The map and chart show each region of the U.S., the subsequent zones and corresponding R-values. 

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic, walls, floors and crawlspaces.

The higher the R-value, the better the thermal performance of the insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. 

In exterior walls, add insulating sheathing to achieve a greater R-value in your wall system.