^^High humidity in the air I bet^^ I bet what will fix it is insulating the building and making the building tighter
Concrete is really not all that porous. Hell they make BOATS out of the stuff. Here we have the annoying-expensive-overblown-world-class "floating green" and yeah, it floats, and it's concrete...........basically the damn thing is a gigantic concrete barge
Down inside the thing at 3:10
And no, I don't golf and I would not go there if I did!!