Adhesive vinyl directly on the screed?

Hello

I have bought a new semi-detached house
the entire 1st floor and attic (except the bathroom) are to be covered with vinyl
all rooms have underfloor heating

I have read that self-adhesive vinyl is better suited because the vinyl has direct contact with the floor and thus absorbs the heat better than tiles, and also the impact sound insulation is supposed to be much better and more durable

In all rooms the screed is laid floating

Question
Is the floating laid screed smooth enough in the end to simply stick the self-adhesive vinyl on?
or does the floor have to be sanded smooth first?

or more precisely apply (have applied) [Bodenausgleichsmasse] in the appropriate thickness? Keep in mind that the screed height should be adjusted to the chosen flooring beforehand. It is better to discuss these points with the screed installer "room by room" in advance.

I read that self-adhesive vinyl is supposed to be better because the vinyl has direct contact with the floor and therefore absorbs heat better than tiles, plus the impact sound insulation is supposed to be much better and more durable

You can't say that so generally.

Is the floating screed at the end smooth enough to simply stick the self-adhesive vinyl on? Or do you have to sand the floor smooth first?

Here it depends on the type of screed and also on the execution. But as superzapp already wrote, leveling compound and/or a primer coat (before gluing) wouldn't be a bad idea and just follow the manufacturer's instructions.

Apply loops and ground, straight adhesive vinyl otherwise shows all unevenness.

I just remembered that the search function should show a post by in which exactly this topic was discussed. I seem to recall that the theoretically existing "air pockets" under click vinyl (and the impact sound insulation underneath) only lead to slightly more inertia of the underfloor heating. So, regarding the original question of the OP, they are not relevant. But otherwise, in my opinion, they do matter. Click vinyl "clatters" on unevenness, so it is louder. Pure theory, but probably the click joints are also more stressed. Gluing down vinyl flooring yourself probably isn't an option due to lack of proper equipment. So have it done. And the professional will set the framework conditions anyway :p

Or simply lay click vinyl over the impact sound insulation on top of the raw subfloor if you are not a perfectionist - done.

Thank you for your messages

Self-adhesive vinyl is easier to install than applying the glue first and then laying the vinyl (like with tiles)

So flowing screed still has unevenness?