Perimeter insulation under the floor slab and still XPS under the screed?

Firstly, Steven is right. We are talking about rather small savings. But without insulation under the foundation, it won't get damp either, because a bitumen waterproof membrane will be applied on the concrete as a barrier. On top of that, the screed insulation, and finally the screed.

Hello everyone,

I am also currently building a KFW40 house, does anyone happen to have photos of laying an 8 cm insulation above the floor slab in the basement? I forgot to take photos for the energy consultant. It would be great if someone could help me out. Thanks

I only have photos of our insulation before pouring the slab.

Thank you, but I would need photos of the insulation above the floor slab if the interior is already plastered.

We are unfortunately not there yet, we have to be patient for a few more weeks