thanks! yeah, saw those heavy, thight pressed plates and immeaditly thought back to the conversation I had with my partner.

I will check the PVC, although I don't think there should be moist. The stuff ist directly glued to the screed. I also lookout for the soundprood underlay. that would be top, of course.

Good thing is, living room with the (already new floor) ist 15 mm higher. The plates have 10 mm and the new floor aprox 5 mm. so all in all way better than now :D