Plaster on cold asphalt indoors

[JonteP83]

We have a basement in an extension where one of the shorter walls is the former exterior wall of the original building.

The plaster on this wall had completely come loose and fell off in large chunks with light tapping. Behind it is that kind of tar paper that was used for foundation insulation. Above ground level, the plaster sticks well, clearly not wanting to adhere to the asphalt.

I started grinding away the asphalt with a diamond grinding disc, but it was quite slow, and after 5 minutes I found that the entire basement was covered with a layer of soot. Oops!

So the question is, is there any other way to get the plaster to adhere to the substrate, or a less dusty way to remove the asphalt?

 

[basseman]

Basement exterior walls are sandblasted to remove the asphalt, likely works on basement interior walls too. Bring in a company that's skilled at it.

 

[JonteP83]

We have a basement in the extension where one of the short walls is the former exterior wall of the original building.

The plaster on this wall had completely detached and fell off in large chunks with a light tap. Behind it is that type of cold bitumen that was used for foundation insulation. Above ground level, the plaster adheres well, so it's clear it doesn't want to stick to the bitumen.

I started grinding away the bitumen with a diamond grinding disc, but it went quite slowly, and after 5 minutes, I could see that the entire basement was covered in a layer of soot. Oops!

So the question is, is there another way to get the plaster to adhere to the surface, or a less dusty way to remove the bitumen?

Now considering Webers gypsum. The accompanying primer is supposed to be suitable for bitumen. What do you think about using it on the basement wall? It's a heated basement and now an interior wall.