I have some extra strips of Enerflex radiant barrier that I would like to wrap around my AC line running from my compressor up to the condenser in the attic which already has a foam type (Armaflex) insulation over it. Also, I have some spots with the same situation with my water heater. I know radiant barrier works good over fiberglass, but will it work over closed cell foam? I will have to wrap it tightly and there will be some overlapping of the radiant barrier.
You may wrap the radiant barrier as you described, making sure the reflective side, if there is only one, is facing outward.