How thick is the plaster wall?

[A-Man_08]

It is a wall against the neighbor.
At first, I thought it was double gypsum 26mm, but it looks thicker when I measure with a paperclip.

 

[JanneJanne123]

There is no wallpaper or broad spackling that builds up a little too? Then the margin of error in the gem measurement can also play a role.

 

[A-Man_08]

Just a round layer of paint.

 

[AXS]

There may be air between the drywall boards?

Or they are glued together.

 

[A-Man_08]

These are probably lying against each other, it looks like a large disc.

 

[Rabbithole]

Can you see if there are 2 gypsum boards or could there be chipboard behind the first gypsum?

 

[A-Man_08]

Nah, it's just plaster.

 

[ItWasntMe]

the question is rather, what do you want to use the measurement for?
it's impossible for us to know how you've measured and the reason for it.
Normally double plasterboard is 26mm. but with some gaps, debris, etc. it could be larger.

 

[A-Man_08]

I have measured with the paperclip above in a 7mm drilled hole.
I will attach 2 screws in the wall for a mirror.

 

[JanneJanne123]

What kind of screw are you planning to use that requires you to know the wall thickness to the millimeter?

 

[Matti_75]

Fire gyprock is 15mm thick. Would guess that it's one of those + a standard gyprock 13mm to meet fire and sound requirements.

 

[A-Man_08]

Expand.
But I might just ignore them and go with brun plugg.

 

[JanneJanne123]

Expander for double plasterboard will work, it's not that precise to the millimeter.

 

[Borgir]

If there is a fire cell between you and your neighbor, it should be double 15mm fire-rated gypsum with fireproof sealant between the layers, and in the joints, there should be metal... you cannot make holes just any way in that wall...

 

[A-Man_08]

Initially thought it was 30mm a bit difficult to measure exactly, probably going for it as it's the wall towards the neighbor.
It will be brunplugg.