How to properly insulate basement walls?

Hello everyone,

As an amateur, I still want to insulate my basement myself. I am building with a prefabricated basement from Schwörerhaus (basic basement): The exterior basement walls consist of two concrete shells with smooth surfaces, connected by reinforcing steel.

Now to my question:
I want to insulate this basement. One room will be heated later. What do I need for this?
Which materials? I have seen that often blue or pink "boards/mats" are used.. what is important to consider here?
Do I still need bitumen? Adhesive? Waterproofing?
What does the wall structure look like? :confused:

Can someone help me with this?

I thank you in advance..
hulix

INSULATE???? WHY????

install a healthy and cheap heating system, and forget about insulation.
Radiant heating would be the healthiest for humans. So install heating strips yourself, and save 30% energy without insulation.

Best regards :confused:

I am building with a prefabricated basement from Schwörerhaus (basic basement): The basement exterior walls consist of two concrete shells with smooth surfaces, connected by reinforcing steel.

Sorry hulix for my counter-question, but Schwörerhaus offers insulated basements, why don’t you just order an insulated basement?