Cracks in basement ceiling concrete

[Henrik_1]

Hello,

These cracks in the concrete basement ceiling have appeared within a couple of months this autumn. The house was built in 1936. Is it something we should worry about or address in some way?

 

[Centano]

If they have appeared so quickly so long after the house was built, something is not right. Have you made any alterations to the house's structure, excavation work on the outside?

 

[Henrik_1]

There may have been a small initial crack formation near the pillar from before, but the crack seems to have spread a few meters over about 3 months perhaps.
We haven't done any drainage or other external work.
However, there is a bathroom above the cracks but it doesn't feel like it's due to moisture?

 

[mexitegel]

No, concrete does not crack due to moisture. Well, it can burst due to frost, but that's not the case here.

Conduct a thorough inspection of the entire foundation and basement ceiling etc. for additional cracks.

 

[Dilato]

In my "new" house, it was the plaster that cracked, then a chunk fell off. The concrete was intact. The plaster was probably 30+ years old.

 

[Henrik_1]

Okay, could it be that the crack is only in the plaster and not in the actual concrete ceiling?
It does look like there is a layer of plaster on the concrete ceiling, right?
It's a rental apartment, so I've only seen the crack in pictures so far.

 

[peroande]

I think it looks like raw concrete. You can see holes from air bubbles during the casting.