Drywall in the walk-in closet

[tuokaya]

The closet has somewhat thinner walls and air comes in from the ceiling, making it very cold in the winter. In the picture, you can see that the ceiling panels do not reach the outer wall.

I'm thinking of installing drywall and sealing between the wall and ceiling panels, plus making the wall as thick as the bedroom.

Is it okay to install regular drywall on such outer walls, or can it lead to mold?

The ceiling and walls are original from the 50s, with plastered facade and blue concrete.

Attaching the pictures.

 

[tuokaya]

Or is there another solution for sealing the roof against the wall?

 

[Jonatan79]

A layer of plaster will not noticeably affect the heat in the summer or the cold in the winter; it's if you want to decorate with paint or wallpaper that plaster is beneficial.

 

[tuokaya]

What do you do with tretex panels that don't reach the wall? In some parts, 2 cm.

 

[tuokaya]

Did the job with foam sealant