I've never seen rockwool act like paper mache when wetted....... The only way to be sure is to have it tested at a lab. Where was it sourced from? It wound up in so many products its difficult to be sure by a photo alone. I know what the zonolite that came out of the Libby Mine in Montana looks like, that I still see on occasion in client buildings (I even had some and the empty bags to prove the source in my own attic before I took the old house down)
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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