2021 Owens Corning Sustainability Report | Our Approach | Board Leadership | 51 BOARD LEADERSHIP In the sustainability world, we often discuss ESG impacts, which refer to three key elements of our approach — environmental, social, and governance. For the governance portion of this approach, we rely on our board of directors to provide essential leadership. The individuals who serve on our board share our commitment to reducing our negative impacts, increasing our positive impacts, and maintaining ethical standards, while also ensuring the growth of the company. NAME SIGNIFICANT POSITIONS & COMMITMENTS GENDER AGE INITIAL YEAR AS A DIRECTOR ROLE Mr. Brian Chambers President, CEO, and Chair of the Board for Owens Corning Male 55 2019 Executive Mr. Eduardo E. Cordeiro* Former Executive Vice President, CFO of Cabot Corporation, Director at FMC Corporation Male 54 2019 Independent Non-Executive Director Ms. Adrienne D. Elsner* Former President, Chief Executive Officer and Director of Charlotte’s Web Holding, Inc. Former President of U.S. Snacks, Kellogg Company Female 59 2018 Independent Non-Executive Director Mr. Alfred E. Festa Former Chairman and CEO, W.R. Grace & Company Male 62 2020 Independent Non-Executive Director Mr. Edward F. Lonergan Executive Chairman of Zep, Inc., Chairman of DRB Systems Inc, Former Director of The Schwan Food Company, Senior Advisor at New Mountain Capital Male 62 2013 Independent Non-Executive Director Ms. Maryann T. Mannen* Executive Vice President and CFO of Marathon Petroleum Corporation Female 59 2014 Independent Non-Executive Director Mr. Paul E. Martin* Former Senior Vice President and Chief Information Officer for Baxter International Inc. Male 63 2021 Independent Non-Executive Director Mr. W. Howard Morris* President and Chief Investment Officer of The Prairie & Tireman Group Male 61 2007 Independent Non-Executive Director Ms. Suzanne P. Nimocks* Former Senior Partner of McKinsey & Company, Director of Ovintiv Inc, Valaris plc, and ArcelorMittal Female 63 2012 Independent Non-Executive Director Mr. John D. Williams President, CEO and Director of Domtar Corporation, Director of Form Technologies Male 67 2 011 Independent Non-Executive Director The Owens Corning Board of Directors Owens Corning’s board of directors consists of one executive director and nine independent non-executive directors. Of these 10 individuals, three are people of color and three are female. Those board members are noted with an asterisk (*) below.