2021 Owens Corning Sustainability Report | Appendices | 338 UN GLOBAL COMPACT COMMUNICATION ON PROGRESS Appendix E Dear Mr. Secretary General: Owens Corning is committed to building a sustainable future through material innovation, and that is why we joined the United Nations Global Compact 11 years ago. We remain deeply committed to the 10 principles that make up this historic initiative. Our latest annual Sustainability Report demonstrates that commitment, as well as our holistic approach to sustainability. In addition to minimizing the impact of our products and operations, we have also established broad objectives aimed at balancing economic growth with social progress and environmental stewardship. We believe our approach is in the best interest of our company and our stakeholders, and it creates long-term value for our shareholders. This work resonates deeply with the sense of purpose shared by our employees around the world: Our people and our products make the world a better place. To make our shared vision a reality, we are continuously striving to advance the same principles articulated in the Global Compact, which are incorporated into our sustainability strategy and drive our company values, and which in turn guide the way we interact with our customers, suppliers, investors, and colleagues, as well as the communities in which we live and work. Through the lens of that strategy, Owens Corning has reviewed the United Nations Sustainable Development Goals and identified several that are material to our business, and on which we believe we have direct impact through our core business competencies. We also identified those where we can have either direct or indirect influence. For those aligned with our material issues, active programs and reporting are already underway. This work is included in our 2021 Sustainability Report, which is attached. Many of Owens Corning’s sustainability efforts have been recognized by organizations that evaluate our progress against high standards and industry benchmarks. In 2021, Owens Corning was named to the Dow Jones Sustainability World Index for the twelfth consecutive year. Additionally, Owens Corning earned placement on the Dow Jones Sustainability North America Index for a fourth year, with industry-leading scores. The North America Index tracks the sustainability leaders in the largest U.S. and Canadian companies in the S&P Global Broad Market Index. Companies are selected for inclusion in the Dow Jones Sustainability Index in part based on their scores in the S&P Global Corporate Sustainability Index. Owens Corning placed in the 100th percentile for the building products industry. The company’s 2021 scores in each dimension — economic, environmental, and social — are also in the 100th percentile for the industry. In addition, Owens Corning received many awards and distinctions for our corporate citizenship efforts in 2021. We again earned the top spot on the 100 Best Corporate Citizens List, making us the first company to earn the top ranking for three consecutive years. We also once again received recognition from the Ethisphere Institute as one of the world’s most ethical companies, for the fourth consecutive year. The company is one of only two honorees in the Construction and Building Materials industry. March 24, 2022 H.E. António Guterres Secretary-General United Nations New York, NY 10017 OWENS CORNING WORLD HEADQUARTERS ONE OWENS CORNING PARKWAY TOLEDO, OHIO 43659 419.248.8000