We have had a couple of Cool weather and look what is happening, wait till it gets very cold in Winter.
This is a huge issue that does not seem to get much attention, lots and lots of apartments have been and are being built like this, These apartments are only 5 years old.
At a minimum, the condensation should be captured within the window system and dealt with.
Millions of lives are being put at risk long term.
Cost of materials and lack of understanding by the Estimators and Project managers to fill a hole, quite simple.
If you are having a similar issue, please talk to Energy Saving Windows for an efficient and cost effective solution.