2021 Owens Corning Sustainability Report | Overview | Message from our CEO and CSO | 5 To achieve these goals, our roadmap for progress in climate change includes raw materials and processes with lower greenhouse gas emissions; increased recycled content/circularity; energy and process efficiency improvements; more renewable energy use; and fuel switching from on-site fossil fuel use to low- or no-carbon solutions. Long-term, we’ll be working to develop and implement last-mile solutions for operational emissions through innovation and exploration of still-emerging renewable fuel technologies. In 2021, we completed two power purchase agreements that add to our existing renewable electricity commitments. Sourcing 100% renewable electricity, another goal for 2030, is an important step toward our ambition to fully decarbonize. At the same time, we’re improving the efficiency of our operations to reduce energy use and working to reduce greenhouse gas emissions throughout the value chain of our products. Lowering the embodied carbon of our products further shortens the time it takes for them to save more GHG emissions in-use than are emitted to manufacture them. This is an example of the way trends, goals, and roadmaps for sustainability inform our business. Beyond environmental footprint reduction “within” our plants, we are working to refine our understanding and set measurable goals for our impact on biodiversity and the circular economy, as well as continually seeking better ways to measure our progress on social impact priorities like inclusion and diversity. In this report, you’ll find examples, data, and perspectives that represent our results and our plans. We are proud to have received external recognition for our sustainability commitments and results — including being the first company ever to earn the No. 1 spot on the 100 Corporate Best Citizens list from 3BL Media for three years in a row. In 2021, we were named to the Dow Jones Sustainability World Index for the 12th consecutive year, and we are also listed on the DJSI North America Index, with industry-leading assessment scores. Inclusion on these lists indicates that our overall approach to environment, social, and governance aspects of our business is aligned with stakeholder expectations. Other awards, such as our 17th consecutive perfect score for LGBTQ workplace equality on the Human Rights Campaign Foundation’s Corporate Equality Index, and our placement on CDP’s Water Security A List, help us gauge our progress on specific topics. Such accolades are an honor and acknowledge the work we’ve done, but they also spur us to do more. Our network of stakeholders has expanded rapidly in recent years, and we know that more people than ever are curious about our goals and interested in our results. Not long ago, ESG-labeled funds held 9% of our shares; today, that is 14%. As we grow, we also can have a larger effect on the communities and lives we touch. The progress we’ve made so far reflects our purpose: our people and products make the world a better place. Our 2021 results, detailed in this report, speak to the dedication and commitment of our people, and give us reason for optimism despite the challenges ahead. Sharing our results and aspirations is an important part of our commitment to all our stakeholders, and we are grateful for the many people who have inspired our work and pushed us to continually do more. Brian Chambers Chairman and Chief Executive Officer Frank O'Brien-Bernini Senior Vice President and Chief Sustainability Officer