2021 Owens Corning Sustainability Report | Appendices | 292 EXTERNAL ASSURANCE To enhance the reliability of our recorded data, Owens Corning works to ensure transparency in disclosure on all matrices, KPIs, and mechanisms of assurance. As we move forward, we will externally assure additional topics, prioritizing based on availability of data and importance to stakeholders, as observed through our materiality assessment. SCS performed the assurance of the Owens Corning’s 2021 Sustainability Report against the AA1000 Assurance Standard (AA1000AS V3). In addition, SCS evaluated the report against the Global Reporting Initiative’s (GRI) Standards. Specific performance data were assessed using internationally recognized standards, which included, but are not limited to, the following: ■ World Resources Institute’s (WRI) Greenhouse Gas Protocol: A Corporate Accounting and Reporting Standard (Revised Edition), March 2004, along with Scope 2 and Scope 3 Guidance. ■ ISO 14064-3:2006 Specification with guidance for the validation and verification of GHG assertions. To view the assurance statement, please see Appendix F . For additional information on the economic and social metrics verified through SCS Global Services, see our Verification Statements document. Photo submitted by: Danielle Wittorp | Dearborn, Michigan, U.S. Flower bud in a home garden. Questions About the Report Any questions regarding our reporting process or this report can be directed to our chief sustainability officer: Mr. Frank O’Brien-Bernini Senior Vice President and Chief Sustainability Officer Phone: 1.419.248.8000 Email: [email protected]