Determining the Right Fiberglass Insulation R-values for the Different Areas of your Home
By Mark J. Donovan
|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.
How Much Batt or Rolled Fiberglass Insulation is Required?
Well it depends upon where you live. However summarized below are some general guidelines.
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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