Of course, moisture occurs. Where else should the water vapor go. Then the vapor barrier is applied to the concrete ceiling, e.g. with mineral wool. The boards are not secured with it either.
If at all, the vapor barrier goes on the concrete ceiling, e.g. with mineral wool.
Nothing has to go on the concrete ceiling. No barrier, no seal or anything else. What moisture is supposed to be stopped? With wooden beam ceilings I agree with you, but not with concrete.
Nothing needs to be applied to the concrete ceiling at all. No brake, no barrier, or anything else. What moisture should be slowed down? I agree with you about wooden beam ceilings, but not with concrete.
and even if he puts it on, the world won’t end. Sweep everything clean, edge insulation strips, lay overlapping foil and seal the joints, then put Styrofoam on top. Lay one strip horizontally and one vertically, OSB on top, glue tongue and groove, and off you go. I can already feel the cozy atmosphere at home.