What R-value Do I Need?

Depending on where you live and the part of your home you’re insulating (walls, crawlspace, attic, etc.), you’ll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.

Use the JM insulation calculator to determine the recommended R-value for your project, as well as how much insulation you’ll need. Plus, reference the Department of Energy’s (DOE) map of recommended levels of insulation below.

Energy Star Recommendations


Related Pages

= view sheets

What is R-Value?

R stands for resistance to heat flow. The higher the R-Value, the greater the insulating power and resistance to heat flow.

How Much Product Do I Need?

The amount of insulation needed depends on the type of insulation you're using, the R-Value you want to achieve, and the size of the space you're insulating.