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Weekend_Sawyer and 1 Guest are viewing this topic.
It is important for baking to shut off the exhaust port when the fire is scooped out, so your heat doesn't all escape out the top of your oven. SO maybe that's it, put the exhaust ports right out front so it's easy to cap them off.
The tar paper will isolate the wood supports underneath from the concrete, so it won't make it rot out. It also is there to stop the concrete running down through the various cracks, gaps, holes, etc.
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