you can then use the R-value insulation chart below to determine the level of insulation you will need to insulate your attic, ceiling, walls, floor, and crawl space. Generally, zone one will ...

Typical R-value: R-3.8 and R-6.8 per inch of thickness, depending on the type. Where commonly used: Basement and crawl space walls, and as continuous insulation on a house’s exterior.