I am in the process of building my WFO and have found this fourm the other day and saw on here that some put the Vermiculite base on top of the hearth. I was planning on putting mine at the bottom in a Vermiculite / Portland Cement mix of 2" them pour the other 4 1/2 part of the slab in conrete and then putting my firebrick on the side for the bottom of the oven. Not sure the differnece? Wondering if anyone had any advice on this
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Concrete hearth--Vermiculite on top or bottom??