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Post by ajstimpson35 on Apr 10, 2020 10:07:02 GMT
Good morning everyone, please be kind this is my first post!!
I'm looking for some advice, i'm building a wood fired oven in the back garden, i've got the base made ad am about to start the oven itself, i was wondering if i could use ordinary bricks to build the dome and then line the oven with vermiculite slabs that you would get in a log burner, as i have plenty of both of these and would like to use them if possible rather than buying a load of fire bricks. If anyone has any thoughts or ideas please let me know.
Thanks, Andy.
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Post by downunderdave on Apr 11, 2020 22:00:20 GMT
Good morning everyone, please be kind this is my first post!! I'm looking for some advice, i'm building a wood fired oven in the back garden, i've got the base made ad am about to start the oven itself, i was wondering if i could use ordinary bricks to build the dome and then line the oven with vermiculite slabs that you would get in a log burner, as i have plenty of both of these and would like to use them if possible rather than buying a load of fire bricks. If anyone has any thoughts or ideas please let me know. Thanks, Andy. First up you need to make sure that you insulate between the supporting slab and the floor bricks. Failure to do this results in heat loss from the floor.While you're about it some holes right through the supporting slab are a good idea so moisture from the insulation can escape.You may be able to use your vermiculite slabs as floor insulation. The normal required strength is 5:1 vermicrete which is adequate for strength and 4" of it provides sufficient insulation. Attached is a table of strength vs insulation value you could use to compare to the strength of your slabs if you can find strength data for them. Regarding your question about dome bricks, lining the inside with vermiculite slabs is not a good idea as they are insulating and will slow heat from getting to the dome bricks. This means greatly increased heat up time as well as presenting a weak surface that is subject to bumps and abrasions. Ordinary solid red bricks are usually ok for the dome (but no guarantees). They are not suitable for the floor bricks though and are highly likely to spall and or crack if used there.
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Post by oblertone on Apr 13, 2020 13:04:50 GMT
FWIW I used ordinary bricks that came from a 200yr old chimney on the house opposite (they were taking it down) and to date they've been fine. Try to avoid bricks with 'frogs' and use solids where possible. Use vermiculite slabs under the floor and get storage heater blocks to make the cooking floor. My build thread is below for info.
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Post by ajstimpson35 on Apr 13, 2020 16:14:41 GMT
Thanks for your input guys,it's very much appreciated, you say avoid using bricks with "frogs" in them, how about block paving blocks for the dome, do you think this would be OK?
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Post by oblertone on Apr 13, 2020 19:06:17 GMT
Sorry, 'Frogs' are the indents found in modern bricks to hold cement, use solid bricks if possible which you can often find in reclamation yards. As you'll be cutting/splitting them in half damaged solids are fine and cheaper. Block paving are made from concrete and not fired therefore they'll crack up when exposed to heat and drop non-chewy bits in your pizza.
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