Hello
I am going to insulate the basement internally.
*I have Isodrän and proper drainage outside.
*50 cm of the basement is above ground and there is a sloping side.
*The basement is heated with radiators but cold.
*I think the slab is uninsulated.

Now to the question, I have had a long discussion with ChatGPT. It recommends that I should place EPS boards (styrofoam) tightly against the concrete. Absolutely no air in between, tight against the walls and floor (for the floor, GPT suggests that I should lay a regular EPS board and then EPS grooved panels for waterborne floor heating).

Is AI right or wrong?
 
I agree with AI. You don't want humid indoor air to reach the cold wall.
 
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Anders Fridholm
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