Gray insulation in closet wall

By | December 3, 2019


Hi,

The baseboard of my bedroom wall to closet wall broke and it exposed a grayish insulation. Can someone advise what exactly this is? I have it currently covered with tin foil just in case it is unsafe to breathe in.

[https://imgur.com/a/AyfoOqK](https://imgur.com/a/AyfoOqK)

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Thanks!


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