Every Mikva I am personally familiar with is on the ground floor (first floor) or basement of its building.
Let's say a congregation owns a one story building they use as their shul. They agree to build a Mikva and this is the land they own. Is it feasible for them to build a Mikva by adding a floor to their building?
Are there any major Halachik or engineering issues with building a Mikva on the second floor?
"General knowledge (science, etc.) as it relates directly to Judaism" - is on topic as per this meta post.