House wall inside flaked off??

Hello everyone,

I recently noticed the following damage (see pictures) on our living room wall.

It looks like the affected piece simply popped out. It cannot be pulled out or moved and is in one piece. In some areas (however not at the level of the tiled baseboard, nor 15 cm above it) the wall sounds hollow when tapped but is still firm (the visible bulge to the left and slightly below the large crack in the second picture). I am pretty sure the damage was not caused by force, i.e. hammer blows, etc. There is no damage to be found on the exterior wall at the corresponding spot.

The exterior wall in question (which leads to the terrace) was built (like the entire house) in 2004 and is located in Vordertaunus.
The basement material is reinforced concrete as a white tank. The ground floor and upper floor are made of Ytong aerated concrete glued together.

My questions are:

[*]Does anyone know this phenomenon and if so, what is it and how do you fix it?
[*]Which building professional should I contact to possibly learn more about the damage (shell builder, plasterer, building surveyor...)?
[*]Do I need to worry about the structural integrity? (I don’t think so, but I’m really not an expert)

I would be very grateful for your answers and advice.

If further information is needed, please ask me. I will gladly provide all the information I have.

Best regards

Mike

Possibly chipped aerated concrete that does not withstand the pressure of the building's superimposed load as a narrow pillar. Which "stone" with which compressive strength or which lambda value has been bonded? You can also remove the wallpaper and see what appears underneath. Aerated concrete is a borderline building material that is extremely sensitive to compressive and shear stress.

Hello wpic,

thank you very much for the quick response. Unfortunately, it has not contributed to me feeling safe in the house.

Unfortunately, I cannot say which stone was used. However, I found an "archive photo" that at least shows the packaging of the stones and also exactly the column in its shell construction state.

Is this photo helpful?

Kind regards

Mike