A good Friend and learned member of our Industry has just asked a question.
To which I felt some of our older guys may be able to help?

Early Cold Store Insulation was a form of Cork Layers clad in a Asbestos Board.
Which Had a Grey and Black stippled Finish.
What was that Board / Finish called?

It used to be a really common Finish.
Thanks Guys!
Grizzly.