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Are You Unsure of The Efficiency of Your Insulation?
Measure what you have, then use the following chart to determine
the R-value of your insulation. The higher the R-value, the more
energy savings you can expect.
|
Insulation Type
|
Approx. R/Inch
|
Approximate Inches Needed:
|
|
Loose Fill Machine-Blown
|
R-11
|
R-19
|
R-22
|
R-30
|
R-38
|
R-49
|
|
Fiberglass
|
R2.25 |
5
|
8.5
|
10
|
13.5
|
17
|
22
|
|
Mineral Wool
|
R3.125
|
3.5
|
6
|
7
|
10
|
12.5
|
16
|
|
Cellulose
|
R3.7
|
3
|
5.5
|
6
|
8.5
|
10.5
|
13.5
|
|
Loose Fill Hand-poured
|
|
|
|
|
|
|
|
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Fiberglass
|
R2.25
|
5
|
8.5
|
10
|
13.5
|
17
|
22
|
|
Mineral Wool
|
R3.125
|
3.5
|
6
|
7
|
10
|
12.5
|
16
|
|
Cellulose
|
R3.7
|
3
|
5.5
|
6
|
8.5
|
10.5
|
13.5
|
|
Vermiculite
|
R2.1
|
5.5
|
9
|
10.5
|
14.5
|
18
|
23.5
|
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Batts or Blankets
|
|
|
|
|
|
|
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Fiberglass
|
R3.14
|
3.5
|
6
|
7
|
10
|
12.5
|
16
|
|
Mineral Wool
|
R3.14
|
3.5
|
6
|
7
|
10
|
12.5
|
16
|
|
Rigid Board
|
|
|
|
|
|
|
|
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Polystyrene Beadboard
|
R3.6
|
3
|
5.5
|
6.5
|
8.5
|
10.5
|
14
|
|
Extruded Polystyrene
|
R4-5.41
|
3-2
|
5-3.5
|
5.5-4
|
7.5-5.5
|
9.5-7
|
12.5
|
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(Styrofoam) Urethane
|
R5.4-6.2
|
2
|
3
|
3.5
|
5
|
6.5
|
8
|
|
Fiberglass
|
R4
|
3
|
5
|
5.5
|
7.5
|
9.5
|
12.5
|
*All numbers are approximate; please review the manufacturer's
specifications on any insulation you consider to determine the exact
thickness needed for the R-value you desire.
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