I have a new 16' x 24' A-Shed "super barn" that I'd like to insulate and drywall. My goal is to insulate the entire building (walls and ceiling) in the exact same way. Since I want to maximize my R value, I am considering adding some kind of radiant barrier or radiant insulation as well.....before adding the regular bats of R-13 fiberglass insulation. My question is this; would it be best to staple the radiant stuff against the OSB sheathing (directly against the inside surface of the wall and roof sheeting), or would it be best to fill the open stud wall cavities with the fiberglass insulation, THEN apply the rolls of radiant barrier to the interior sides of the studs instead? If the latter, then ultimately the drywall would be installed directly on top of the radiant barrier, so I'm not sure how that would work. The first options seems the most logical to me since the drywall would then attach properly on the studs, but a friend of mine suggests I will get better insulating properties, vapor sealing and ease of installation by running it over the studs instead. I hope I've explained this clearly....any info would be greatly appreciated!