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Concrete or more typically some kind of (concrete) brick, then plaster, then wallpaper, then paint.

At least in many German houses.

well that's drywall no? the sheets of plaster between the wall and the wallpaper

Plaster can be very thin and it isn't sandwiched between sheets of wallpaper. It's used to smooth out the wall texture.

You can also have concrete wall with plaster and then on top of it paint, no wallpaper at all.

Standard way to build here for the last 50 years. Indoors, the raw brick or concrete wall has a thin layer of "flattener" plaster spread. No drywall pieces.

Most of the time no wallpaper.

Presumably they mean just plaster, not sheets of plaster board.

exactly ;)

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