insulating underneath the radiant heating is really important. I’ve done some research on radiant barriers and feel like an appropriate barrier might do as good or better than aluminum plating. Check with your manufacturer to see what they recommend when using this (type of radiant barrier/type of insulation)with the system that you’re going to install. If it was my house, I’d try it! Good luck! (I just don’t know if anyone else has tried it or is using it yet!)