Document

Exhibit 21.1


Subsidiaries of Owens Corning (12/31/2023)			State or Other Jurisdiction Under the Laws of Which Organized
0979301 B.C. ULC			Canada
AS Paroc			Estonia
Deutsche FOAMGLAS GmbH			Germany
Dutch OC Coöperatief Invest U.A.			The Netherlands
European Owens Corning Fiberglas SRL			Belgium
Fiberteq, LLC			Delaware
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 Private Limited			India
InterWrap (Hong Kong) Ltd.			Hong Kong
InterWrap Corp.			Oregon
InterWrap Corp Private Limited			India
IPM Inc.			Delaware
Natural Polymers, LLC			Delaware
OC Canada Holdings General Partnership			Delaware
OC Latin American Holdings GmbH			Austria
OC NL Invest Coöperatief U.A.			The Netherlands
OCV Chambéry France			France
OCV Chambéry International			France
OCV Italia Srl			Italy
OCV Mexico S. de R.L. de C.V.			Mexico
Owens Corning (China) Investment Company Limited			China
Owens Corning (China) Investment Company Limited Guangzhou Branch			China
Owens Corning (Guangzhou) Fiberglas Co., Ltd.			China
Owens Corning (Guangde) Rock Wool Manufacturing Co., Ltd			China
Owens Corning (Hangzhou) Fiberglass Co., Ltd.			China
Owens Corning (Hangzhou) Fiberglass Co., Ltd Beijing Branch			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 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 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 Management Services, LLC			Delaware
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 Composites (China) Co., Ltd. - Shanghai Branch			Shanghai
Owens Corning Construction Services, LLC			Delaware
Owens Corning Corporate Services, LLC			Delaware
Owens Corning Elaminator Insulation Systems, LLC			Delaware
Owens Corning Engineered Components, LLC			Delaware
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 GlassMetal Services (Suzhou) Co., Ltd.			China
Owens Corning Global Holdings Limited Partnership			Canada
Owens Corning Global Holdings II Limited Partnership			Canada
Owens Corning Holdings Holland B.V.			The Netherlands
Owens Corning Hong Kong Limited			Hong Kong
Owens-Corning (India) Private Limited			India
Owens Corning Infrastructure Solutions, LLC			Delaware
Owens Corning Insulating Materials, 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 Insulation (India) Private Limited			India
Owens Corning Insulation Management Services, LLC			Delaware
Owens Corning Intellectual Capital, LLC			Delaware
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 Technology, LLC			Delaware
Owens Corning Non-Woven - Blythewood, LLC			Delaware
Owens Corning Receivables LLC			Delaware
Owens Corning Reinforcement Solutions, LLC			Delaware
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 Roofing Management Services, LLC			Delaware
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 Veil Netherlands B.V.			The Netherlands
Owens-Corning Veil U.K. Ltd.			United Kingdom
Owens Corning Venture Investments, LLC			Delaware
Paroc AB			Sweden
Paroc Danmark (Branch of Paroc AB)			Denmark
Paroc AB Norge (Branch of Paroc AB)			Norway
Paroc GmbH			Germany
Paroc Group Oy			Finland
Owens Corning Insulation (UK) Limited			United Kingdom
Paroc Oy Ab			Finland
Paroc Polska Sp. Z o.o.			Poland
Pittsburgh Corning (Yantai) Insulation Materials Co., Ltd.			China
Pittsburg Corning (Yantai) Insulation Materials Co., Ltd. - Shanghai Branch			China
Pittsburgh Corning Asia Limited			Hong Kong
Pittsburgh Corning, LLC			Delaware
Pittsburgh Corning CR, s.r.o.			Czech Republic
Pittsburgh Corning Europe NV			Belgium
Pittsburg Corning Europe NV - Dubai Branch			Dubai
Pittsburgh Corning France			France
Pittsburgh Corning Gesellschaft m.b.H.			Austria
Pittsburgh Corning Nederland B.V.			The Netherlands
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
Vliepa GmbH Vlies-, Papier- und Kunststoffveredlung, Lösungen für die Bau-, Papier- und Verpackungsindustrie			Germany