ᐅ TV show about tips and tricks for building a house...

The bitumen layer is intended to prevent diffusion and, according to the manufacturer and standards, must be applied without exception. Some skip this step, which you need to consider if the risk is worth it for you. We intentionally commissioned and inspected this work.

Zaba12 schrieb:

Okay, I can understand that for an unfinished basement that will still be plastered. For a cast-in-place concrete basement where the soil presses against the perimeter insulation, your method is standard practice and, according to my quote, saves about 3,000 euros (around $3,300) before tax. Without glued insulation, no water comes through anyway 🙂

Now the question is whether you paid the 3,000 euros (about $3,300) and it was not executed, or if it was credited back to you because it wasn’t done.

That was the classic situation where I read the quote but didn’t fully understand it and relied on the construction management, assuming they had done it a hundred times before. The layer wasn’t included in the quote, and it was executed accordingly, so I didn’t pay for it… but since the basement is exposed on the north side, I would have liked to have it.
My point is that experts should maybe be involved earlier, already when collecting quotes for major trades.

Zaba12 schrieb:

No water will get through even without glued insulation.

Insulation should always be glued, including in the perimeter area.
If water gets behind it, the effectiveness is significantly reduced.

Since this discussion is currently about the NDR broadcast and also about slab insulation, I would like to recommend the NDR segment.

I have only studied the topic of slab insulation from an energy efficiency perspective, but the two negative examples shown in the film demonstrate that even after 4 years, a poorly insulated slab can cause moisture problems in the house.

Maybe someone can explain more about the causes of the mentioned "water damage" and how these can be prevented through proper planning.

A house like this should be built on a waterproof, continuous foundation slab. Additionally, the construction method depends on the load case; it may be worth considering drainage to divert water away. Preventing water ingress is related to waterproofing rather than whether the building is insulated or not.