Insulation R Value Comparison
Insulation Type
R Value per Inch
Insulation Type
Brick (4")
R Value per Inch
0.8
Insulation Type
Hardwood flooring (3/4")
R Value per Inch
0.68
Insulation Type
Double glazing (1/4")
R Value per Inch
1.69
Insulation Type
Solid door (1.75")
R Value per Inch
2.17
Insulation Type
Blanket insulation
R Value per Inch
2.9-3.8
Insulation Type
Open cell spray foam
R Value per Inch
3.0-3.8
Insulation Type
Closed cell spray foam
R Value per Inch
6.0-7.0
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