Hello byggahus!

I've been hanging around here for a few months now, reading thread after thread, and it seems there are many here with great knowledge, so I think it's time for me to throw out a question :)

A few months ago, we bought a house built in 1962.
It is a 1 1/2 story villa with a basement where there used to be a garage that was converted into extra living space in 1975 (they walled up the garage door with concrete block, filled in the driveway with cement, and built a new garage at ground level next to the house).
In the old garage, now the new room, they have added framework to the walls and installed chipboard, raised the floor, built in closets, etc.
I am now in the process of gutting the entire room to renovate with plastered walls, floors with an air gap, etc., and I am a bit unsure whether to take down the ceiling or let it stay.

In the building permit from 1962, it states that the ceilings in the garage, pantry, laundry room, and boiler room are asbestos cement boards, but I'm unsure if that is still the case. My theory is either asbestos cement boards were never installed or that when they converted from a garage to living space, they switched from asbestos to drywall or something similar.
In a corner where there used to be closets, a hole has been cut by the drain pipe coming from the bathroom above, and when I look at the ceiling in cross-section, it doesn’t look like the asbestos cement boards I’ve seen when I googled.
It is very porous, and I can easily break off pieces that crumble between the fingers—it feels just like drywall.

What do you others think, is this some strange variant of asbestos cement board or just regular drywall?
 
  • Close-up of a cut-away section of a ceiling showing insulation material and a pipe. The area appears damaged, with visible fibers and debris.
  • Close-up view of a saw-cut ceiling cross-section showing fibrous insulation and porous material, possibly gypsum, with crumbled edges.
  • A hand holds a small, porous fragment resembling gypsum board, questioned for being asbestos in a home renovation project. Blurred background features a modern kitchen.
  • Close-up of a hand holding a small, porous piece of material, resembling plaster or gypsum, in an indoor setting with furniture in the background.
P
Looks like plaster..
 
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SågspånPappspikEternit and 1 other
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Rejäl said:
Looks like gypsum..
Yes, it does, doesn't it?
Even in the boiler room, it seems to be the same type of ceiling if I check where the pipe to the old expansion tank in the attic was.
From the pictures I've seen, asbestos cement boards look gray and heavy/hard. This is light and porous.
 
  • A damaged ceiling showing a hole with exposed material, revealing the site of an old expansion tank pipe. The material appears light and porous.
  • A hole in a ceiling with exposed damaged material around a pipe, possibly for an old expansion tank; ceiling material appears light and porous.
P
Yes, you are absolutely right in your analyses, gips är det😊
 
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