The R-Value of Insulation

An R-value indicates an insulation's resistance to heat flow. The higher the R-value, the greater the insulating effectiveness. The R-value depends on the type of insulation and includes its material, thickness, and density. When calculating the R-value of a multilayered installation, add the R-values of the individual layers. Installing more insulation in your home increases the R-value and the resistance to heat flow.

Insulation Type R-Value per inch Typical Application
Cellulose, loose fill 3.7 Attic Floor
Cellulose, high density 3.2 Walls, Enclosed Cavities
Fiberglass, bats 3.0* Basement Ceiling, Open Studs walls, Attic Floor*
Fiberglass, loose fill 2.8 Attic Floor, Walls (existing)
Rockwood, loose or bats 3.0 Basement Ceiling, Open Studs walls, Attic Floor*
* Properly installed Source: Building Performance Institute INC.

R-Value Recommendations for Existing Homes
Rochester, NY and surrounding areas
Insulation Location R-Value Notes
Attic 49 Attic Floor
Wood framed wall cavity 15 Walls, Enclosed Cavities
Floor 25 Basement Ceiling, Open Studs walls, Attic Floor*

Source: Department of Energy


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Rochester, NY

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