ᐅ New Construction – Mold on the Roof Beams

Hello everyone,

Our heating system was put into operation three weeks ago. Unfortunately, the roofers installed these black things (I don’t know the name, see photo Roof 2) in between. Because of this, a lot of moisture has accumulated, and now the beams are starting to develop mold.

Our construction manager said we should wait until everything dries out first and then treat the roof beams. In the long term, we don’t expect any negative effects.

What do you think about this?

Thanks and best regards
LG

That looks like insulation to me, most likely wood fiber insulation. To ensure that NO moisture penetrates, a vapor barrier membrane MUST be installed underneath (and sealed tightly).

Since these plastic pieces were installed, the moisture has been gradually escaping, so this should no longer be a problem.

What are those black parts on the roof membrane? Are they supposed to be there? My cold roof doesn’t have any.

They are there to allow moisture to escape, and that was exactly what was forgotten. Since these have been installed, the moisture has been able to leave effectively. There may be other solutions, but I am definitely not the right person to ask about those 🙂

Do you know what they are called by now? I think I need those parts as well.