How to make a reliable window seal?
Since our window installer did a poor job on the interior sealing, after much hassle we decided to do the sealing ourselves. The interior sealant tape was leaking in some places between the window frame and the wall on the frame. Do we need to remove the window to get the sealing tape tight again, or is it enough to scribe the seam between the window frame and the sealing tape with foil adhesive?
There may still be an option to put tape on the front of the window if it is still covered with plaster.
What would you recommend?
Kompriband, which is applied around the window before installation and expands after installation and can take on several functions (sealing, insulation), cannot be applied afterwards without removal. Fortunately, there are several ways to accomplish this goal. Sealing tape applied to the window frame can also help separate the indoor/outdoor climate from the outside. That's what it exists for. And yes, it should certainly be done in the opening area in such a way that it is hidden by the plaster.
However, the execution may vary somewhat depending on the type of construction. I only know the one required for frame or all-wood construction.