XPS panels basement insulation - no bitumen layer

The soil survey is now also here, so I can discuss the topic again with the shell builder and architect.

I find it quite strange that XPS is dowelled in the perimeter area. Especially since the waterproofness of a waterproof concrete basement depends on the material thickness and this is weakened at the drilling points.

But when even the expert speaks against breathable walls against earth, things will probably get pretty funny there.

In the meantime, I have much worse problems....see my other thread....

That doesn't sound good. Where is the other thread or are you still writing it? :)

I find it quite strange that XPS is dowelled in the perimeter area. Especially since the watertightness of a WU concrete basement depends on the material thickness and this is weakened at the drilling points.

But if even the expert speaks against breathable walls against soil, it’s probably going to get pretty funny there.

It was done this way throughout our entire construction area, regardless of the shell construction company, also for the basements as white tanks. All basement insulation boards were doweled. Therefore, I cannot imagine that this method contradicts any standard.