Tag: whole-wall R-value

Prime:  prime Subtitle:  There’s a lot more to insulation than the number on the package Images:  We talk about R-valueMeasure of resistance to heat flow; the higher the R-value, the lower the heat loss. The inverse of U-factor. all the time. “I’ve got an R-19 wall,” or “Code requires R-38 in my ceiling.” But what…