Installation Guide

Calculate.
Subtract Current Depth from
Specified Minimum thickness
for the recommended R-Value
for your zone
R-60 22.0”
R-49 18.25”
R-38 14.5”
R-30 11.5”
R-19 7.5”
Specified Minimum
Thickness
*
Current Depth
Additional
R-Value Needed
Recommended
R-Value
R49 - R60
R38 - R60
R30 - R60
R30 - R60
R30 - R49
*Existing R-Value measurement is based on average R-Value per inch across various manufacturers and technology