Allright, at last the ground is dry now!
This afternoon I cut the palets in order to fit the odd room shape perfectly (not a single 90° angle in there).
Question for you gameroom building pros:
Do you think I should:
_put the anti humidity layer on the concrete ground, then the palets, then the OSB/plywood panels
OR (in order to let the concrete "breathe" more)
_put the palets straight on the concrete ground, then the anti humidity layer, then the OSB/plywood panels
last layer will be the cabs of course