Door diffusion tape damaged - professional repair?

At our place, the diffusion membrane on a door was damaged/removed...

I then reported the whole thing to the site manager accordingly and now it has probably been smeared over with silicone. Is this professional?

Thanks for the help

It is a bit hard to see in the photos but it is probably the "Kompriband" if I understood correctly. The main function of the tape is to ensure wind tightness, my window installer (and Google) said. The tape will later be plastered over with the exterior plaster. Whether the silicone at this point poses a permanent problem is hard for me to assess. But: Just ask your site manager exactly where in the RAL guidelines for the installation of windows and doors the repair with silicone can be found. Then he will first have to think and pause before speaking. Then you follow up saying: "Great, then we agree that the Kompriband will be professionally repaired, please let me know briefly when exactly this will be done so I can watch it myself."

It is a bit hard to see in the photos, but I believe it is the "Kompriband" if I understood correctly.

The picture is from the inside... In terms of material, I would say it is similar to the roofing underlay membrane.

If that is inside, and it is acrylic and not silicone, you can do it that way. It is important that the inside is vapor-tight (more than the outside) and airtight. There are compressible tapes for the inside (vapor-tight) and outside (diffusion-open) and wide combination tapes that go across the entire frame depth and combine both functions. Acrylic is also vapor- and airtight. If the inside is plastered over and it no longer looks so smeared, it is not the most beautiful solution, but it can be done. If you have only agreed on "einbau Fenster", you will have little leverage. If you have commissioned according to RAL quality standard, you could insist on compressible tape or vapor-retarding foil inside. Installation according to RAL is not a regulation/DIN/standard, but a quality standard that observes certain guidelines during installation and also allows various solutions here. With silicone, it is different. Silicone is not vapor-tight and cannot be plastered over or painted. Then indoor moisture could penetrate into the area and, depending on the external sealing, not escape anymore, and paint and plaster will not hold at that spot, or the plaster profile, which hopefully will be installed there, could detach.

I don't want to lean out too far, but that doesn't look like acrylic? Acrylic doesn't shine? And they probably wouldn't have been stupid enough to smear silicone there. I guess it's something like Illbruck SP025, a sealant adhesive that's usually used to glue the inner window sealing tape to the masonry.

Acrylic doesn't shine?

quite fresh indeed. But you're right, in terms of color, it could well be some kind of adhesive and sealing compound. These are usually also plasterable and possibly even listed in the RAL procedures.