tough mass between masonry and concrete ceiling.

I think so.

I have little to no contact with this type of ceilings, so I can only provide rudimentary assistance at best; sorry As I gather from the installation video (Aunt Google), hollow ceilings are installed without soundproofing. With some luck, however, your provider thought of that and installed roofing felt as the top layer of the wall crown. This material "could" then have been installed somewhat sloppily in the HAR and then moved. However, that is too much subjunctive for *me*. Since you are, due to the facade work, in dialogue with your provider anyway, ask him if he installed soundproofing under the row of stones beneath the hollow ceiling. Only in this way can you get to the bottom of the cause—by the process of elimination. If he answers yes to your question, all the better; then you very likely have the means to calm your wife down Rheinische regards

However, that is too much subjunctive *for me*. You are, due to the facade work, already in dialogue with your provider. Ask him if he has installed soundproofing on the row of stones under the hollow ceiling. Only in this way can you get to the bottom of the cause - by the process of elimination. If he answers yes to your question, even better; then you quite certainly have the means to calm your wife

Thanks to you. I will clarify that with the site manager.

By the way, the finishing plaster will be applied next Monday/Tuesday, then hopefully the issue will be resolved.