How Much Insulation Do You Need In The Area You Live

Dated: 10/03/2014

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Recommended Levels of Insulation

Insulation level are specified by R-Value. R-Value is a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value the better the thermal performance of the 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

US map showing recommended insulation levels for retrofitting existing wood-framed buildingsZoneAdd Insulation to AtticFloorUninsulated AtticExisting 3–4 Inches of Insulation1R30 to R49R25 to R30R132R30 to R60R25 to R38R13 to R193R30 to R60R25 to R38R19 to R254R38 to R60R38R25 to R305 to 8R49 to R60R38 to R49R25 to R30Wall Insulation: Whenever exterior siding is removed on anUninsulated wood-frame wall:
  • Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding, and
  • Zones 3–4: Add R5 insulative wall sheathing beneath the new siding
  • Zones 5–8: Add R5 to R6 insulative wall sheathing beneath the new siding.
Insulated wood-frame wall:
  • For Zones 4 to 8: Add R5 insulative sheathing before installing the new siding.

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Carolann Newton

I was a domestic paralegal for 8 years prior to Real Estate. Since I have been in Real Estate I have grown to love this business, even though it does have it's challenges; it is very exciting. There i....

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