ᐅ Waterproofing membrane or bitumen sheet?

We installed the Katja flooring ourselves in the basement; it’s not particularly difficult, you just need plenty of utility knife blades. Reason: the basement contractor recommended that we do it ourselves. It wasn’t a lot of work, and the costs were reasonable.

Was the foil not damaged by the workers (electrician/heating installer, etc.)? It is so thin...

You want to install a membrane for thermal insulation? That must be some impressive membrane...
Or am I missing something (condensation, etc.)?

Anyway. If someone told you that you will get 16cm (6.3 inches) of screed on top of the membrane / waterproofing layer, they most likely mean insulation plus screed.

I have seen that there is a foil with an aluminum layer. I assume this is also intended for thermal insulation. Please be kind to me;
•1: I am a woman
•2: I have never built a house before

It’s not really thin and can withstand quite a bit.

That wasn’t the question; it’s just about whether torch-on vapor barrier or Katja foil is better. Today we installed the torch-on version. Thanks to you all!