ᐅ Recommendations for Impact Sound Insulation Between Floors?

Hello,
I am planning a new build and want to achieve very good impact sound insulation between the ground floor and the upper floor, as separate apartments are planned. I have seen the following recommendations:

• Decouple the screed from the side walls using edge insulation strips
• Use impact sound insulation under the underfloor heating, for example, a 30mm (1.2 inch) soft fiberboard
• Below that, install thermal insulation with space for installations (50mm (2 inches))

Do you have any tips on how to improve this? The plan is usually to have a wooden plank floor on top (bathroom tiled) and a concrete slab below.

When it comes to soil-related topics, I generally find it wise to involve @KlaRa in the discussion, just in case.

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I am wondering whether it is really the responsibility of the client (layperson) to calculate or determine the floor construction?

If there are special requirements, for example particularly good sound insulation – of course. The general contractor usually just installs average EPS insulation and that's it.

I reversed the thicknesses in my case. So, 30mm (1.2 inches) thermal insulation and 50mm (2 inches) sound insulation. Actually, it’s supposed to go from soft to hard, but I didn’t do that either. Sound barely gets through to me, but I haven't moved in yet.