I was recently on the roof of a metal building, a hangar built 20 to 30 years earlier. We were doing some work on the hangar door system. I'd noticed, from below, numerous obvious roof leak issues. A typical R-Panel type roof, I set out to replace an old screw or two adding value to our service. I walked off the roof, found the noted locations and observed other areas of concern. It became apparent to me that this was another case of a good product, poorly served by a sloppy installation.