Vapor barrier or retarder in a house from - 67

[Akronym]

Hi, I wasn't quite sure which forum section to put this in.

I'm working on a renovation that has grown a bit larger than intended. The house is a terraced house from 1967 with a brick facade. In conjunction with switching to Nivellgolv, I've removed all the wall coverings in the kitchen, hallway, and future bathroom. I'm now considering whether to install a vapor barrier or vapor control (or neither) before putting up the new drywall.

The construction was originally from inside out:
Wallpaper
Masonite
Tar paper(?)
Tongue and groove boards about 30mm thick

I'm unsure about the rest since I haven't torn it all the way out, but I guess it's insulation, wind paper, furring strips, air gap, and then brick.

Above the rooms, there is also an attic that extends about 3m over the ceiling. I think I should have a vapor control there as well in the ceiling, and if so, should I have vapor control for the entire ceiling or just where it's cold above? Currently, the ceiling is: Tongue and groove boards, wind paper(?), sawdust, and then the attic floor.

 

[Jonatan79]

A vapor retarder is sufficient for walls and ceilings, in bathrooms it's good to have plastic/vapor barrier to prevent moisture from reaching the attic. If the attic is in good condition today, you should not change too much.