Vapor barrier in the ceiling

[okaenrique]

It doesn't look like a vapor barrier to me. On the other hand, I can't say what it actually is either. Maybe some kind of vapor brake?

I was thinking of replacing the inner ceiling, should I install a vapor barrier or stick with the existing one?

 

[Tompafix]

If you lift the insulation in the attic, you should see if it's plastic or not. Hard to see through a small hole. Or you check after you've taken down the ceiling.

 

[okaenrique]

Here is the picture, do I need a vapor barrier or should I apply gypsum directly on it?

 

[TheGame]

That's how I have it at home above the original ceiling.
It's a very thin plastic.
So yes, if you've removed the old inner ceiling and the black plastic came off with it, you should put new plastic in the ceiling.

 

[okaenrique]

The black plastic is still there, I have only taken down the inner ceiling.

 

[Nissens]

I was thinking of replacing the interior ceiling, should I install a vapor barrier or use the existing one?

I would probably install a proper vapor barrier.

 

[okaenrique]

I would probably install a proper vapor barrier.

Ok, I will use 0.2mm. Do I need to put it on the wall as well? It's OSB, and I was thinking of putting drywall directly on it.

 

[TheGame]

Ok, I will use 0.2mm. Do I need to put it on the wall as well? It's OSB and I was planning to put drywall directly on it.

Exterior walls and ceiling yes.
But not between etc. and drywall without the insulation and osb.
Wasn't there plastic there when you opened the exterior wall?

 

[okaenrique]

Outer walls and roof, yes.
But not between etc. and gypsum, only the insulation and OSB.
Wasn't there plastic when you opened the outer wall?

Yes, there is plastic and old barrier from the 70s, but I thought I'd go with a proper vapor barrier. It will be difficult with outer walls because there is already OSB and I don't want to remove them; I'll drywall directly on them.

 

[TheGame]

Yes, there is plastic and old barrier from the 70s, but I'm planning to use a proper vapor barrier. It will be difficult with exterior walls because there is already OSB, and I don't want to remove them; I will plasterboard directly on them.

If there is already plastic behind OSB, you should not put a layer between the OSB and plasterboard. If you skipped the plastic behind OSB, that's a mistake. I don't know if it can be compensated by adding it between the OSB and plasterboard, but I wouldn't have done it without removing the OSB and doing it correctly.

 

[Jonatan79]

No, you don't need a new barrier in the ceiling or to tear down the walls and put something there. Make sure to seal any holes in the ceiling with proper (expensive) tape.

 

[TheGame]

the black plastic is still there, I have only taken down the inner ceiling

Missed this post, no, you don't need to install new plastic if the old one is still there

 

[okaenrique]

Missed this post, no you don't need to put new plastic if the old one is still there

This is how it looks right now

 

[TheGame]

This is how it looks right now

Yes, that's how it looks above my ceiling too, it's very thin brown paper, then thin black on top.
If it's intact, just put plaster on, tape any holes well