Thanks Glenn, for your insights. Maybe a few too many uncertainties with the cob layer solution, right? Hopefully I can find some tiles in a better condition.
The back of the tiles cause problems too, which would need the same treatment. Would it be an option to redo the cob application every other year? The diameter of the inside of the oven will be 24 inch, so not a lot of surface to redo.
I found donor floor tiles for my to build wood fired oven. It was used for over a century in an old French farm. The top of the tile is kind of damaged. Can they be saved for use, for example by applying a thin layer of cob?
