I am going to cover my walls with construction plastic. I've been thinking about how to finish it at the floor. Should I cut it clean a few cm above and tape it to the stud? Or should I make it a bit longer so it ends up under the inner stud that will be built on the outside as an installation space?

Room under construction with window, exposed insulation, stacked wood panels, tools, and cables on the floor.
 
You should pull it down and attach it to the concrete. If you are installing parquet flooring, you can advantageously extend it a bit onto the floor to connect it to the plastic underneath the floor.
There are special sealing materials to make it tight against the concrete.
 
Matti_75 Matti_75 said:
You should pull it down and attach it to the concrete. If you're going to have parquet flooring, you can advantageously let it extend slightly onto the floor to connect with the plastic under the floor.
There are special sealing materials to make it tight against the concrete
it is not concrete. It is chipboard screwed onto floor joists. (Floor2).
 
Okay, then you have to try to align it with the plastic in the wall on the ground floor.
 
Matti_75 Matti_75 said:
Ok, then you must try to connect it with the plastic in the wall on the ground floor.
Impossible. Built-on upper floor. What I can relate to is what's in the picture. Either fold out the plastic on the floor or cut clean and tape it to the lower wall stud. An inner wall is being built on the outside, which will be placed on the unfolded plastic if that solution is chosen.
 
I interpret it as if you have plastic in the ceiling on the ground floor. Then the alternative is to join the upper plastic with it. Otherwise, you will have a hole at the intermediate floor where moisture will find its way into the construction.
It is always problematic to add on to a house. Therefore, it is important to think everything through carefully before starting so that things are done in the right order.
 
Matti_75 Matti_75 said:
I interpret it as if you have plastic in the ceiling on the ground floor. Then the option is to get the upper plastic together with it. Otherwise, you will get a hole at the between-floor joist where moisture will find its way into the construction.
It is always problematic to extend a house. Therefore, it is important to think everything through carefully before you start so you do things in the right order.
No plastic in the ceiling below. We have basically torn off an old gable roof, exposed all the floor joists. A combination of old sawdust and new mineral wool in the floor. (Outer edges and compartments where we have embedded installations/ventilation etc. is wool). On that, we have laid chipboard over the joists. New exterior walls and a new shed roof.
 
If it's an old house, there are probably enough leaks in other places. Try to connect as built as you can only
 
If you have no plastic on the downstairs, just do as you planned and clamp it under the installation rule.
 
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Matti_75 Matti_75 said:
If you have no plastic on the lower floor, you can just do as you planned and clamp it under the installation rule.
I think I will put a bead of sealant between the rule and plastic before I clamp it. That way, I've definitely sealed the plastic against the room/lower floor. In case it would be sensitive to air from the joist/floor below getting in behind the plastic!!!
 
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