Important RESNET® Amendment on Rating Software Changes (Persistence)

RESNET Adopts Standard Amendment on Persistence of the Use of Previous Versions of HERS Software When Standards Change

The latest release of Rating software, represented by the new ANSI/RESNET/ICC 301-2014, has dramatically demonstrated an issue that has been apparent for quite some time. To further expand on how various software versions impact changes to HERS Index scores, and how the recently adopted amendment, effective February 16, 2017, applies, please review the following:

  • When standards and software are updated, the HERS Index score can change.  In the case of ANSI/RESNET/ICC 301-2014 the score change is dramatic.
  • As the HERS Index continues to grow in our national vocabulary, consistency of the scoring system becomes increasingly important.

As the standards are currently written, homes in a community with a buildout of twenty years can use old software because software does not have to be updated due to the notion of “Persistence”. If left open to interpretation, one Projected Rating could be applied to multiple building permits in production housing, allowing “Persistence” based on a Projected Rating to extend the use of older software versions to 5, 10, or even 20 years.

After the RESNET Standard Public Review and Comment process, the RESNET Standards Management Board has adopted Amendment #2017-01.

  • The amendment requires that “Confirmed or Sampled Ratings on homes with a building permit date that is on or after the six-month anniversary of the release of the software must utilize the newly released software.
  • Homes with a building permit date before the six-month anniversary of the release of the software will be allowed to complete a Confirmed or Sampled Rating based on the previous version of the software that was utilized for the Projected Rating.”

The amendment also allows the RESNET Board of Directors to stipulate a timeframe other than the six-month anniversary of the building permit date.  The RESNET Board of Directors has not used this clause to date.

The adopted amendment is posted at RESNET Standard Amendment #2017-01

The amendment goes into effect on February 16, 2017.

Link to related article: HERS® Rating Scores Going Up

Robby Schwarz

 

Who to Contact:

Robby Schwarz
Principal, Director of Builder Relations

Email Robby
720-838-0677

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