Insulation R-Value

Material
R value(ft^2 °F h/Btu
Hardwood siding (1 in. thick)
0.91
Wood shingles (lapped)
0.87
Brick (4 in. thick)
4.00
Concrete block (filled cores)
1.93
Fiberglass batting(3.5 in. thick)
10.90
Fiberglass batting(6 in. thick)
18.80
Fiberglass board (1 in. thick)
4.35
Cellulose fiber(1 in. thick)
3.70
Flat glass (0.125 in thick)
0.89
Insulating glass(0.25 in space)
1.54
Air space (3.5 in. thick)
1.01
Free stagnant air layer
0.17
Drywall (0.5 in. thick)
0.45
Sheathing (0.5 in. thick)
1.32
Data from Serway/Beichner.
Modeling of heat loss from a house.
Index

Tables
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