Corroded corner profiles in interior plaster

Hello everyone,

we have a topic again with our new building...

Numerous corner profiles embedded in the plaster are corroded, even though these galvanized profiles actually shouldn’t rust. The expert demands a complete replacement. Of course, this involves greater effort and costs, so the construction company resists and says that sanding down and applying zinc spray is sufficient. We are naturally afraid and suspect that it will continue to rot underneath and sooner or later (probably later) break through the paint or fleece/wallpaper.

Has anyone ever had experience with this and what are your assessments?

P.S. we had a similar issue before with the profile carriers in drywall - there they actually sanded down and treated with zinc spray.

So first of all: I have never seen that before and my first thought was that they installed the wrong profiles. We have already used various manufacturers and never had rust problems. Of course, the effort is considerable for the client. But I also don’t think I would trust that the zinc spray will prevent rust for the next 70 years - interior plaster really lasts forever. I would also insist on a replacement. I would also fear that the rust will sooner or later come through again.

First of all: I've never seen that before...

Hello Winniefred, thank you very much for your assessment. With it, I was able to further support my demand at today’s acceptance inspection required by the BL (of course, fully anonymized). It was scheduled too early by him anyway, and I still find it a huge cheek to want to carry it out at all costs when numerous craftsmen were still present, trades not yet completed, and extensive reported defects had not been fixed. I suspect the construction company wanted to have the document afterwards to be able to deny everything in their favor...