The house has log walls, with paneling directly on the outside, and on the inside, there was clay plaster that had come off, and behind that, Tritex boards. The Tritex and clay plaster are gone, but what should be put on the walls inside so that they can be painted/wallpapered? Gypsum sounds like a good choice, but the question is whether it allows moisture to pass through and lets the house breathe; perhaps there is another type of board that can be used?
Gypsum is not particularly diffusion-tight at all. But it wouldn't matter if it was. The house does not need to breathe in that way, meaning it is not important for the wall covering to allow moisture from the room to pass into the wall. In fact, it's better if it doesn't do it.
Plaster is absolutely perfect for what you need it for.
Or you can re-coat with clay. It's a lot of work and results in a less even wall, but it is more resistant to draft and can be considered more beautiful by some. Myself included.
Or you can re-coat with clay. It's a lot of work and results in a less even wall, but it is more resistant to draft and can be considered more beautiful by some. Myself included.