2021 Owens Corning Sustainability Report | Reducing Our Environmental Footprint | Responsible Water | 172 Water Risk Assessments Water-related risks and availability of supply vary across our geographies, processes, and product lines. To minimize the effect of water risk at our locations, we perform regular risk assessments using the World Resources Institute (WRI) Aqueduct Water Risk Atlas. Using the Ecodesign Strategy Wheel and life cycle assessments (LCAs), we can identify the amount of freshwater consumed during the life cycle of each of our products, and we routinely evaluate each site’s environmental footprint, as well as any changes in processes, products, regulatory statuses, or prices. In addition, the results of the annual supplier survey are provided to us, including information about whether suppliers have goals to reduce water usage and strategies for water management in water- stressed areas. Since 2018, Owens Corning has measured its water risk using WRI’s baseline water stress metric, which WRI describes as a strong proxy for all aspects of water risk to a business’s operations. As this metric takes into account the supply and demand stress of regional water withdrawal, it provides a more complete understanding of water-stressed areas. Using this approach, Owens Corning undertook our 10th annual water risk assessment in 2021 — our fourth year using baseline water stress as our metric. We used the findings of this analysis in conjunction with our sites’ 2021 water intake and discharge statistics. This assessment informs the development of water management plans to optimize water efficiency at facilities in water- stressed regions with high water demand. Our baseline water stress analysis identified that 30 of our sites that were active in 2021 were in areas classified by WRI as having high or extremely high baseline water stress. Our facilities at these sites accounted for 23% of our overall water withdrawal in 2021 as well as 26% of our overall water discharge in 2021. Read more about our water risk assessments, including an updated supply chain risk assessment, in our CDP Water Security 2022 Report, which will be published later this year on the sustainability website . Photo submitted by: Cheryl Smith | Newark, Ohio, U.S. Wildlife in Newark, Ohio. For the third year in a row, Owens Corning has made CDP’s Water A List, recognizing our transparency regarding water use and management. This program facilitates informed decision- making to achieve water resilience, better governance of water issues, incentivizing long-term water management planning, and the development of standard water metrics and performance benchmarks for better water quality and quantity. A LIST 2021 WA TER