I have a small problem with how to proceed in fixing a wall on the upper floor.
Above the stairs (U), the wall continues upward with the chimney and the side of the wardrobe at the bottom of the U. It currently looks a bit unfinished with the plaster on the chimney combined with the wallpapered wardrobe that doesn't quite reach the ceiling.
I would like to place some board over everything so that it looks like a regular wall but don't know what to choose. To the right, it will be "open end" with no corner, so I figure it would be difficult to make gypsum look good? What other sheet materials are suitable? About 10 mm can fit without major follow-up problems. (To the left, there will be a regular outer corner, which I can handle)
If the chimney is in use, it might be good to consider the material with regards to the fire safety inspection.
How wide is the surface? Will the boards need to be joined?
10mm does offer a rather narrow range of boards. For example, fiber gypsum exists but is 12.5mm thick.
Yes, it is used. This was also a consideration regarding how the regulations look there. I have checked it after we have had a fire going for a long time, and you can barely feel that it gets warmer than the surroundings. It is now just for a cozy fireplace after the oil boiler was removed.
Boards about 15 mm thick could probably also work. The total width is about 1600 mm, so a joint is likely unavoidable?
Yes, it's used. There was also a question about what the rules are there. I've felt it after we've had a fire going for a while, and you can barely feel it's warmer than the surroundings. It's now only for a stove for cozy fires after the oil burner is gone.
About 15 mm thick panels could probably work too. It's about 1600 mm across the entire width, so some seams are probably unavoidable?
Fire safety inspections can be very dependent on the inspector.
So I would have installed a non-combustible panel.
There are other non-combustible boards, but regular plaster seems like the first choice, yes...
I was thinking more about the fire safety inspection... Maybe a good idea to check there, considering the closet stands with the wall against it, which then cannot be inspected. My parents had to put in an inspection hatch in a closet that stands against their chimney. It had been like that for over 50 years, when suddenly an inspector decided it was no longer approved...