chimney vent and insulated hearth issues
I’m a first timer, an inexperienced builder and mason. Can someone help me with my issues…hopefully their not problems.
1. My vermiculite/cement poor swelled upward about ¼” overnight. What happened? Do I just scrape or sand the oven floor to make it level?
2. The surface skin also blistered in places making the surface skin crumbly. What happened? Do I lay my oven floor bricks directly on the now level crumbly surface? Is setting the bricks into a fireclay skim important?
3. Is the chimney vent immediately above the inside or outside perimeter of the oven dome?
That’s enough to get me to the next question.
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