What is this building material?

[Erik Waenerlund]

The black, curly one? From the right: concrete?, black hairy insulation material, plastic film, brick facade.

Located above ground in a villa from 1966.

/Erik

 

[Leif i Skåne]

Stone wool ? Type Rockwool. Made from Basalt = black lava.

 

[Knuten26]

The black, curly? From the right: concrete?, black hairy insulation material, plastic film, brick facade.

Located above ground in a villa from 1966.

/Erik

looks like tjärdrev

 

[Fotografen]

Could it also be dirty glass wool, like Gullfiber, perhaps?

 

[Knuten26]

looks like tjärdrev

Gullfiber turns black when it has been exposed to water and dirty air. Stone wool, e.g., rockwool, is made with diabase as the base. And is gray-green in color.