I am finishing a bathroom rough-in in my basement and have a couple of questions. Sink cabinet (wood) - is is safe to just place it on the bare concrete, or will it absorb moisture from the floor? Should I put something under it? I am going to tile the floor, so should I put it on the tile? Toilet flange - my parents tiled their existing bathroom and had to use two wax rings on the toilet flange after tiling. Should I tile up to the drain and install the flange, or install the flange and tile up to it?