Floor construction cellar floor, cellar ceiling, ground floor ceiling

Hello dear forum members,
we are in the middle of planning while waiting for the approval, and now it’s about the planned floor structure. We are building with a basement and the basement floor is specified according to the thermal protection certificate and should remain as is. But with the intermediate ceilings to the ground floor and attic floor we are not 100% sure. Underfloor heating is to be installed everywhere. We are not planning a ventilation system or central vacuum, i.e. on the concrete floor there will then “only” be the classic water and electrical lines.

1. Basement slab: Concrete_2400 250mm, PS-035 impact sound insulation 140mm, PE film 0.20mm, cement screed 50mm, tiles 15mm.
Here are my first questions: We actually planned to install flowing screed. Does the thermal protection certificate have to be adjusted for that or does it not matter which screed is used? Will the flowing screed also be laid 50mm thick?

2. Basement ceiling/ground floor slab, the architect plans here: concrete ceiling 200mm, floor structure 180mm.
Here are my questions: What does an optimal floor structure look like when we are also planning tiles almost everywhere on the ground floor? Laminate is to be installed in the guest room. We are unsure about the 180mm. Isn’t that too much? Wouldn’t 150mm buildup be enough? For example: concrete ceiling 200cm, impact sound and thermal insulation 85mm, flowing screed with underfloor heating 50mm, 15mm tiles or laminate.

3. Ground floor ceiling/attic floor slab, the architect plans here: concrete ceiling 180mm, floor structure 160mm.
Here is our proposal for the exact floor structure: concrete ceiling 180cm, impact sound and thermal insulation 65mm, flowing screed with underfloor heating 50mm, 15mm laminate.

And a completely different question: What do you think of cork with underfloor heating?

I would be very happy about opinions and suggestions!
Best regards, Kisska

In the upstairs floor, drainage of the shower could be tight if it is to be installed flush with the floor.

A different question: Why don’t you simply have such demanding details planned by a professional and, if necessary, explain the reasons for it? No one here can say what is “optimal” for you – especially under which aspects. From a financial perspective, for example, a as simple a setup as possible is “optimal” – but probably not from an energetic one.

Regards

K1300S

@Brata: Thanks for the hint. You probably mean that the insulation is too little to properly close the sewage pipes? Ok, then one could certainly use 70-75mm insulation here as well. We just don’t want to insulate too little between the fully heated floors. That’s not the point, after all...

: We definitely also get advice from professionals, but it doesn’t hurt to get some preliminary information in such a forum. Because professionals often sell what currently brings them the highest margin and not necessarily what is 100% needed.

That is why I recommend a proactive inquiry – after all, the expert must stand behind what they install, and in my experience, with suitable questions it quickly becomes clear whether the planning is sound or needs to be revised. If you now simply dictate to him what you want, that might also not be ideal. In any case, as a layperson, I consider it highly problematic to want to intervene in building physics in this manner. There is a comprehensive concept that cannot have arbitrary details changed without affecting the outcome.

VG

K1300S

Who is the expert for you in this case? The screed layer? The plumbing specialist? The architect? Or perhaps an energy consultant???