Sealing the base slab before the roof is installed

The question is, will it dry if the weather is getting more humid now?

No, he does not want to put the partition walls on the raw floor slab. I really understood it this way, finish the exterior walls, complete the sealing on the floor slab, and then build the partition walls on top of that. And I have doubts whether that is okay. Is there something special under the walls and the other one a normal welded membrane?

If the roof is on and there is a draft, it dries out. No waterproofing membrane may be installed under the masonry.

So it is technically not correct to apply the sealing directly to the masonry?

Yes, but not on bitumen membrane. How else should it be sealed tightly?

I am talking about the completely sealed base plate, and building up. It is clear that a seal must be placed underneath during installation. But that seems to be different materials.

Could it also be that he wants to use a sanded bitumen membrane for the entire base slab? Would that be technologically okay then?