While removing/cleaning the bathroom fan hood, I noticed that the edges of the hole in the drywall ceiling have a very fibrous-looking layer/sheet on each side of the gypsum.

This house is very old (going on over 100 years) and I'm not sure when this bathroom's ceiling was last renovated.

I will take a sample to the lab tomorrow, but wondering if anyone has seen the sheeting look so fibrous like this?enter image description here

Hole around bathroom ceiling fan

  • 1
    Hello, and welcome to Stack Exchange. This looks like standard drywall to me. Commented Dec 3, 2016 at 1:00
  • I agree older Sheetrock had thicker paper than today's.
    – Ed Beal
    Commented Dec 3, 2016 at 17:13
  • It's standard fiberblass reinforcement. I wouldn't worry about it.
    – isherwood
    Commented Jan 5, 2017 at 22:28

2 Answers 2


If that drywall job is more than 30 years old, it could have asbestos in it, but you wouldn't be able to see it - the fibers are too small.

Those fibers are probably fiberglass - added for strength.

Testing either way, causes no harm.


You won't appreciate this answer, but it is for sure correct:

Nobody online, or in person, can tell you if there's asbestos in that drywall. The photograph does not have high enough resolution to see the fibers.

Indeed, the only way to be positive about your question is to send it to a lab for analysis, otherwise you are taking a gamble with both your health, and the legal system.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.