The prerequisite (EA2.1) requires that insulation be installed to meet or exceed the R-value requirements in Chapter 4 of the 2004 International Energy Conservation Code (IECC), that it be installed to meet the Grade II specification set by the National Home Energy Rating Standards (HERS), and that the installation be verified by an energy rater or “green rater” conducting a pre-drywall thermal bypass inspection. The credit (EA2.2) awards 2 points if, in addition to meeting the prerequisite, the IECC R-values are exceeded by at least 5% and the insulation is installed to meet the HERS Grade I specifications. (Note that in LEED for Homes, EA1 is a “bundled” credit, meaning that if it is earned, the “a la carte” credits EA2 through EA6 may not be earned. Therefore, EA1 and EA2 are mutually exclusive; this is because EA1 comprises the performance standards in EA2 as well as EA3-6.) Spray Polyurethane Foam, because of its higher R-value per inch and performance characteristics, can contribute to projects earning this credit.