Hello!
Taking a chance by asking a bit about
I have a house from the 1930s with a paper-covered terrace that has living space underneath. Water has leaked in, and I removed the ceiling that someone installed 20-30 years ago. Underneath, there were cracks leading to the reinforcement that was rusty and a longer deeper crack running across the entire ceiling.

The question is: what do you do about this?

You can address the waterproofing layer first if you believe you want to keep the concrete structure. But what do you do with the ceiling on the inside?

Might it crack again if you plaster over it even if it becomes dry now?

Tearing out the entire concrete slab and recasting it is possible, of course, but isn't that costly?

Putting up a new ceiling to cover it up works too, right?
Material for the ceiling in that case?
Other ideas?
 
  • Wooden terrace with table and chairs, part of a 1930s house renovation project, possibly discussing repair options for cracks and water leakage.
  • Cracked concrete ceiling with exposed rusty rebar, part of a 1930s house terrace renovation project showing water damage concerns.
  • Wooden beams on a damaged, cracked ceiling with visible concrete and rust, inside a house under renovation from a 1930s terrace.
  • Concrete ceiling with exposed wooden beams and cracks, showing water damage and peeling, in a 1930s house renovation project discussion.
  • Cracked ceiling with exposed rusty rebar, showing significant damage likely caused by water leakage, in an old building’s terrace area.
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That can be serious if the rebar is rusted in several places.

I would bring someone who can determine if it can be remedied without risk.

One option is to tear it down and replace it with a wooden structure.
 
You need to get a constructor there to assess it, it's too complicated a problem to give an opinion here.
 
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