Hello!

I'm working on a basement renovation. The conditions are as follows:
I live in a townhouse, and the current basement room has two walls facing neighbors, one wall facing a culvert, and one facing the outside. The basement is drained, insulated, and has embedded water-based underfloor heating. I have just sanded down plastic paint, knocked off loose plaster, and replastered with lime mortar. Otherwise, the basement is dry, but I will review the ventilation in due course.

Now I want to build an interior wall that will go between the outer wall and the culvert wall. I'm planning to use steel tracks as bottom and top rails, and have steel studs where the interior wall connects to the plaster walls. What I'm wondering is how I should deal with the OSB and drywall that will "connect" to the plaster walls? I'm considering creating an air gap, but then I wonder how I achieve sound insulation here? Should I apply a special sealant?

Thanks in advance!
 
I would skip the OSB boards and rather install double drywall.
If you're concerned about sound insulation. But why, in a basement space?
 
KnockOnWood KnockOnWood said:
I would skip the OSB boards and rather use double plasterboard.
If you are concerned about sound insulation. But why, in a basement space?
I choose OSB boards as a staircase from the upper floor will partially be mounted in the wall...

The room will be used as a guest room, hence I want to make it quiet. At the same time, I don't want the plasterboards to be attached flush against the outer wall.
 
You can always place a rubber mat strip behind the metal studs that is wide enough to also seal against OSB and gypsum. Otherwise, more info is needed about the execution of the adjoining walls.
 
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mefi
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J justusandersson said:
You can always place a rubber mat strip behind the metal studs
Yes, it's maybe time for something like this:
Syllisolering.jpg
 
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mefi
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That was smart, had one of those "why didn't I think of that" moments..! Can you place it about half a centimeter shorter on each side of the wall, and then seal the gap between gypsum and plaster you think?

The exterior wall is made of hollow concrete with lime plaster on it.
 
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