My studio apartment doesn't have an attic. A lot of the installation videos and articles I read online are about installing foil insulation a couple inches below the roof and above the room's ceiling. Does it matter if I install it under the ceiling (that is, the foil barrier is visible to me when inside the apartment)?Aesthetics isn't an issue. I don't mind seeing the foil. I just want to know if I can still achieve the same results whether or not I install above the ceiling. Thanks!
If I were you I would go with 4X8 half inch foam insulation sheets from home depot. 12 bucks each and a snap to put up. You might even want to double them.
The foil would only radiate visible light back toward you, and fiberglass insulation ( or rigid polyisocyanurate panels covered with drywall) would create a barrier to keep the heat in your room. If just foil worked, you would assume no one would bother with installing 10 thick fiberglass to achieve an R-38 rating and spend thousands of dollars if a couple hundred of foil would do it.
