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The3aGl3 t1_j214e6d wrote

From the texture it looks more like you have some kind of particle board instead of drywall.

Personally I'd unscrew a smaller piece, that'd allow to look for insulation, as well as closer inspection of the "drywall". I also don't think that you'll get a very nice finish on it if this is your first time, at least not for any reasonable effort. Filling the gaps is one thing but getting the whole area flat is a whole other ordeal. Not doing it would leave you with clear filler lines everywhere in contrast to the texture of the wall.

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from125out t1_j21663m wrote

Looks like it has an asbestos type colour to it.

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The3aGl3 t1_j216qad wrote

You're right but to me the particles don't look fine enough. OP should definitely make sure though.

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payzanto OP t1_j217irm wrote

I think you're both right that it's some kind of fiber/particle board. Managed to pull some of it back and that's what it looks like. I'll also test for asbestos I guess.

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604_heatzcore t1_j2197fd wrote

Don't guess.. do it especially if your going to do the work yourself. Asbestos is no joke If it was built after 85 it probably 99% isn't asbestos. That isn't drywall it's something else with fibers in it so mudding and sanding that isn't very ideal. Another option is to drywall over it. Which also helps with sound deadening and Insulating.

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