Now, let's ignore the asbestos perspective.

Was it common to have interior walls made of plasterboard that were then directly wallpapered in the past?

Let’s say that what you see in the pictures now is a "regular" old plasterboard that may have been supplemented with gypsum plaster. And some brown material, it seems to be directly on top of the plaster, i.e., closest to the wallpaper. Maybe the brown part is part of the plasterboard itself (paper), what else could it be, I wonder? It seems odd to have affixed a thin brown material directly on the plaster, doesn’t it? Did people do that in the past? To use as a base for wallpaper on top of the plaster?

Was it common/likely in the past to build up interior walls this way, with plaster, to create a flat surface for wallpapering? I'm thinking specifically about whether interior walls were generally constructed this way in the past, or if you think this was done specifically because the chimney is inside and the other interior walls were made differently? Were you required to put plaster on a chimney back then, instead of another type of interior wallboard? Thinking from a heating perspective among other things. But how did they attach the plasterboard or other wallboard on top of the chimney in that case? Screwed on? Glued?

I have a chimney with wallpaper in several other places in the house, do you think the wallpaper is applied directly on the chimney, or did they always use some other material under the wallpaper? When I tap on the wall at the chimneys in other places in the house it feels very hard and solid. Therefore, I doubt there is any form of wallboard between the wallpaper and the chimney in these spots. But shouldn’t you be able to see if the wallpaper is directly on the chimney, I wonder as well? Or perhaps they used some kind of filler to smooth the surface under the wallpaper instead of a wallboard or plaster?
 
S
From 1965, gypsum began to be nailed on the framework. It takes a lot of spackling to achieve a smooth surface on a brick or cast wall.
 
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Stina71
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SBH, am I understanding you correctly...

You mean that instead of trying to plaster a smooth surface on a brick or cast wall, etc., in order to, for example, wallpaper the chimney, people chose instead to nail up plasterboard? On the chimney? Am I getting this right?

What do you mean by nailing plaster on a stud frame?
I have no knowledge in this area, so I would appreciate an explanation...
Stud frame, in wood? How/where do you mount one in a wall by the chimney?

So in the 60s, could one nail wooden studs and plasterboards directly to the chimney?
So it was okay with "regular" plasterboard, without asbestos mixed in as fire protection?
Could plaster be added to the plasterboards afterward?
Why, then? Purpose of plaster? What was plaster used for?
I have no clue about this either...
:)
 
SBH, so if you've nailed drywall to a stud wall by the chimney, then the rest of that rather long wall should also be the same drywall and stud wall, even where there's no chimney underneath. The wall is smooth all the way, after all. Haha, tricky ponderings, but grateful for input from a true layman... It should be the same boards under the wallpaper on the whole wall, right? :)
 
J
Be glad you live in such an old house, back then it seems like the number of unpleasant substances was much fewer. But of course, in the eagerness to modernize, some "new" materials might have been introduced. It’s unfortunate that asbestos was added to almost everything... But as long as you don’t disturb it, there shouldn’t be any danger.

Many times, an eager renovator has probably just nailed over all the old with a modern board, whether it's tretex or plasterboard depends on when it was done...

Plasterboard is quite a new invention. Previously, they often panelled, papered, clay-rendered, or plastered the walls to make them smooth. In our entire house (1909), the walls and ceilings are plastered with lime plaster. A much more vibrant surface than plasterboard.
 
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Stina71
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Hello JohanLun!
Thank you for your feedback! :)

What materials do you think of when you see my pictures at the top of this thread?
Both regarding the lighter materials and the more brownish ones?
The brown is visible both in the pictures of the wall itself and in the pictures where I photographed the material lying on a red plastic folder.
I'm not sure if it might be several different materials, both the white and the brown.
I'm so damn annoyed with myself since I must have thrown away the material I photographed, and now the baseboard is in the way of accessing the materials to send for analysis. At the same time, there's quite a substantial gap between the floor and the baseboard, due to an uneven floor, but not big enough to access and extract material. But, I'm afraid, it's a large enough gap for potentially unsuitable dust, via drafts from the floor joists, to enter the indoor air through the gap under the baseboard. Dilemma... :)
What would you do?
 
I definitely think it looks like plasterboards that have been glued up with plaster adhesive. I have done this myself on an uneven plastered wall with good results.
It looks like there is plaster adhesive on the small loose piece.
 
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