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Post by Solomon on Jan 6, 2021 21:47:49 GMT -8
Designing my 8" Ernie and Erica style J tube. Combustion unit will be sitting on a basic concrete slab floor.
The book seems to say I can get away with one inch of ceramic fiber board under the single course of brick that constitutes the floor of the combustion unit.
Is this correct?
What have you used and what do you suggest? How hot can concrete get before it starts to degrade?
Thanks.
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Post by martyn on Jan 7, 2021 0:36:42 GMT -8
I am not sure about the exact figures but that seem a bit lean to me I would use 2’’ plus rather than heat up a huge heat sink of concrete. I can tell you that in the pizza oven world, the recommended minium ’is 2’’ and the optimum is 4’’ under the brick cooking base. On my own pizza oven I used 4’’ of ceramic board and when the top of the bricks is at max temperature of around 550c (1000f) after about four hours of burning the heat will penetrate through the fire brick, through the ceramic fibre and even through the 4’’ concrete supporting base ... however the underneath of the supporting base will only be around 80f
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