Why fasten on the parquet? If the wall is stable (hence the suggestion of an OSB board) and attached to two walls and the ceiling, it will not move a millimeter. In apartment buildings, extra walls are often built with steel tracks with a polyethylene backing against the floor and ceiling to be able to remove them later.
Hello again! No, I would have preferred to do as you wrote, AHolst, but I will need to extend the corner from the trellis (wall 2) about 95 cm out, and from there the new cross-wall (wall 1) will go over to the opposite side. This makes me a bit worried about the stability of the wall if I don't secure it, at least a little, to the floor.
Now another thing strikes me, which you might be able to help me with; it will be single plasterboard in 2.5-meter lengths that will be screwed to the trellis on the side facing the stairs. The ribs/studs that make up the trellis meet the basement staircase wall surface to surface, which means if I screw the plasterboard to the studs, it will hang in the air on the plasterboard screws. Should I attach a neat cross-list beneath on which these plasterboards will rest at the bottom, or is it okay for them to hang in the air on the screws, so to speak?
The question might be silly, but I'm happy to accept any correction through clarification. In the few cases where I've built interior walls so far, I've always had situations where the screwed plasterboard stands on the floor or somehow rests on a sill. I haven’t yet installed plasterboards that end a bit up in the air without something to support them from underneath.
If you look in the right corner of image number 3, you might understand my thought process.
Thank you very much in advance/ Jörgen
Now another thing strikes me, which you might be able to help me with; it will be single plasterboard in 2.5-meter lengths that will be screwed to the trellis on the side facing the stairs. The ribs/studs that make up the trellis meet the basement staircase wall surface to surface, which means if I screw the plasterboard to the studs, it will hang in the air on the plasterboard screws. Should I attach a neat cross-list beneath on which these plasterboards will rest at the bottom, or is it okay for them to hang in the air on the screws, so to speak?
The question might be silly, but I'm happy to accept any correction through clarification. In the few cases where I've built interior walls so far, I've always had situations where the screwed plasterboard stands on the floor or somehow rests on a sill. I haven’t yet installed plasterboards that end a bit up in the air without something to support them from underneath.
If you look in the right corner of image number 3, you might understand my thought process.
Thank you very much in advance/ Jörgen
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The last time I used such tape, I think it was from ÖB or Biltema....also make sure to set the vertical studs a little under tension....
It's fine to let them "hang in the air," in my experience, drywall can hang on a single screw, so if you follow the standard with 20cm between screws, they won't fall down. I personally have ceilings 272-275cm high in some rooms where I have installed 270 drywall with a small gap without any issues, (with a 14cm baseboard and a 12cm crown molding you can cover a lot of gaps 
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)Exactly right....1-2mm maybe....then screw diagonally into the stud that is in the ceiling and the floor.....kinshasa said:Thanks to both of you - I have a pretty clear picture now
@ Enk; with pressure - this means that the standing studs are so long that you have to force them into place between the base plate and the ceiling with a bit of force, right?