Is this metal?

[gjbingham]

I don't think that is cement board in the photo (or backerboard/Hardiboard as we call it around here). Those will hold almost no weight. They are not meant to be structural beyond being mortared to a solid surface and then having tile placed on them. If I'm mistaken about your definition of backerboard, then just ignore me.

Whatever the material is in the photo, the builders have obvious faith that it can be lifted off the palate and placed without breaking. Hard to imagine.

Xjim sees a lot of prefab ovens in Spain. I wonder if they look like this?

[Ramiro]

Ok, but for example, what kind of board are they using in this video?

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[karl]

It looks like a platform specifically used for exhibition purposes. There seem to be seven steel/aluminimum bars layed on two side beams with some kind of a thin cement board (not a structural member) on top for providing a smooth building surface.
I am puzzeled by the fact that he does not show the removal of the wood support bars he put in at the start and that he use sheets of newspaper(!) as a kind of insulation around the door. Maybe they just combust to ash inside there without any damage?

karl