The R-value depends on the type of insulation and the thickness. In general, 3-inch insulation is R-10, 4-inch insulation is R-13 and 6-inch insulation is R-19. For more information, see the section on fiberglass.
What is radiant barrier, and what is its R-value?
Briefly, it works on exactly the same principles that allow a thermos bottle to keep hot coffee hot and iced tea cold. For a full description, see the section on reflective foil.
Briefly, it works on exactly the same principles that allow a thermos bottle to keep hot coffee hot and iced tea cold. For a full description, see the section on reflective foil.
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