Vapor barrier when replacing ceiling drywall

[Maxoz]

Hello,

We have torn down a built-in wardrobe where the ceiling was around the wardrobe, so now we need to replace the entire ceiling as well.

The question is whether one should install a vapor barrier against the ceiling boards before the plasterboard, or is it negative? There are some older signs of moisture transmission to the attic, but it's only on the north side, old and from before we changed the ventilation.

Also wondering if it matters which ceiling plasterboard is used, is it just as good to use thin renovation plasterboard as regular ceiling plasterboard?

Looks like the images below today where everything is to be torn down.

 

[datja]

Hello,

We've torn down a built-in wardrobe where the ceiling was fitted around it, so now we're going to replace the entire ceiling as well.

The question is whether one should put a vapor barrier against the ceiling boards before the plasterboard, or is it negative? There are some older signs of moisture leakage into the attic, but it's only on the north side, old and from before we changed the ventilation.

I'm also wondering if it matters which ceiling plasterboard to use, is it just as good to use thin renovation plasterboard as regular ceiling plasterboard?

It looks like the pictures below today where everything will be demolished.

[image]

[image]

How old is the house?

Is there a vapor barrier in the rest of the ceiling?

 

[Maxoz]

How old is the house?

Is there a vapor barrier in the rest of the ceiling?

Hi,

The house is from 1965 - haven't seen any vapor barrier where we renovated.

 

[Karl-Ove Qvarfordt]

Use regular 13 mm gypsum, cheaper than rotgips. And it's not that easy to install on the ceiling I would imagine.

 

[datja]

Hi,

The house is from 1965 - haven't seen any vapor barrier where we've renovated.

In that case, it's pointless to have a plastic strip where you're renovating.

 

[Maxoz]

Yes more if one over the years replaces several ceilings and does the same. But I'll probably skip it because it's doubtful we'll replace several ceilings in the coming years.

 

[fribygg]

Renovation gypsum is a hard-to-screw and hard-to-fill emergency solution that should only be used where standard gypsum doesn't work. Use regular half-inch standard gypsum or special ceiling gypsum.

 

[Maxoz]

Hello again,

Thank you for the responses! One more question:
Is it usually okay to screw the gypsum directly into the råspont/inner ceiling (see the picture in the first post) or does it need to be in the ceiling joists?

The previous ceiling panels were much lighter than the gypsum.

The råspont/inner ceiling seems to be just under 20mm.

 

[tergo]

Is it usually okay to screw the plasterboard directly into the raw wood/ceiling (see image in the first post)

Yes, but check how well the raw wood is nailed.