Hello there, I have finished my oven and tried it out a few times. the floor is fire bricks on top of 2" of castable insulation sat on top of 4" of concrete with a cavity under to provide storage i have noticed after been up to temp for a while the underside of the concrete gets up to 54*C (130f) is this normal ?? seems a lot of heat loss to me. Could i place a sheet of kingspan under the concrete to insulate it ??. I also (like a fool) ! let my 4" concrete oven floor into my blockwork by 1" so when hot i get the tiniest of cracks going 6" down the back wall of the base ! but when cool disappears again am i worrying too much?. Any comments would be appreciated
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