ᐅ Toxic Insulation Material?, Single-Family Home from 1960, Roof Insulation Materials

Hello,
we are currently renovating a single-family house built in 1960.
Today, we discovered the following insulation material in the roof:

What are these boards called, and could they contain hazardous substances?
For example, asbestos?

I don’t know.
Can you imagine what processed hazardous materials might look like if you found them in an old house?
I assume you are concerned about the fibrous structure?
However, asbestos fibers are not visible in intact material and are microscopic (which is why they are so dangerous)... I just realized that the windowsill at my workplace contains asbestos...

Only a laboratory test can provide you with 100% certainty.

Thank you for the link.
Yes, the fibrous structure worries me. This is the first time I have seen something like this.
The white material in between looks like polystyrene foam.

The question is basically whether we should leave it as is or if it would be advisable to remove the boards.
The roof will be insulated from the outside anyway to meet KfW 85 standards.

There were also two radiators inside the house before, which contained asbestos.

So, I also researched asbestos a bit.
As far as I know, asbestos fibers are 100 times thinner than a human hair… so just because something looks fibrous doesn’t mean it contains asbestos. Think about our OSB or fiberboard panels—they don’t contain asbestos either.

I imagine old boards with asbestos inside might crumble or turn dusty when broken. However, I would be very reluctant to break an asbestos board myself, so I can’t really recommend doing that.

Take such a board to an experienced tradesperson who has worked in those earlier years. If there are any concerns, plan appropriate safety measures for renovation and ensure proper disposal.

Forum Asbestos Switzerland – an information page that also includes photos of the materials in PDF format.