Exhibit 21.1
| Subsidiaries of Owens Corning (12/31/2019) | State or Other Jurisdiction Under the Laws of Which Organized | ||||
| 0979301 B.C. ULC | Canada | ||||
| AS Paroc | Estonia | ||||
| Crown Mfg. Inc. | Canada | ||||
| Deutsche Foamglas GmbH | Germany | ||||
| Dutch OC Coöperatief Invest U.A. | The Netherlands | ||||
| European Owens Corning Fiberglas SPRL | Belgium | ||||
| Finefiber (Shanghai) Building Material Co. Ltd. | China | ||||
| Finefiber Insulation Co. Pte. Ltd. | Singapore | ||||
| FOAMGLAS (Italia) SRL | Italy | ||||
| FOAMGLAS (Nordic) AB | Sweden | ||||
| IBCO SRL | Barbados | ||||
| International Packaging Products Pvt. Ltd. | India | ||||
| InterWrap (Hong Kong) Ltd. | Hong Kong | ||||
| InterWrap (Qingdao) Trading Co., Ltd. | China | ||||
| InterWrap Corp. | Oregon | ||||
| InterWrap Corp. Private Ltd. | India | ||||
| Inversiones Owens Corning Chile Holdings Limitada | Chile | ||||
| IPM Inc. | Delaware | ||||
| OC Canada Finance Inc. | Canada | ||||
| OC Canada Holdings General Partnership | Delaware | ||||
| OC Celfortec Company | Nova Scotia | ||||
| OC Latin American Holdings GmbH | Austria | ||||
| OC NL Invest Coöperatief U.A. | The Netherlands | ||||
| OC PRO CV | The Netherlands | ||||
| OCCV1, Inc. | Delaware | ||||
| OCCV2, LLC | Delaware | ||||
| OCV (Thailand) Co. Limited | Thailand | ||||
| OCV Chambéry France | France | ||||
| OCV Chambéry International | France | ||||
| OCV Finance, LLC | Delaware | ||||
| OCV Intellectual Capital, LLC | Delaware | ||||
| OCV Italia Srl | Italy | ||||
| OCV Mexico S. de R.L. de C.V. | Mexico | ||||
| OCV Servicios Mexico, S.A. de C.V. | Mexico | ||||
| OC Steklovolokno AO | Russia | ||||
| OOO Paroc | Russia | ||||
| Owens Corning (Australia) Pty Limited | Australia | ||||
| Owens Corning (China) Investment Company Limited | China | ||||
| Owens Corning (Guangzhou) Fiberglas Co., Ltd. | China | ||||
| Owens Corning (Guangde) Rock Wood Manufacturing Co., Ltd | China | ||||
| Owens Cornings (Hangzhou) Fiberglass Co., Ltd. | China | ||||
| Owens Corning (Nanjing) Building Materials Co., Ltd. | China | ||||
| Owens Corning (Shanghai) Fiberglas Co., Ltd. | China | ||||
| Owens Corning (Singapore) Pte Ltd | Singapore | ||||
| Owens Corning (Tianjin) Building Materials Co., Ltd. | China | ||||
| Owens Corning (Xi’an) Building Materials Co., Ltd. | China | ||||
| Owens Corning Alloy Canada GP Inc. | Canada | ||||
| Owens Corning Alloy Canada LP | Canada | ||||
| Owens Corning Argentina Sociedad de Responsabilidad Limitada | Argentina | ||||
| Owens Corning Automotive, LLC | Delaware | ||||
| Owens Corning BM (Korea), Ltd | Korea | ||||
| Owens-Corning Britinvest Limited | United Kingdom | ||||
| Owens Corning Canada GP Inc. | Canada | ||||
| Owens Corning Canada Holdings B.V. | The Netherlands | ||||
| Owens Corning Canada Holdings ULC | Canada | ||||
| Owens Corning Canada LP | Canada | ||||
| Owens Corning Cayman (China) Holdings | Cayman Islands | ||||
| Owens-Corning Cayman Limited | Cayman Islands | ||||
| Owens Corning Celfortec Canada GP Inc. | Canada | ||||
| Owens Corning Celfortec LP | Canada | ||||
| Owens Corning Composite Materials Canada GP Inc. | Canada | ||||
| Owens Corning Composite Materials Canada LP | Canada | ||||
| Owens Corning Composite Materials, LLC | Delaware | ||||
| Owens Corning Composites (Beijing) Co., Ltd. | China | ||||
| Owens Corning Composites (China) Co., Ltd. | China | ||||
| Owens Corning Construction Services, LLC | Delaware | ||||
| Owens Corning Corporate Services, LLC | Delaware | ||||
| Owens Corning CV GP, LLC | Delaware | ||||
| Owens Corning Elaminator Insulation Systems, LLC | Delaware | ||||
| Owens Corning Enterprise (India) Pvt. Ltd. | India | ||||
| Owens Corning Fabrics (Changzhou) Co., Ltd. | China | ||||
| Owens Corning Fiberglas (U.K.) Pension Plan Ltd. | United Kingdom | ||||
| Owens Corning Fiberglas A.S. Limitada | Brazil | ||||
| Owens-Corning Fiberglas Deutschland GmbH | Germany | ||||
| Owens Corning Fiberglas Espana, SL | Spain | ||||
| Owens Corning Fiberglas France | France | ||||
| Owens Corning Financial Services ULC | Canada | ||||
| Owens Corning Finland Oy | Finland | ||||
| Owens Corning Foam Insulation, LLC | Delaware | ||||
| Owens-Corning Funding Corporation | Delaware | ||||
| Owens Corning GlassMetal Services (Suzhou) Co., Ltd. | China | ||||
| Owens Corning Global Holdings Limited Partnership | Canada | ||||
| Owens Corning Global Holdings II Limited Partnership | Canada | ||||
| Owens Corning Holdings 1 CV | The Netherlands | ||||
| Owens Corning Holdings 3 CV | The Netherlands | ||||
| Owens Corning Holdings 4 CV | The Netherlands | ||||
| Owens Corning Holdings 5 CV | The Netherlands | ||||
| Owens Corning Holdings Holland B.V. | The Netherlands | ||||
| Owens Corning HOMExperts, Inc. | Delaware | ||||
| Owens Corning Hong Kong Limited | Hong Kong | ||||
| Owens Corning HT, Inc. | Delaware | ||||
| Owens Corning (India) Private Limited | India | ||||
| Owens Corning Industries (India) Private Limited | India | ||||
| Owens Corning Infrastructure Solutions, LLC | Delaware | ||||
| Owens Corning Insulating Systems, LLC | Delaware | ||||
| Owens Corning Insulating Systems Canada GP Inc. | Canada | ||||
| Owens Corning Insulating Systems Canada LP | Canada | ||||
| Owens Corning Intellectual Capital, LLC | Delaware | ||||
| Owens Corning International Holdings C.V. | The Netherlands | ||||
| Owens Corning InterWrap Canada GP Inc. | Canada | ||||
| Owens Corning InterWrap Canada LP | Canada | ||||
| Owens Corning Japan, LLC | Japan | ||||
| Owens Corning Kohold B.V. | The Netherlands | ||||
| Owens Corning Korea | Korea | ||||
| Owens Corning Mexico, S. de R.L. de C.V. | Mexico | ||||
| Owens Corning Mineral Wool, LLC | Delaware | ||||
| Owens Corning Non-Woven - Blythewood, LLC | Delaware | ||||
| Owens Corning Non-Woven Technology, LLC | Delaware | ||||
| Owens Corning Receivables LLC | Delaware | ||||
| Owens Corning Reinforcements (Hangzhou) Co., Ltd. | China | ||||
| Owens Corning Remodeling Systems, LLC | Delaware | ||||
| Owens Corning Roofing and Asphalt, LLC | Delaware | ||||
| Owens Corning Roofing, S. de R.L. de C.V. | Mexico | ||||
| Owens Corning Sales, LLC | Delaware | ||||
| Owens Corning Science and Technology, LLC | Delaware | ||||
| Owens Corning Supplementary Pension Plan Limited | United Kingdom | ||||
| Owens Corning Technical Fabrics, LLC | Delaware | ||||
| Owens Corning Treasury Services, LLC | Delaware | ||||
| Owens Corning U.S. Holdings, LLC | Delaware | ||||
| Owens-Corning Veil Netherlands B.V. | The Netherlands | ||||
| Owens-Corning Veil U.K. Ltd. | United Kingdom | ||||
| Paroc AB | Sweden | ||||
| Paroc GmbH | Germany | ||||
| Paroc Group Oy | Finland | ||||
| Paroc Limited | United Kingdom | ||||
| Paroc Oy Ab | Finland | ||||
| Paroc Polska Sp. z o.o. | Poland | ||||
| Pittsburgh Corning (United Kingdom) Limited | United Kingdom | ||||
| Pittsburgh Corning (Yantai) Insulation Materials Co., Ltd | China | ||||
| Pittsburgh Corning Asia Limited | Hong Kong | ||||
| Pittsburgh Corning, LLC | Delaware | ||||
| Pittsburgh Corning CR, S.R.O. | Czech Republic | ||||
| Pittsburgh Corning Europe N.V. | Belgium | ||||
| Pittsburgh Corning France | France | ||||
| Pittsburgh Corning Gesellschaft m.b.h. | Austria | ||||
| Pittsburgh Corning Nederland B.V. | The Netherlands | ||||
| Pittsburgh Corning Singapore Pte., Ltd | Singapore | ||||
| Pittsburgh Corning Suisse SA | Switzerland | ||||
| Qingdao Novia Polymer Co., Ltd. | China | ||||
| SIA Paroc | Latvia | ||||
| Soltech, Inc. | Kentucky | ||||
| Thermafiber, Inc. | Delaware | ||||
| Transandina de Comercio S.A. | Chile | ||||
| UAB Paroc | Lithuania | ||||