How to insulate a basement internally?

[BWall]

I have a house with a basement that is furnished. The insulation was originally done externally, but the panels came off and are now gone. After a previous flood, the basement room was professionally renovated with a raised floor and walls with ventilation. The baseboards at the top and bottom have small holes where air is drawn in to be transported out via a fan connected to the floor. How should insulation be installed internally without disrupting the ventilation?

 

[Jarlingar]

The simple answer is that insulation should be on the outside wall of a basement.

 

[Anaii]

The problem is not the ventilation but the moisture. The wall needs to be open inward so that moisture that gets into the wall can dry out. Otherwise, you have a growing moisture problem.

 

[BWall]

The problem is not the ventilation but moisture. The wall needs to be open inward so that moisture that gets into the wall can dry. Otherwise, you will have a growing moisture problem.

But we have a gap between the cement floor and walls with plastic spacers. Nowhere does wood touch concrete. The air gap is ventilated with the help of a fan that draws air from the basement into the air gap and blows it out through a vent.