I planned to have a standing seam metal roof installed and saw your YouTube video before starting. I had a geothermal system installed the year before which included new ducts in attic. I needed temperature moderation in attic. So I showed the Amish builders paper copies of your video frames; and they went to work: Old shingles removed, their vapor barrier laid, your perforated single sided radiant barrier laid, (shiny side up) battens places on your radiant barrier, standing seam metal roof laid over battens. Attic floor holes sealed, and more cellulose insulation was then blown in the attic.
2,250 square foot two story house; plus finished basement. All three zones with HVAC maintaining 73-74 degrees F. 50-58% humidity. House is all electric, including swimming pool pump in middle of Pennsylvania. Electric bills this summer have been $140-$148 per month.
Prior to this I was shoveling and heating with coal, and had no air conditioning.
I don't want to leave the house now!