5000 4000 3000 2000 1000 ABSOLUTE METRIC TONS  Waste-to-Landfill 1,875 1,308 2,184 1,976  Recycled Internally (on-site) 961 835 824 812  Incinerated with Energy Recovery 39 2,916 355 664  Recycled Externally (off-site) 652 508 294 495  Controlled Confinement* 255 177 197 217  Incinerated without Energy Recovery 422 208 168 295  Treated and Recycled 91 235 52 65 TOTAL 4,295 6,186 4,074 4,524 Hazardous Waste by Disposal Method (Metric Tons) Hazardous Waste by Business (Metric Tons) 2018 2019 2020 2021 Corporate 24 20 27 22 Composites 1,769 1,136 940 1,074 Insulation 2,481 5,002 3,052 3,398 Roofing 21 29 55 30 GRAND TOTAL 4,295 6,186 4,074 4,524 In 2021, 60% of our total waste generated was recycled. This includes the categories Recycled Internally (on-site), Recycled Externally (off-site), Recycled Internally with External Processing, Treated and Recycled, and Cross-Plant Recycle for both hazardous and non-hazardous waste. 2018 2019 2020 2021 ENVIRONMENTAL DATA WASTE DATA Appendix C 2021 Owens Corning Sustainability Report | Appendices | 326 * Owens Corning considers Controlled Confinement as Waste-to-Landfill for reporting purposes.