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I built my oven. Made the insulation layer with Kiko suggestion of large wood shavings and clay. Did not put final layer on it yet which will be a lime plaster. Have fired it up a couple of times and made pizza and bread. I stopped using it because the opening of the oven at the arch has started to burn and desinagrate. The benign has continued toward the top. It seems the insulation is burning. I did a repair with straw, clay and some sand but it continue to burn. Has this happened to anyone else?