I am using a radiant barrier in my garage to insulate it and keep all the stuff from falling into my garage as I do my roof! Two birds with one stone! The insulation is just keeping the hot air in between the insulation and the roof. The way that I stapled the foil in between the rafters will allow me to add a second layer of insulation over the rafters if I need it! Don't forget to like, subscribe, and hit the notification bell to see my latest videos! Thanks for watching!