Stone pillar in conservatory damp

Yes, everything consistently, he just said it is not possible otherwise and was gone again. He said the stone pillar cost a lot of money. The problem is we had 3 companies and each would have done it the same way.

Yes, throughout,

Then insulating the stone pillar alone probably won't help either, since you will have the same problem at the window sills.

Problem is we had 3 companies and each would have done it the same way.

Nobody wanted to miss out on the contract. The correct way would have been to install the windows first in order to insulate everything afterwards.

Do I understand correctly that the part is basically just standing on the windowsill?
Statically, it probably doesn't have any significance.
Therefore, I would simply throw that thing outwards and install something else there.
The window connections with the foam are not done properly anyway, nothing will have been screwed there, the little column probably wouldn't have survived that.
Overall, it's really a nonsensical construction, also with the continuous windowsills.

I've thought about that too. But that just shifts the problem to the windowsills.

Well, the boards aren't quite so dramatic, of course also silly. Depending on the substructure, one could have taken the opportunity of installing the windows to cut them all lengthwise and equip them with some spacing/insulation under the windows.