Recommended R values

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Recommended R values

Recommended R values for regions of the United States

R-Value is a measure of an insulations ability to resist heat traveling through it. The higher the R-Value of an insulation, the better the thermal performance of that insulation. The table below shows what levels of insulation are cost-effective for different climates and locations in the home.

Recommended insulation levels for retrofitting existing wood-framed buildings

	Add Insulation to Attic
Zone	Uninsulated Attic	Existing 3–4 Inches of Insulation	Floor
1	R30 to R49	R25 to R30	R13
2	R30 to R60	R25 to R38	R13 to R19
3	R30 to R60	R25 to R38	R19 to R25
4	R38 to R60	R38	R25 to R30
5 to 8	R49 to R60	R38 to R49	R25 to R30

The above R-values are recommendations only. Please consult your local code official for the specific R-value required for your structure and area.

Bubble wrap insulation r value will vary dependent on the airspace size and the direction of the heat flow, and the conductive and convective properties of surrounding materials

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