radiant barrier sheathing: how does it work? #green
From the literature it seems that it doesn't matter which side of the foil the radiation is on, as long as there's at least 3/4" air space on one side of the foil or the other. I always thought the air space (which is why you're supposed to staple foil faced batts to the side of the studs, not the face) had to be between the foil and the radiation you want to reflect. With TechShield, they advertise that +90% of solar energy will be reflected away from your attic with the foil facing down, the air space being on the opposite side from the radiation being deflected. Totally counter intuitive, right? I don't get it.