Fio:
Please describe the oven you are building (size, materials, shape, etc.) Thanks.
Bill/SFNM
The design is based on Alan Scott's wood ovens described in his book, "The Bread Builders."
It will have a cinderblock base, solid, with no ash slot (no need when baking pizza). The hearth will be insulated with Unifrax board. The hearth and dome will be lined with cinderblocks, clad in concrete, and covered with vermiculite insulation. I will probably house it in brick walls with some kind of pitched roof.
Here is a picture of the type of construction I am planning: