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19 replies
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19 replies
Is this insulation asbestos?
Hobby electrician
· E
· 15 367 posts
I claim that it is stone wool and cardboard.
Looks more like glass wool and cardboard from around the '70s
Best answer
It is certainly not asbestos, it wasn't used as insulation in floor structures, but it is probably mineral wool that has been discolored perhaps by leaky cracks. When it pulls through them, they become dark and sometimes black.


