Brad, they sell the stuff to lay over insulation as I remember. I also remember confetti like flakes you sprayed over the fiberglass or cellulose that was also intended to act as a radiant barrier. Either way in a perfect world it works great but since we don’t live there it hardly does anything.
I’ll agree with you as I’m not sure but still, I would not write it up as a defect. How would you explain that if asked?