CRRC American National Standards Development

Last page update: September 26, 2023

The current edition of ANSI/CRRC S100 - “Standard Test Methods for Determining Radiative Properties of Materials” was approved by the American National Standards Institute (ANSI) on March 29, 2021.

ANSI/CRRC S100 Standard (2021)

The ANSI/CRRC S100 (CRRC S100) standard was revised in accordance with CRRC and ANSI requirements. The revisions to the standard derived from the CRRC, public comments, and ballot comments that were evaluated and approved by the CRRC Consensus Body during the public review process held between 2019-2020. The CRRC Consensus Body approved the revised draft standard on June 30, 2020, followed by approval by the CRRC Board of Directors on September 24, 2020, and ANSI on March 29, 2021.

Next Update of CRRC S100 Standard

The CRRC will be revising the ANSI/CRRC S100 standard (CRRC S100). The procedures governing the revision can be found here. A call for applicants for the Consensus Body was held between July 31, 2023 through September 22, 2023. The CRRC Standards Committee will evaluate applicant materials and will accept between 12-24 candidates for the Consensus Body in accordance with the CRRC Standards Procedures. Applicants will be notified in October 2023 of whether or not they have been accepted to the Consensus Body.

The Consensus Body is a balanced group of stakeholders representing three distinct interest categories:

  1. Users of the CRRC Product Rating Programs or CRRC S100 standard that specify roofing or exterior wall products for installation, for regulatory purposes, or for a voluntary program. This category includes building owners, facilities personnel, government agencies that use a CRRC Product Rating Program or CRRC S100 as the basis for regulation, organizations that have green building certification programs or rebate programs, specifiers, consultants, contractors, and building inspectors. This category also includes organizations that provide testing and weathering services (e.g., Accredited Independent Testing Laboratories and Approved Test Farms).

  2. Producers, which are companies that produce or sell roofing or exterior wall materials, as well as the associations that represent those companies; and

  3. General Interest, which are entities that do not use the CRRC Product Rating Programs or CRRC S100, and do not produce or sell roofing or exterior wall materials. This category includes independent research organizations, government agencies with an interest in energy or environmental issues (but do not establish or adopt regulations pertaining to cool roofs), non-profit organizations, and other organizations that do not directly profit from roofing product sales, but have a general interest in cool surfaces, energy sustainability, green building practices, and other related issues.


The CRRC became an ANSI-Accredited Standards Developer Organization in 2008. After a three-year standards development process, the first edition of “ANSI/CRRC S100 - Standard Test Methods for Determining Radiative Properties of Materials” (formerly CRRC-1 Standard) was approved on November 16, 2010. The standard is currently in its fourth edition (approved by ANSI on March 29, 2021).

The ANSI Essential Requirements and the CRRC's procedures specify that the process for standards development must be a collaborative, balanced, and consensus-based approval process. As such, every few years the standard must go through a public review process. As part of this process, consensus must be reached by representatives from materially-affected and interested parties. The ANSI/CRRC S100 standard was developed with input from the public and the CRRC Consensus Body, a balanced group representing diverse interests, ensuring that all aspects of the standard are considered.

The ANSI/CRRC S100 standard covers test specimen preparation and test methods for measuring the initial and aged radiative properties of roofing products. The standard is referenced by building codes and rating programs worldwide in order to measure the initial and aged solar reflectance and thermal emittance of roofing products.

Frequently Asked Questions

The ANSI/CRRC S100 standard (formerly CRRC-1 Standard) is an American National Standard developed through a consensus process in accordance with ANSI and CRRC requirements that provides a consistent reference in energy and building codes regarding the measurement of the surface radiative properties of roofing materials. The standard covers specimen preparation and test methods for measuring the initial and aged solar reflectance and thermal emittance of roofing products.

The American National Standards Institute (ANSI) is a distinguished non-profit organization that coordinates the development of voluntary consensus standards in accordance with the ANSI Essential Requirements, which requires the process for standards development to be fair, open, and balanced.

The CRRC updates the ANSI/CRRC S100 standard approximately every three years. The primary reason for updating the standard is to incorporate changes made to the CRRC's Product Rating Program that are related to radiative properties measurement, including new test methods and practices adopted by the CRRC since the last update of the ANSI/CRRC S100 standard.

Yes, proposals to update the ANSI/CRRC S100 standard or proposals for the development of a new standard can be submitted at any time. The proposer must use the CRRC Standards Proposal Submission Form. If the CRRC is proposing revisions to the ANSI/CRRC S100 standard, and the proposal is related to those proposed revisions, then the CRRC S100 Public Comment Form (only available during a CRRC public comment period) must be used.

For questions about the ANSI/CRRC S100 standard or the public review process to update the standard, please contact Sarah Schneider, (503) 606-8448 ext. 502.