Insulation R-values

Before you insulate, find out the appropriate R-value for your region

US map

R-value measures how well certain building insulation materials can resist heat. The higher the R-value, the greater the insulation performance.

Adding insulation to your attic, basement or crawlspace is one the best ways to improve energy efficiency in your home. It can reduce your heating and cooling costs by 30 percent and may make you eligible for a federal tax credit.

The map and chart shows each region of the U.S., the subsequent zones and corresponding R-values. Use it to determine the amount of insulation you need to properly insulate your attic and crawl spaces.

insulation chart