Only brick up the windows from the inside

Hello everyone, I have 2 plastic windows in my bathroom, one of which I would like to brick up for the installation of a shower. The bathroom is located on the first floor of our private house. However, I want to keep the window itself on the exterior facade. (East side facing the neighbor) My idea: seal the window with silicone, apply a mirror film to the glass, stick a piece of roofing membrane to the frame, then fill the rest with insulation wool. Put a second membrane over it and then cover it with moisture-resistant gypsum board. My question is whether all of this really protects against moisture and is sufficient, or if the window might possibly even get damaged?

Hi,

You want to keep the window installed and then seal it from the inside, right?
First of all, the question arises for me, WHY?
Secondly, it is structurally and building-physics-wise nonsense and wrong. The area will completely rot away sooner or later (I suspect sooner).

So my tip is to completely close the window and follow the construction of the rest of the wall... then nothing can happen.

Regards

Thank you very much Curb for your honest answer, the idea behind it was actually to save work since the window is indeed on the 1st floor but can only be accessed from the garden side behind the house, (height approx. 5m). Furthermore, I believe that later the subsequently applied plaster and paint will be visible. I guess I will have to bite the bullet... :-( . Regards back

Take comfort in the fact that it will look better afterwards.

Hello, I can only suggest that you completely remove the window, because otherwise mold will really start to form, or over time moisture could penetrate through driving rain and damage the wall. Set up a scaffold outside, or have one set up, and then plaster and paint. Of course, it is visible. Regards