Another wierd thing my mason did was build a slight slope to the rear left corner of the dome. He did this because he said it was a traditional addition he learned from watching other ovens built. He said the reason is really for final fire placement. It allows for the ashe and firewood to stay in one place while fireing and cooking. I know there are tools for this now and various guards. Again I questioned this and he just told me to trust him.
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slope of hearth