ᐅ Is fiberglass wallpaper/fiberglass fabric harmful?

I am considering using glass fleece in the living room and bedrooms of our new house. I am thinking about products like StoTap Pro 100 P painter’s fleece or StoTap Pro 100 S painter’s fleece.
I would like to get the experts’ opinions here.
1. Is it breathable, for example compared to a cellulose painter’s fleece? Or will it completely seal the wall and cause mold growth?
2. When cutting the glass fleece, I noticed small glass particles in the air. Is this potentially harmful to health over time once the fleece is glued in place? Maybe I am being paranoid, thinking of the notorious history of asbestos, which was once a popular building material, and whose fibers caused tuberculosis in the latter half of the last century.
Are fiber particles released from the glass fleece after it is painted, and could they cause any health issues?
The specification on the STO website states:
“not respirable, as fiber diameter > 5 µm”
What does this mean? Are glass fiber particles emitted continuously but are not harmful because the particle diameter is larger than 5 µm?

3. If I have to choose cellulose painter’s fleece, which one would you recommend, for example which brand/

Thank you!

asterixyz schrieb:

1. Is it breathable, for example compared to a cellulose painter’s fleece? Or will it completely seal the wall and lead to mold growth?

Walls and wallpapers do not breathe. They never have. However, if you had read the manufacturer’s description, you would have found the answer right away:

• Mold-free: The non-woven wallpaper is breathable and especially suitable for humid areas like kitchens or bathrooms because it allows air circulation and can help prevent mold growth.

P.S. Mold is caused by high humidity, poor ventilation, and inadequate heating. The wall covering itself is almost irrelevant to mold formation.

asterixyz schrieb:

What does it mean that glass fiber particles are continuously emitted, but it is not harmful because the particle diameter is > 5 µm?

Yes, and after two to three years the fleece breaks down and is entirely in the air you breathe ;-)
Of course, it is not continuously emitted. Plus, you will still be applying paint over it. The key point is that the fibers used are large enough.

asterixyz schrieb:

3. If I have to choose a cellulose painter’s fleece, which one would you recommend, for example, brand/type?

Basically, it doesn’t matter. The main difference is thickness. Renovation fleece is thicker/heavier and better at covering uneven walls.