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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.
Not particularly worried about tying the slab down. The slab itself will weigh about a ton, and will have maybe 3 1/2 tons of oven on top of it (1000 bricks = 5000 pounds, more or less, plus the sand insulating barrier between the oven and the outer walls) , plus a few hundred more pounds from the wall and extended roof section on top of that. I don't expect it will be going anywhere.
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