R-Values on Different Reports in Ekotrope

Modified on Tue, 8 Aug, 2023 at 10:38 AM

Different reports in Ekotrope can show different insulation R-Values for envelope components in your project. Some reports will show the "nominal" value, while others will report the "effective" value. The difference between these two values is explained below:

Nominal R-Value	This is the “labeled rating” of the insulation material(s) before installation. This will be the sum of all of the insulation materials' R-values that are entered into the wall assembly.
Effective R-Value	This is the thermal resistivity of the insulation post-installation, which looks at the entire assembly and takes things like thermal bridging into account. This is what is shown on the assembly calculator. It may be lower than the nominal r-value.

The reports in Ekotrope that show the Nominal R-Value are as follows:

HERS Certificate
HERS Certificate (As-Modeled)
HERS Label
ENERGY STAR Certificates
IECC Certificates

The reports in Ekotrope that show the Effective R-Value are as follows:

HERS Rated/Reference Home Summaries
IECC Proposed/Reference Home Summaries
NGBS Proposed/Reference Home Summaries
Building Specification Summary
Building Summary