 Re: Started new oven - Vermiculite versus insulboard
Two inches of cal-sil board or four inches of vermiculite concrete are what's called for in the plans. The high tech board is a slightly better insulator, thinner, and easier to install. I just placed my boards on the wet concrete of the slab and put my floor bricks directly on top of that. You can add more, or do both, at your choice, but either one should do the job.
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