We had a deluge rain several nights ago. After this was going on for awhile, I noticed water dripping from a fluorescent light fixture directly below the mounting of the AC. I have been in numerous rain storms (perhaps not as bad), and never had a leak issue. Upon inspection, I noticed that the AC actually is not flat on the roof; but instead has Styrofoam material approximately 1/2" x 2" x 4" located in several different places (I presume the Styrofoam is for the purpose of dampening vibration). The rain apparently was blowing under the AC since, once again, it is not flat on the roof, and in fact sits about 1/2 inch above. It is impossible to see under the AC to check for use of sealant. I have no idea how it's mounted, and at this point I can only presume that the leak was a result of a blowing rain; unusual from other storms encountered. I would appreciate any technical advice about the installation, and possible causes for the leak.