OK I have tried 3 time to post this. Hope this one posts. Anyway I was wondering about insulating board for under the oven floor. I read somewhere that if the board get wet it tends to disintagrate. I thought about wrapping the board in aluminum foil to protect it from moisture. I am worried that the concrete stand will "sweat" and deteriorate the board causing the oven floor to fall. Any thought? Also is fireclay the correct mortar or should I use something else? Thanks.
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