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Select the wall system that is desired and get detailed guidelines for that system

Wall SystemPublished R-ValueU-ValuesAverage Market ValueSystem Comparison
Single Layer
R-10U-0.184as low as $0.71 / sq ft
R-11U-0.182
R-13U-0.174
Double Layer
R-20U-0.076as low as $0.93 / sq ft
R-10 vs R-20
142%
Increase
in
Performance
R-23U-0.075
R-26U-0.074

The estimated payback is 12 to 18 months, depending upon location and other factors such as windows, doors, stem walls, vent and others will also play a part as well.