Reddog1 wrote:
I would raise (pedestal) the area of the penetrations 1 to 2 inches. The pedestals would be molded in. The flanges of the penetrations would be about 2 inches wider than the item fitted to the penetrations. For example, the standard opening for vents and A/Cs is 14 inches. I would make a pedestal 18" by 1 or 2 inches high. With the raised pedestal, it is very unlikely you would have a leak at that point.
Wayne
That's clever. You could do something similar with solar panel mounts. Protrusions for the screws(or bolts) to go into that will never completely penetrate the skin(as long as you use the right length screws).