material. This list is subject to change without notice. Q. I see R-10, R-13 and R-19 insulation on your website. Do you have other 'R' values that are not shown? A. Yes. We can... quote faced insulation in other R-Values. For example, 8" thick material in R-25 or R-28. You may also combine different insulation thicknesses to obtain R-values up to R-40. See... thermal rating of 1" thickness of a given material; for example, a 1" thickness of fiberglass insulation may have an R-Value of 7 while a 1" thickness of space shuttle tile may have...