I'm thinking of building a round oven on the side of an existing stone foundation. The bakery will end up being on one side of an existing basement(lower level). I'd like to dig away and then build the oven at the correct level for use inside and then cover it all up again??? Sort of like an old city bakery on a lower level... As I'm also heavily interested in bread, how would the natural thermal mass of earth on all sides of the oven affect the oven heat? Does anyone have any experience with this?
Keep it dry
Idealy, the oven should be so well insulated that it won't know whether it's next to air, masonry, or earth. An important point: Stone foundation implies an old foundation. Most old foundations I know about are almost always damp. You probably want to work with the sort of thick plastic used for moisture barrier to keep your oven dry. If you had to drive the ambient dampness out of an old foundation on every firing, you'd have trouble attaining and keeping pizza temperatures.
Wow! Sounds like you have a great deal of excavation ahead of you if this basement is completely underground. Not only do you need the area of the oven footprint excavated but room on all sides to work, plus extra room to shore up the dirt to avoid collapse while you work. Will you remove the existing basement wall, (or a large section of) while you build the oven? Seems like you'll need to do that too which of course requires some sort of beam in place to carry the load above.
The finished product would be great though! I'd expect the earth would be fantastic insulation. As dmun suggested, moisture might be a real concern. Also, what part of the country do you live in and how much soil shift do you encounter?
"Das Alte Backstube"
There are some pictures in black on white of the underground oven at
and at http://www.backstube.at/ambie.htm
A great old wood cut of the round oven can be enlarged by clicking on the thumbnail at http://www.backstube.at/museu.htm
(M) All text is in German but the pictures are a good indication of where your basement excavation could lead ;)
Zehr gut, mein Herr. Great woodcuts, fine restaurant. Must be fond memories for you.
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