When a window is too low there can be problems.  Raising the windows here was not an option. These windows were historical period windows, which would have incurred too much cost to move for the value of the windows. These windows will get an apron flashing mechanism, and a rubber overlay over the wall. Cover tape wrapping all penetrations from railing ballasts will keep this from leaking for a nice long time.  Love providing great value for our customers! Call Litespeed Construction with your next commercial roofing repair, we can do it!