stock

  49. hi
    does any one know off a cheaper place than clay pave in Queensland to get fire bricks, they are $3 a brick there.

    By anthony

  50. Can I make and fire my own highfire bricks? I have a reduction kiln that I fire 4 times a year to cone 10 or 2300 deg. I want to build a wood kiln next summer. how much silica would I need ect…

    By make high fire bricks

  51. The Firebrick and Refractory Company, in Sunshine West, Victoria, Australia, sells 38% firebricks for A$3.30, or $3.00 by the pallet.
    Current June 2011. I found them very helpful and efficient. Also bought arch bricks, splits firebricks, refractory mortar etc. I would recommend them.

    By Mick

  52. It is to bring a kind knowledge that we are the Manufacturer and Exporter of full range of Refractories from low grade to High Alumina dense bricks, Acid Resistance Bricks, Insulation Bricks and Refractory Fire Bricks and other custom shapes and critical shaped bricks suitable for customers requirement.
    We not only deal with bricks but also All other varieties of Industrial Minerals like Ramming Masses, Bentonite, Fire Clay etc.
    We also distribute Insulating Ceramic Blankets, Mineral Wool, Glass Wool etc.
    Our product range is as per following items:
    refractory bricks,
    high alumina bricks,
    dense high alumina bricks,
    magnesia carbon bricks for ladle,
    magnesia carbon bricks for lrf/eaf/uhpf furnace,
    alumina mag carbon bricks,
    alumina silicon carbide carbon bricks,
    all types of basic bricks ( mag chrome/chrome mag/magnesite),
    acid resistance bricks,
    hotface/cold face insulation bricks,
    pcpf blocks,
    normal fireclay bricks,
    dense fireclay bricks,
    long bricks,
    plates / tiles,
    burner blocks,
    skew blocks,
    tundish board & lunder board,
    silica tundish board,
    magnesite tundish board,
    duplex tundish board,
    tundish management,
    tundish sealing compounds,
    silica ramming mass,
    silica ramming mass quartz base,
    pre mixed silica ramming mass,
    silica ramming mass top patch,
    silica ramming mass quartxite base,
    acid resistance mortar,
    cement products,
    refractory bed material,
    radexo ladle cover,
    ultra low cement castable,
    insulyte castable,
    insulation mortar,
    basic mortar,
    fireclay & high alumina mortars,
    tundish/ ladle covering compound,
    nozzle filling compound,
    basic spray mix,
    basic ramming mass and gunning mass,
    high alumina ramming mass and patching mass,
    lpw cement castable,
    all types of alumina & high alumina castables,
    ceramic fibre blanket,
    ceramic fibre blanket having density of 64 kg/m3, 96 kg/m3 and 128 kg/m3,
    ferro silicon,
    silico manganese,
    ferro chrome,
    ferro molybdenum,
    and high carbon ferro chrome.

    We work very hard to provide our customers the best quality products at the most competitive rate. We are very well known for our quality, services, good will and customers satisfaction.
    Please feel free to mail us or call us for any requirement.
    Find the attachment of the catalogue for some of the total products we deal in.
    Thanks with Regards,
    Naveen Mishra
    M/S Ruchie International
    2/218, Sector-H, Jankipuram, Kursi Road,
    Lucknow, Uttar Pradesh, India
    Pin:- 226021
    Tel no:- 0091-522-2732789
    Mob No:- 0091-8081322325

    By Exporter of Refractory Products

  53. Hi. I’m from Uni of WA. I just need two pieces of fire bricks which should withstand 1000℃. Could you send me a quotation including shipping, please?

    By Chao Luan

  54. I am looking for red fire bricks to buy for the purpose of house construction and kitchen ovens. If you have any information on these alternates to replace firebricks please contact me.

    By Anandi

  55. Do fire bricks need mortar in a wood burning fire place?

    By fire bricks and mortar

  56. May i know why we call silica as acid refractory?

    Added by Rado: Not in everything is silica (and zirconia) referred to as acid refractory. Usually this is for acid resistant firebricks or other acid resistant refractory shapes or substances. Acid resistant firebricks are used in places where the atmosphere or the slag (a byproduct coming e.g. from smelting – to separate metals from unwanted matter) are acidic, toxic. These are different bricks to the firebricks we use for cooking ovens. Acid resistant refractory materials will face these acids but on the other hand can be be damaged (most probably so) by an alkali atmosphere.

    By Swapna

  57. I request to be taught to make fire bricks by myself because in our country we have no producer of this important product = firebricks.

    By majid

  58. […] Firebricks are made from simple fire clay and this fireclay is basically an ordinary mud, but, which has the accurate body properties for thermal conductivity, bonding, and high heat withstanding. Cutting … I buy refractory firebricks of 26% AL at costs $2 per each brick. As Rado already pointed out, the mineral Graphite is much lighter in weight then fire clay bricks, by half when compared with Alumina or refractory bricks, and it has much better heat conductivity and the heat retention properties … Who says that the heavier is better?! […]

    Pingback Bricks prices

  59. I have just been told I need to pay $8.00 per brick for my inbuild fire which i think is terrible but only place I have found in Tasmania.

    By fire bricks for wood fire

  60. Hey fellow CANADIANS. Does anyone know where to get good firebricks in ONTARIO. I am located in the Kawarthas north of Peterborough.

    By Enrico

  61. The only place that I have been able to get firebricks from is ” East Tamar Maintenance Services ” at $ 6:10 per brick 65 % Alumina, still too expensive.

    By George

  62. Rado, thank you very much for the disk. I have been pouring over it, and will soon be starting on construction, an MTo with some changes. I have a few questions if I may. The main one is how do I post a new thread to the forum? I have been reading most of the questions, and they have been very helpful, and I think my questions may help someone else, but I can’t figure it out.
    My question on building is:
    I an going to have a few (20 or so) firebricks left over. As I want to use my oven primarily for baking, I figured that I should use them in the dome. Would it be OK to replace a horizontal brick with two vertical bricks? The bricks would be sticking out into the concrete shell, and hopefully conduct heat back into the oven easier.
    The only difficulty that I can see is how to cover them with alfoil, but I think I can work that out without too much trouble.
    The whole think would be covered in the concrete shell, which then would be a little deeper than you show, but that would only be a good thing I think.
    My description is a little hard to visualize I know, so I have emailed you attached a pdf of my plan, for it is clear (I drew them up in Sketchup, a great free drawing-program by Google.).

    Thank you once again Rado, your site, and the obvious effort you put in to it is a testament to you.

    Regards, Glen

    added by Rado :
    Hi Glen,
    Thank you for the note.

    Larger ovens, or any ovens where the owner requires bigger heat absorbing mass and whose are heated up daily, use vertical firebricks in the arches instead of horizontal. Or two levels of horizontal laying in constructing this dome. I think efficiency is what you have in mind, as you’ve mentioned using your oven primarily for baking. How many bake batches do you plan to reload from one firing? Because the oven as is on the disk will keep normally for 3 – 4 hours stable where you can reload loafs, slow roasting roasting pots at the same time with breads, etc. several times, starting at 200 to 220 degrees C and even higher/earlier start – 392 to 428 degrees Fahrenheit.

    You mentioned 20 left over firebricks so I reckon you contemplated only a randomly added here and there firebrick as it’s shown on the pdf images. As I see it; setting the second halves into the concrete cladding layer would make the upper halves firmly set and held in the position. This system will function only on ~ 50% success because those bricks would not move the same way as the rest of them among in the arches, there will be different adjustments. Most probably the outer half of all these horizontally positioned firebricks set in the concrete would separate. Meaning, the halves would brake off by very easy smooth and almost precise but tiny straight crack right through the middle of each firebrick, at the concrete level line. The outer firebrick halves would function just like the cladding as they would become a part of cladding.

    My suggestion would be; if you plan on increasing the oven heat absorbing mass either put all the fire bricks in arches horizontally or add inch or two inches extra thickness to the concrete cladding layer. Heat up slow way the dome before cladding is poured on the top over the firebrick arches, just a little from the inside, to soak a slight warmth through the firebricks so they expand a little (electric radiating heater or small gas burner as the heat source for this work well and cleanly – when I use a mini wood fire instead to do this, I close the oven entry after that till the end of construction when staring with drying fires.)

    Thank you for adding the PDF images. The forum is closed for 3 years; once when I went to Europe I looked for admin/s who could take over but I didn’t have the time to find someone I would know better and trust. Currently I can answer these blog posts easier. There will be a new much better forum though.

    Does this help you? What type do you plan to bake? I do sourdough rye and spelt (with a little bit of wholemeal-wheat just for conventional taste in the dough. I use 120 yr old sourdough culture, baking is my hobby, that’s why ;). Fulfills all senses and always amazes everyone. But roasting poultry isn’t bad too.

    By Glen

  63. Hi Rado,

    I just finished the first 3 layers of the dome, now coming down towards the door. My question is regarding the piece of angle iron. What holds the iron angle in place? Is is just the weight of the bricks and then the surrounding mortar holding it in place. Or is there some epoxy cement keeping it in place. Thank you. I will send photos once I get past this stage.


    added by Rado :
    Hi Bill,
    If you build Swishy design; yes, only the weight and then the cladding hold the angle iron in its place. There wont any movement to shift it of its position. Have a look at image z7 and a few images around the z7, while working with bricks to avoid knocking -it can be temporarily held in precise place (just supported as it leans on) by the wooden boxing. Masterly Tail design does not use this metal angle at all, it is metal-less dome design!

    By Bill

  64. Gongyi Tianyi Refractory Co.,Ltd which is specialized in refractory material for steel making industry with almost 10 years experience.

    Our offering following products:
    Refractory brick, ramming mass, castable made of alumina, magnesia, silica, silicon carbide, carbon, widely used in electric arc furnace, converter, tundish, ladle and so on.

    By Betty

  65. Interested in the left over 45% alumina firebricks. Living in Kalgoorlie little home made forge hopefully.

    By Tom 45% leftover alumina fire bricks

  66. Your site is inspiring!
    When i make my oven, can I use a 1″ piece of granite counter top for the cooking base?
    Best regards,
    Location: Whitehorse, YT. Canada

    added by Rado:
    Dear Norm,
    Thank you for the note. It would be very thin, one inch surface won’t function well. Plus it is always better to create the hot-face inside the oven out of many smaller segments. Small pieces, like firebricks, either in walls, vault or hearth, cope much better with the heat differences in material phenomena. Fragments in building, which moves by temperature changes, just like in wood fired ovens’ dome designs, prevent possible cracking down the road.

    By Norm

  67. I have recently started a job at Bridgetown High School, taking on the School Sustainability Teacher Position from someone who passed away unexpectedly earlier this year. He was building a pizza oven, but we can not find any plans or details of the design he was using, so are a bit unsure of how to finish it off. We need to finish it off because it has been built using grant money. I have attached some notes from what I have found out and from looking at photos, and was wondering if anyone could give me some advice about how to finish off the oven? I can email photos to help the description if someone is willing to help.


    1. Standard cement base was built then lifted into place on top of some brickwork.
    2. Sandbags were placed in the center to make a dome, with yellow sand filling the gaps to make the dome nice and round. There is no opening for a flu/chimney. The sand was covered in wet newspaper to make the shape for the dome.
    3. Clay was built up around this shaping dome. I think it was standard terracotta clay that is usually used for art purposes?
    4. Normal house bricks were built up around the clay dome, I think using normal mortar/cement to join. (not fireproof).
    5. Chicken wire was placed over this so that it could be rendered.
    6. Sheep’s wool was layered over this for insulation, and rendered to finish.

    Unfortunately, it was not fired straight away, and the terracotta clay layer has absorbed moisture and shrunken away from the brick layer, and much of it has fallen inwards, so that the raw house bricks are currently exposed bare to the cooking chamber, with a bare cement floor.

    Is it possible to get some flat/thin fire bricks for the base (heat absorbing ones) for cooking on, and lay them loosely on top of a 1 inch layer of double-washed river sand for insulation to protect the cement base, then render the inside face of the house bricks with some castable? Or do we need to put some insulating firebricks around the inside edges of the house bricks as well? Do you have any ideas/advice?

    We just need to get it finished ASAP, with as little work and as cheap materials as possible (approx $300 or less). We wont be using it all the time, maybe 2-3 times a term, so 8-12 times a year, so it doesn’t need to be indestructible, just usable for the next 5-10 years at that rate (if possible). Any advice /costings you could give would be greatly appreciated!

    By Anthea

  68. Hi Rado,

    Thanks for the disk and the quick links in your email. I’m trying to figure out which bricks I need to get for building in Japan.

    There are several different ratings SK32, SK34 and more.

    The SK32 are cheaper,
    SiO2 – 59.6
    Al2O3 – 34.4
    Fe2O3 – 1.3

    The standard size is 230 x 114 x 65mm These seem pretty close to the 2.5 inch bricks that you mentioned.

    Will those be suitable?

    added by Rado :
    Hi Philip,
    I am on my way back home from a series of remote jobs. If I am late with reply I am sorry for that, end of year is always busy for me.

    These SK32 firebricks are fine of course (email me a close up photo of the brick i will comment further if you like! A sharp and large original large/size image is the best as I can read more on the brick body from the close up/macro etc.) – read further below more on that and also see the pdf file attachment I sent you email – all dimensions for numbers of firebricks and how they all go, your the size 2.5″ (inches) = 6.4mm thickness, also 9″ long firebricks – the 6.5mm will be the same basically for these firebrick count.

    Building brick oven is not hard to do, many people who never held a brick have built nice ovens for themselves. Basically; take it by building gradually, focus only on the one stage that you do. From the detailed photo sequence you will see ahead exactly what will be done, and how. Each stage/step on its own (e.g. the slab, inner walls, top slab, firebricks part etc.) is little job and easy. And stage by stage the structure grows nicely. Not much measuring goes around, only on the ground slab for the inner and outer-decorative walls, after that the oven is risen upwards and all is done on the initial brick count (you will see on the disk how I approach this. If stones are used for making the outer deco walls then the depth and width lines can be 2″ – 5cm further apart, on each side, because some rocks might be larger/wider than ordinary house bricks.) The photo sequence is detailed. To reach a stage e.g. what is on the picture 1430 in 3G MTo design, it can be done in 7 days but you do not need to do it in this timing. Work with cement blocks filled with concrete or with firebricks is faster, and there is waiting one and half day (or anywhere longer) for curing the ground and upper slab for the cement to cure. If you had a friend/s to help you, e.g. to lift the concrete blocks (these go into 4 rows, hip level) and to mix concrete, it’s only great, you can cook for them pizzas later.

    * For the 3G MTo ground slab dimensions; what concrete blocks do you use? I reckon in USA your standard block size is the 15 5/8 x 7 5/8 x 7 5/8 inches (16″ x 8″ x 8″). These are great for the building and are basically the same that I use. Let me know in case if you choose a different size and I will send you your slab dimensions according your block size.

    Dimensions for the ground slab when 16″ x 8″ x 8″ concrete blocks are used: 66″ x 90″

    The slab is 4″ thick and in addition the slab has also at least 1 foot deep and 1 foot wide footings around (sized for the weight), this concrete footing/foundation is reinforced with 1 rebar in each side. The whole slab surface is also reinforced with the metal mesh.
    *(In freezing climates make the footing below the frost level; as per the usual building practice applied/common in the area. How deep is your frost line? If it’s less then 1 foot below or if there is hard clay or rock ground then you will not need more to do. If deeper fastest I have seen digging down below the frost line and filling it with tapped down or vibrated rock all the way up just near the ground level and then slab poured on the rock. I would rather create footing at the bottom and from it rise cement block walls.)

    IF you would like to have more space for the insulation around the oven, the gap between the oven part and the surrounding boxing walls, so the structure isn’t exactly compact, just add one half block to the total width, it will give you more room internally. You would only add 8″ to the total width.


    By Philip

  69. Wow!! Thanks for the super quick response!! The PDF with the layout is a great help.

    I’ll send you a photo of the bricks.

    One more question: The PDF specifies bricks that are 50mm thick for the first two flat rows along the base. Here in Japan, I haven’t been able to locate the 50mm bricks. I’m trying to think of ways to work around this.

    Option 1: Just use three rows of 64mm bricks and end up with a ceiling that is about 28mm taller than the diagram.

    Option 2: Put the first row bricks on end so that instead of having two rows totaling 100mm, I end up with one row of 114 (14mm taller than the plans). I could double this row so I still have a fairly thick base. The third layer would be the 64mm row that the plans show.

    Option 3: Oddly, they have bricks that are wedge-shaped 50mm on the small side and 64 on the big side. It would mean that the wall starts to curve from the sides.

    Thanks again,


    By Philip

  70. We manufacture wood for smoke flavor as well as wood for kilns and ovens like those used for making bread or Pizza. We are in process of remodeling and we have refractory bricks we are selling – they are over 89 years old and had been used for holding temp in a boiler room. They are in mint condition you can see pics of them on our twitter feed @mojobricks – sold in lots of 1000 contact me for more info 773-398-1992 1.16.2013 They will be gone by March 1st ( we hope!)

    By fred grosse

  71. Not once do you tell the price of the fire bricks or if they are for sale ? Wish to buy these firebricks to build Bar B Q pit and oven on the side.

    By Harry

  72. Hi Harry,
    Thank you for your note.

    Price of firebricks? This article deals with that and not only how much per firebrick – also how to locate them much cheaper plus other useful information. In the comments down this page people share the prices they got and more. Be aware that many places re-sell firebricks commonly for 200% + mark-up, even 300% I saw personally, therefore simply look around to find the best price.

    * Also for USA locations – More Good Hints if practical :
    Basically – my prices: Material cost and custom jobs when I build for people; the total cost of the material can be reduced by 70% if you buy all from advertisement papers, we do this all the time because it’s worthy. People sell for fraction of price, or giveaway, great left over material from other building projects (phone early or traders get it.) Otherwise in shops, if ordinary and new material is used the total material cost I have is $1350, but I buy firebricks for $2.10 each, if from supplier that is, although we purchase many palettes / year. Material cost for the inner refractory part I have is $550, I pay 2.10 per one firebrick and this is around my area when I do not have them delivered. As they are, Swishy is built for $5500 and MTo for 6500 (only extra 30+ firebricks though if it’s of the original size however can be done larger or smaller internally easily just by placing in or taking off a brick from a side.) If the outside decoration walls are build out of stones instead of house bricks but on the same wall lines, or an unique material, it’s considered as art or crafting and the extra time counts for extra price. If landscaping/paving around the oven it’s around 1000$ if an ordinary stuff is worked with, the 1K includes work. For putting together only the firebrick part the cost is $1000 (work only not material), 1-2 day-s max. If needed browse also this page for house bricks, blocks, firebricks:
    Look for House Bricks, Fire bricks and Cement Blocks etc. good deals on one page with Au., USA and U.K. options.

    The plans have this info what’s above in the text file somewhere.

    Warm regards,

    By Rado

  73. […] : Hi AK, Firebricks are very often called by different names (it depends who works with them, firebricks quickly adopt a nick name for the subject), e.g. fire-clay bricks, chimney bricks, fireplace […]

    Pingback firebricks-with-chipped-edges

  74. Hi Rado. I attended a pizza oven workshop with Alan Scott in 2006 in Victoria but unfortunately circumstances conspired to stop me building one at that time. I have since moved to Tasmania and now have the oven building bug again. I have notes from my 2006 workshop but am unsure where to get the specialist refractory materials here in Tasmania. Do you or any of your many contacts have any information that would be of help? Thanks.

    By Russell

  75. Hi Russell,
    This is what I found/recovered so far, a note from another builder in Tasmania, Hobart :

    > The Firebricks are supplied by K&D Brick supplier in 110 Giblin Street, Hobart, Phone (03) 62287828 and the Price is $4.95 per Brick..
    > As a Contractor, you can most probably get a better Price then I can.
    > When you are in Hobart, please make Contact with Me for a Drink, Pow Wow and the usual European Type get together.

    * Please let me know if it was of any good use for you! Thank you.

    Warm regards,

    By Rado

  76. Good day everyone, anyone knows the least expensive source of fire bricks in QLD Australia- Gold Coast or if not Brisbane — thanks — mat —

    By mathuranatha das

  77. We at the Yangquan Huaxu international trade Co. Ltd., are specialized in producing refractory bricks. As per requirements, big, bigger or small, we can supply standard bricks and special-shaped bricks for making fireplaces, baking ovens, pizza ovens and coke ovens and so on. For many years we have been manufacturing and exporting these firebricks to many countries, such as those in Europe, The Americas, Australia, etc. Our main products cover fireclay fire bricks, high alumina bricks, insulating bricks or silica bricks products. Our prices are competitive.

    If you have any questions or requirements, please do not hesitate to contact us.

    Best regards

    Contact details –
    Yangquan Huaxu International Trade Co., Ltd.
    Address: No.263,Taonan East Road,
    Yangquan, Shanxi, China
    Tel: 86 353 2020956
    Fax: 86 353 2020965

    By Sell Refractory bricks

  78. We manufacture all kinds of refractories / products in China, including firebricks for industrial and/or domestic purposes and applications.
    We offer high quality and competitive prices, a few examples are :
    Standard firebricks : 9″ x 4-1/2″ x 2’1/2″ are for USD 1.15 per piece/unit, delivered to New York or Chicago estimated at about $2.0 / per brick which of course changes to cheaper depending on quantity ordered.
    various other special brick shapes have have also available in stock on offer, like shiplap tiles, anchors, wedges of various shapes, and so on.
    Contact us if you need more extensive information. We will reply back within 12 hours.

    Cell: 0086-13838272482

    By Firebrick prices from China

  79. I was just wondering if cement pavers can be used for building an oven. I have an abundant supply of pavers (just a cement brick) from a patio that I would like to tear up and I was wondering if I could use these for building the oven. I would get proper firebrick for the hearth and dome, but was wondering if I can use the cement pavers for the remaining. I think they would be fine for the walls of the structure, but will they be ok for the chimney section? Wasn’t sure if that section gets too hot for cement bricks?



    By Patrick

  80. Does anybody have a good source of firebrick for Western Canada? I am in British Columbia and in my area, right now the cheapest fire brick I can find is $3.43 for 4.5″x9″x2.5″. Unfortunately at that price I may not be buidling an oven as the brick alone will be quite expensive. Anyone information on a cheaper source in my area would be appreciated.



    By Patrick

  81. […] metal object in guided motion will cause creation of a groove line (equally so with hard and dense firebrick which as a matter of fact also can be sanded with sandpaper as well.) However, I do not think a […]

    Pingback Soapstone properties converter | Volume | Weight | Technical Data

  82. I have searched to get information on thermal conduction coefficient of fire bricks. Your website is brilliant, extremely informative and friendly at the same time (pleasantly amusing in some sections). You can be or should be proud of it. Even openly. Thank you very much.

    By David

  83. Fire brick North of Boston (Medford, Lynn, Revere, Saugus, Salem, Beverly, Reading, Woburn, Danvers, Peabody etc. area locations) can be found here:

    Linden and Malden Cement Block Company
    Malden, MA

    Purchased 30 firebricks for $60, so about $2/brick. Had a good amount of chips but couldn’t find another place nearby that sold them. Great customer service, though. They’re open to the public and will let you buy any quantity you want, small or large. How to work with chipped fire bricks and avoid the chips easily.

    By North of Boston

  84. Can anyone say if I can buy firebricks in Bacolod. I need FIREBRICKS for a square of 1200 x 1200mm and I need them so urgent now because we were about to finish walls, the owen is situated outside but we will be cooking from the inside.

    I live in Bacolod City, Negros Occ. Philippines

    By kent

  85. Do you know if I can crush firebrick down into powder and use it as fireclay? I have bricks but it is not possible to get fireclay where I am and I need it.

    By Tom

  86. It depends on for what application. By crushing firebrick you will make the firebrick grog or dust. It will obviously remain its high heat resistant properties. Same as the data of the smashed firebrick. However, the main difference will be, if you add water you will not achieve the mud like consistency and texture (firebrick grog or dust particles won’t stick together without adding a bonding agent, e.g. would be some heat resistant cement.) Where do you plan to use fireclay, or how? If not in shops you could get own fireclay outside somewhere from the nature.

    By Rado

  87. I am in Newcastle, New South Wales and am trying to source some fire bricks. I wondered if anyone might have any information. So far I have a quote of $3.30 per brick from one supplier others are dear. I have someone else to call on Wednesday and I am contacting some recycling places to see if they might ever get firebricks in.

    This is a very exciting project and we are very keen to get all of our materials sourced so that we can commence. This is a fantastic source of information.

    Any help on sourcing fire bricks in Newcastle or advice would be gratefully received, thanks very much.

    Kind regards


    By Leanne

  88. I intend to open your plans on tablet. Could you ball park the cost of the building materials along the building plans? I’ve found a place that does fire bricks for $1.99 each, firebrick splits and fulls 9″ x 4.5″ x 2.5″ standard fire brick size from REFRACTORY plus MASONRY Products & Supplies in Seattle, WA, Salmon Bay Sand & Gravel Co., Phone number: (206) 784-1234 , Toll-Free number: (800) 774-8999. They also sell chimney liners and chimney caps among other refractory products.

    By Isaac

  89. For north Bay Area residents, I found some 9×4.5×1.25 inch firebricks for $4 a pop at the Malm Fireplace store in Santa Rosa. They don’t seem to have any firebricks at Home Depot, at least here.

    By Wes

  90. I am making a forge and need for inside appropriate heat resistant bricks blanket and ceramic shell if you can send me a catalog brochure flyer or photocopy with prices. I am a handicap and with a catalog it will be easy in my condition please.

    By richard juan

  91. To Isaac and all the personal that work with you than you and god bless all of you.

    By Richard Juan

  92. Rado, I have a question related to pizza oven materials and wonder if you would be willing to share some of your experience with me. I am going to be building a modified swishy oven only a bit larger. I was able to acquire some non-standard sized extreme duty reclaimed firebrick that are 4″ x 6″ x 9 1/2″ in length. These are 70% alumina content and have come out of a large wood kiln operated by large lumber company. I also want to put a 4″ concrete layer on top for additional thermal mass. I was reading in your post about the cladding layer about how you like to use standard clay bricks instead of the concrete. I also reclaimed ~2000 red clay brick from a demolition that are from the 1930’s. If I were to add a layer of the red clay brick would there be any benefit in putting a concrete cladding over the clay brick?

    I have an additional question about the insulation over the cladding. From my same source for the firebrick I can also pick up the 4″ thick thermal insulation blanket that was used to insulate the kiln for a very inexpensive price. Would it be better to use a insulation blanket or to use vermiculite / perlite? Could I use pumice? I have a source of that I could get for just a little cheaper than the perlite. Perlite is about $20 for a 4 cu ft. bag, the vermiculite is about $32 for same quantity and the pumice is $18. The pumice does have some moisture to it and is heavier than the perlite. Thank you for sharing your passion Rado, it is extremely valuable.

    By John Sheppard

  93. Hi John,
    Logical questions. 1st “only a bit larger” … how large the firebrick part internally do you plan to build? And A. how often will the oven be used (per week), B. what everything do you intend to produce in your oven e.g just pizzas or also baking and roasting, and quantities. That would give me much broader room for answering the questions as some answers could be handy for you.

    That is what I thought about pumice. Pumice is heavier thus having lower thermal insulting properties or qualities. But it would be excellent to be able to sit on it if in a form of a bench or a seat I can imagine. Go for the Perlite, good price too (compared with the Vermiculite in your area.) Perlite has pretty much the same properties as Vermiculite in insulating ovens to keep the heat in. Apply higher thickness especially over on the top, even if Vermiculite or even ceramic blankets were used. If you could locate and buy ash from burning coal fuel, you could use this ash instead – but recently it is all used up mostly by cheaper cement versions producers.

    If you used additional clay bricks layer in addition to firebricks, this needs to have both of the side walls supported. The side walls on whose firebrick arches sit, on skew firebricks. Supported so the weight of arches does not push on the each wall outwards. But to do some support isn’t difficult, it is just structural matter. Especially above the first firebrick arches, it is best if the secondary brick layer is bonded together with the firebricks with a thin refractory mortar. Not much mortar is used in this thin application, and this mortar helps to remove any air spaces between these two brick types. Air adds to a volume of non material mass into which otherwise the heat gets absorbs and gets retain. The air spaces between would also slow down the heat transfer within the dense material, the mortar simply connects them to deal with it all. When you reply with answers to the few question at the beginning of my/this comment, I will give you a couple more hints.

    Why don’t you build the new MTo firebrick part? And its whole system; the insulating layer under the oven and the slab and the entrance flue hood design?

    By Rado

  94. Rado,
    I was originally looking at the 3G MTO but liked the open space under the swishy better. When I said slightly larger, what I mean is building the upper part of the 3G on the swishy base so I think we are on the same page there. I want to put a BBQ smoker in the space under the oven so I need it open. Right next to the oven I will build a Argentinean Grill as well.

    As to how often I will use it, probably 1-2 twice a week, maybe slightly more. I want to be able to cook pizza’s, roast, breads, calzones, drying veggies, etc. As far as quantities, it will just be for me and my wife and our friends. Our kids are grown and moved away. So a pizza or two, flash sizzle a couple of steaks before throwing on the grill. Roast or bird for a Sunday dinner with friends. Cook a loaf or two of bread in the morning, that type of thing. As to how often we will use it, we will be using the outdoor kitchen quite often so we don’t have to heat up the house. That includes the pizza oven, smoker and grill as well as the stove I’m putting in. As far as making it a little bigger I was thinking because my firebrick is bigger and I was thinking of using the additional clay brick cladding that I would have to make it wider and I wanted to make the base 1 course of block higher to give more room to the smoker.

    I don’t think I will have it running continuously and will have a couple of cold starts a week on it. I know there is a start up cost to get the thermal mass to temp. I’ll have to figure out the rhythm of the oven so it may be easier to keep some heat in it at all times rather than cold starting it. I have the firebrick stacked on pallets right now and to see how quickly it cools down and becomes cold when then sun goes down and how quickly it heats up when the sun comes up is pretty interesting. Not just the exterior bricks on the pallet but the whole mass. I’ve checked bricks on the inside of the pallet out of curiosity.

    Thanks again for your input Rado. Really appreciate it.

    John Sheppard
    Monroe, WA

    By John Sheppard

  95. Hi,
    I have two different styles of brick. One look to be old Boston pavers and they aren’t all a uniform rectangular brick. There are defects in almost every brick. The other set are rough looking and are more uniform in size most look to be solid red clay all the way through.

    I would post a picture but I don’t see where you can do that.

    Are either of these good for a pizza oven?

    By John

  96. Hi John,
    These bricks or pavers you described they might be fine for use for brick oven hot face but the material must be the right one. So it lasts in the heat condition levels. If you need to send images the photos should be taken from the close up distance, so I can see the structure. Would be good if you cut each of the two type in half, wash the dust of and photograph the material body inside which reveals heaps more details.
    My email is kangarado at gmail dot com

    By Rado

  97. Here in the technical data there is an only accurate data for thermal conductivity at 750°C but what is the thermal conductivity at 300°C temperature?

    By Siddabasappa

  98. How many bricks in 1 cu.m each of size 9 inch x 4.5 inch x 3 inch?

    By Joseph

  99. Joseph,
    Thank you for the question.

    There are 504 bricks of dimension 230mm x 115mm x 75mm in one cubic meter volume.

    That dimension in millimeters is practically replaceable for the 9″ x 4.5″ x 3″ size brick when it comes to building, the nearest size, extremely close to 9″ x 4.5″ x 3″ but rounded. Although in USA and Europe the standard firebrick size is 2.5 inches thick instead of the 3 inches. Get all these calculations easily in this page for refractory material sizes conversions.

    By Rado

  100. Hi i live in Morayfield and want to build a pizza oven my local distributor wants $4.90 per brick any suggestions?

    By Andy

  101. Colchester Illinois has 1886 historical red clay bricks for sale. These are heavy. Extremely stout. Very clean.
    Average weight is 5.26 pounds per brick.
    Nice and suitable for all weather or fire Dutch oven, fire place. Around 100,000 bricks left. Shipping is available. Contact Mike Raleigh if interested. 309-255-7943. Text and email work too. Thanks

    By mike

  102. Which type of gas generate while mixing the refractory and water? And What is the Chemical reaction of it?

    By Jatin Dhingra

  103. Steam, it is gas also. Only heat out of the reaction and pH might rise slightly. So you might see steam or evaporation/condensation maximally to be non scientific. Upon the water is added, ions form during the early reaction if it’s a refractory cement; firstly hydroxide ions create. Crystallization of the calcium hydroxide begins and calcium silicate hydrate starts forming simultaneously. As the reaction accelerates of course the ions precipitate within the mix totality. The heat still keeps increasing for a while and can be measured by the kJ energy unit and perhaps it could be calculated as well.

    By Rado

  104. I’ve been looking for firebricks in Qatar but with no luck, the local clay brick company have told me that I could use the red clay brick they have available but I’m a bit of a skeptic as I couldn’t get a hold of their composition. However, I found a refractory manufacture from the nearest country that would be able to ship, but in their composition silica is not listed at all. Would these bricks be OK to use in a pizza oven? – particularly for the base?
    below is the composition they have:

    Al2O3 % – 36
    Fe2O3% – 1.70
    A.P% – 24
    B.Dgm /cc – 2.15
    CCSKg/cm2 – 300
    PLC% – +/-0.30
    P.C.E (O.C) at 1450°C – 32
    RUL (Ta) °C – 1450

    Would appreciate your help!

    By Heba

  105. I’m really keen on building a pizza oven. Currently residing in Qatar, where it seems to be completely dry of firebricks/refractory bricks. Found a company in a neighboring country that sells Alumina bricks but does not mention anything about silica. They carry 40% alumina with 1.21 % iron oxide and A.P % 21. Should I go ahead with these bricks or are they not suitable?

    By Heba

  106. G’day Heba,
    Data from your fist post (but the 40% alumina will be all right too): The bulk density 2,150.00 kilograms (2,150,000.00 grams) to cubic meter, calculated from the B.D. gm/cc – 2.15, seem fine numbers for heavy dense refractory firebricks. Judging from the 36% alumina content in the clay these bricks will contain roughly 60-65% silica. Apparent porosity, AP 24%, reflects the data correctly.

    How much do they cost you, where are you importing them from, which country? It should be easy for you to bring a palette of firebricks etc. to Qatar from some other country around you and perhaps for a real low price too if the firebricks are purchased right from a manufacturer. Here in Au. we have heaps of imported refractory firebricks available as well, then re-sellers ask arm and leg sort of a markup for them.

    By Rado

  107. Hi Rado,

    Thanks for your reply! I’ve been on a maniacal internet hunt for the nearest fireclay bricks- definitely no luck with finding them locally. Did come across a reseller, who for obvious reasons did not have anything in stock (seems far too usual when you live in Doha!)

    From the first post, I found the composition on a trading site from a manufacturer in Saudi, but upon emailing them, they only had bricks of 40% alumina and above. They haven’t gotten back to me with a price yet. But judging by the price of the local red clay bricks in Qatar (roughly 1.25 AUD per brick) I wouldn’t be surprised if they ask for an organ for the fireclay. But I shall remain hopeful!

    On my ongoing search I have found another factory for refractories in the UAE that have a proper PDF datasheet online:
    I’ve requested for the pricing for the RM 30 ( AL203: 29%, Si03: 63% ) not very sure on the application description : Expandable product. Im hoping the composition itself is enough to mindfully start on the pizza oven!

    By Heba

  108. Hello Rado,
    I was able to get a few cases of new light weight “Refractory” bricks that were intended to be used in a high temperature Kiln. I believe I have enough to construct the arched ceiling of an oven and easily cut them with a table saw to obtain the correct angels without any mortar. However, the person I got them from said “their properties are intended to reflect heat more than adsorb it.” Will these be acceptable for a pizza oven or will they not retain enough heat to be effective?
    Tank you,

    By Paul

  109. Paul,
    Be careful here because the oven would not function. Lightweight firebricks would not absorb and therefore also not retain the heat energy in them. Basically nearly not at all, compared to the heavy dense firebrick kind which absorb heat real well.

    But on the other hand you could use them for under the hearth floor slab for instance to prevent the heated floor from cooling down. They are truly great for insulating the heat as in keeping it inside the oven, or keeping the outside cold condition separated, but must be only applied in places where suitable. These bricks are also expensive especially when new, say even 5 times compared to dense firebricks, so take all of them if you can get a good price!


    By Rado

  110. Good day Rado,

    Good to see you still providing great advice and service online. People may not know that Rado was the original traditional oven website, years before all others.

    You recommended to Australian builders CLAYPAVE as suppliers of refractory brick. Probably in response to all the inquiry you generated, and your own material usage, now they offer a complete pizza-oven kit for new builders. It comes complete with pre-cut bricks and insulation etc. Claypave pizza oven the lot.
    I do not know if it is barrel or circular dome design, nor the price.

    Keep up the great work!

    Pieter in Sydney

    By Pieter

  111. The size usually is 230x114x65cm, we can also make 230x114x75cm. KrefRactory

    By Krystal

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