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Fiberglass Insulation R-value and Thickness Comparisons
Determining the Right Fiberglass Insulation
R-values for the Different Areas of your Home
By Mark J. Donovan
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Batt and rolled fiberglass
insulation are two of the most common types of insulation found in
residential construction. Batt and rolled fiberglass insulation are available in
numerous R-values, lengths, widths, and thicknesses, and is used in walls,
floors, and attics. R-value is a measure of how well a particular type of
insulation impedes heat transfer. The R-value of batt and rolled fiberglass
insulation varies a little by manufacturer. Typically it is in the range of
2.9 to 3.8 per inch. Summarized below is a table that will enable you to
quickly compare batt and rolled fiberglass insulation R-values with
corresponding thicknesses.
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Insulation R-value |
Thickness (inches) |
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R-11 |
3 1/2 |
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R-13 |
3 5/8 |
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R-15 |
3 1/2 (High Density) |
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R-19 |
6 1/4 |
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R-21 |
5 1/2 |
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R-25 |
8 to 8 1/2 |
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R-30 |
9 1/2 |
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R-38 |
12 |
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R-49 |
15 1/2 |
How Much Batt or Rolled Fiberglass
Insulation is Required?
Well it depends upon where you live.
However summarized below are some general guidelines.
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Walls – Wall insulation is
dependent upon the type of framing used in the walls. If the walls were
constructed out of 2x4s, you can use R-11 to R-15 rolled fiberglass insulation.
If the walls were constructed out of 2x6s, you can use R-19 to R-21.
Attics – In colder climates
the U.S. Department of Energy (DOE) recommends using a minimum of R-49
insulation. You can achieve an R-49 R-value by stacking R-19 on top of R-30. In
warmer climates you can get away with R-38 insulation in the attic. |
Floors – The U.S. DOE
recommends using R-25 insulation in colder climates and R-11 in warmer ones.
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