Exhibit 99.1 ($ in millions, except per share amounts) Third-Quarter Nine Months NEWS RELEASE Owens Corning Delivers Net Sales of $3.0 Billion; Generates Net Earnings of $321 Million and Adjusted EBIT of $582 Million TOLEDO, Ohio – November 6, 2024 – Owens Corning (NYSE: OC), a residential and commercial building products leader, today reported third-quarter 2024 results. • Reported Net Sales of $3.0 Billion, a 23% Increase from Prior Year, with Newly Acquired Doors Business Contributing $573 Million in Rev ...