Material in basement wall in 60s house?

[vikedm]

Hello,

I am in the process of tearing down paneling from a basement wall in a 1960s house. Underneath, I believe it's plaster, but it sounds hollow in some areas when I tap on it. So I got curious and started making holes in the plaster. Then I saw, as shown in the attached image. It seems that behind the plaster there is something that looks like wood chips but with a dark color, about 2 mm wide. It also appears to be a steel mesh of some sort before it becomes a cavity and then I believe it's concrete block. What I'm wondering is, what is all this? Is it something dangerous? Should I tear everything down since I'm already at it, or can I leave it as it is?

 

[vikedm]

After googling a bit more: Could it be träullit that has then been plastered?

 

[anhack]

This is how some of my basement walls looked, and as far as I know, they are cement-bonded wood wool panels that have been plastered. They sound very hollow when I tap on the plaster. I left mine in place, they are probably one of the less inappropriate choices made in the 60s and 70s when it comes to basement walls. There was an inflation in studded wooden walls at that time. These panels are somewhat in between.

 

[hscn]

It is Träullit. There is no reason to remove "from a risk perspective". Träullit works well as a plaster carrier, but is less effective for fastening screws and hooks.

 

[anhack]

It's Träullit. There's no reason to remove "from a risk standpoint." Träullit works well as a plaster carrier, but not as good for attaching screws and hooks.

Exactly, they are not so convenient if you need to put up things with some weight. Then it's best to attach to the underlying frame. It was clear that the previous owner of my house never quite made friends with these panels. In the walls, there were most types of fasteners you can find, even drywall expanders that expanded in the Träullit board...