Jay writes from Cadyville, New York: "What do you think about using 2 inch foil faced rigid r13 plus r15 unfaced with poly on interior for a 2x6 wall? Any vapor problems, you think?"

Answer: The application you describe should work just fine. As long you keep your interior space conditioned there should be no moisture problems. The foil-faced material is not made by Owens Corning so if you have questions about the product, I recommend contacting the manufacturer.