I can see this white fiberglass looking material between the top of the aluminum hood inside the fireplace and surrounding metal. Is it dangerous? I am thinking asbestos, or is this fairly normal to put fiberglass in the fireplace like this?

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  • How old is the fireplace?
    – Ecnerwal
    Mar 14, 2021 at 17:58
  • It was built in 1981
    – Michael
    Mar 14, 2021 at 19:46

1 Answer 1


There are many non-asbestos high-temperature fiber insulations (Kaowool, Superwool, rockwool, etc.) - but as with all asbestos questions, you can't tell by looking, so send a sample to a lab if it's of an age where asbestos is possible.

Fiberglass won't take the heat, so it's not that.

  • I guess the other question is, even if it is, is it dangerous? We never operate the fireplace.
    – Michael
    Mar 14, 2021 at 20:11
  • 1
    If you don't disturb it, it's not a problem. Probably not a problem even if you used the fireplace - only if you were doing something to release fibers into the air of the house would it be a concern. But 1981 is also getting late for application of asbestos.
    – Ecnerwal
    Mar 14, 2021 at 20:50

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