Solid wood parquet on underfloor heating

Ok, multi-layer parquet naturally doesn't look good anymore after severe damage. However, I would argue that floating installation is even better then (at least against falling objects), as the "board" can give way even more. When glued, it offers a nicely stiff resistance, and if the falling object is harder than the wear layer, then the board is the one damaged.

You also don't run 2.5mm

Exactly...I think that's called engineered hardwood, and indeed I was always focused on gluing it down. What surprised me now is that the floor installer said it should be installed as a floating floor because of the subfloor. As you say...I'm confused. But I won't look for anyone else now, as I fundamentally have a good feeling about the company. After two inquiries, I still haven't received an offer from another one. And I've already cut off the third anyway. So there aren't many options left, and time is running out.

Now I have a question about the offer itself...50% of the amount is due upon acceptance of the offer, 30% at the start of construction, and the remaining 20% at the end. Isn't that too much or is that common in the flooring industry? I once heard 30, 30, 20%. But if I already pay 80% before a single stroke of work is done, what can I still do if, for example, he does not perform his work well, etc.?

The heating load of the room always remains the same. The storage capacity of the screed with covering is only slightly lower. The system only becomes slower to heat up because the lower bulk density transfers the heat to the air more slowly. In contrast, it reacts faster when cooling down, due to the lower storage capacity.

However, a floor heating system is always slow, i.e., we are talking about somewhat slower here.

Everything else is individual feel or soundproofing or protection against the movement of wood.

I probably forgot to write that... I don't have underfloor heating.

Then the effect is even positive, because the surface does not feel as cold. And if it is also a building connection component, the U-value is further improved, meaning there would even be a slight energy saving.

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sorry, due to the heat pump hype I often automatically assume surface heating systems, as I rarely calculate with radiators anymore.