Document

Exhibit 21.1


Subsidiaries of Owens Corning (12/31/2024)			State or Other Jurisdiction Under the Laws of Which Organized
0979301 B.C. ULC			Canada
0993477 B.C. Unlimited Liability Company			Canada
AS Paroc			Estonia
BetterDoor, LLC			United States
Bridgeview Investments LLC			United States
Crown Door Corp			Canada
Deutsche FOAMGLAS GmbH			Germany
Door Installation Specialists Corporation			United States
Door-Stop International Limited			United Kingdom
Dutch OC Cooperatief Invest U.A.			Netherlands
Eger Properties			United States
Endura Products Tennessee, LLC			United States
Endura Products, LLC			United States
EPI Holdings, Inc.			United States
European Owens Corning Fiberglas SPRL			Belgium
Evergreen Finance LP			United States
Fiberteq, LLC			United States
Finefiber (Shanghai) Building Material Co. Ltd.			China
Finefiber Insulation Co. Pte Ltd.			Singapore
Fleetwood Aluminum Products, LLC			United States
FOAMGLAS (Italia) Srl			Italy
FOAMGLAS (Nordic) AB			Sweden
Grecian Olive S.A.			Costa Rica
Gust of Wind S.A.			Costa Rica
IBCO SRL			Barbados
Indian Rose S.A.			Costa Rica
International Packaging Products Pvt. Ltd.			India
InterWrap (Hong Kong) Ltd.			Hong Kong
InterWrap Corp.			United States
InterWrap Corp. Pvt. Ltd.			India
Inversiones Premdor S.A.			Costa Rica
IPM Inc.			United States
Liora Enterprises Limited			Cyprus
Liquid Pearls S.A.			Costa Rica
Masonite (Shanghai) Trading Company Limited			China
Masonite Chile Holdings S.A.			Chile
Masonite Chile S.A.			Chile
Masonite Components Unlimited Company			Ireland
Masonite Corporation			United States
Masonite Costa Rica S.A.			Costa Rica
Masonite Distribution LLC			United States
Masonite Europe Limited			United Kingdom


Masonite Europe Unlimited Company			Ireland
Masonite Finance Corp			Cayman
Masonite International ULC			Canada
Masonite Investments GP, LLC			United States
Masonite Ireland Unlimited Company			Ireland
Masonite Luxembourg S.arl			Luxembourg
Masonite Mexico, S.A. de C.V.			Mexico
Masonite PL Sp z.o.o.			Poland
Natural Polymers, LLC			United States
OC Canada Holdings General Partnership			Canada
OC Latin American Holdings GmbH			Austria
OC NL Invest Cooperatief U.A.			Netherlands
OCV Chambery France			France
OCV Chambery 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 (Guangde) Rock Wool Manufacturing Co. Ltd.			China
Owens Corning (Guangzhou) Fiberglas Co., Ltd.			China
Owens Corning (Hangzhou) Fiberglass Co., Ltd.			China
Owens Corning (Hangzhou) Fiberglass Co., Ltd. Nanjing Branch			China
Owens Corning (Nanjing) Building Materials 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			United States
Owens Corning BM (Korea), Ltd			Korea
Owens Corning Canada GP Inc			Canada
Owens Corning Canada Holdings ULC			Canada
Owens Corning Canada LP			Canada
Owens Corning Cayman (China) Holdings			Cayman
Owens Corning Celfortec Canada GP Inc.			Canada
Owens Corning Celfortec LP			Canada
Owens Corning Composite Management Services, LLC			United States
Owens Corning Composite Materials Canada GP Inc.			Canada
Owens Corning Composite Materials Canada LP			Canada
Owens Corning Composite Materials, LLC			United States
Owens Corning Composites (Beijing) Co., Ltd.			China
Owens Corning Composites (China) Co., Ltd.			China
Owens Corning Composites (China) Co., Ltd. Shanghai Branch			China
Owens Corning Construction Services, LLC			United States
Owens Corning Corporate Services, LLC			United States
Owens Corning Elaminator Insulation Systems, LLC			United States


Owens Corning Engineered Components, LLC			United States
Owens Corning Fabrics (Changzhou) Co., Ltd.			China
Owens Corning Fiberglas A.S. Limitada			Brazil
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			United States
Owens Corning GlassMetal Services (Suzhou) Co., Ltd			China
Owens Corning Global Holding II LP			Canada
Owens Corning Global Holdings LP			Canada
Owens Corning Holdings Holland B.V.			Netherlands
Owens Corning Hong Kong Limited			Hong Kong
Owens Corning Infrastructure Solutions, LLC			United States
Owens Corning Insulating Materials, LLC			United States
Owens Corning Insulating Systems Canada GP Inc.			Canada
Owens Corning Insulating Systems Canada LP			Canada
Owens Corning Insulating Systems, LLC			United States
Owens Corning Insulation (India) Private Limited			India
Owens Corning Insulation (UK) Ltd.			United Kingdom
Owens Corning Insulation Management Services, LLC			United States
Owens Corning Intellectual Capital, LLC			United States
Owens Corning InterWrap Canada GP Inc.			Canada
Owens Corning InterWrap Canada LP			Canada
Owens Corning Japan, LLC			Japan
Owens Corning Korea			Korea
Owens Corning Mexico, S. de R.L. de C.V.			Mexico
Owens Corning Mineral Wool, LLC			United States
Owens Corning Non-Woven Blythewood, LLC			United States
Owens Corning Non-Woven Technology, LLC			United States
Owens Corning Receivables LLC			United States
Owens Corning Remodeling Systems, LLC			United States
Owens Corning Roofing and Asphalt, LLC			United States
Owens Corning Roofing Management Services, LLC			United States
Owens Corning Roofing, S. de R.L. de C.V.			Mexico
Owens Corning Sales, LLC			United States
Owens Corning Science and Technology, LLC			United States
Owens Corning Supplementary Pension Plan Limited			United Kingdom
Owens Corning Technical Fabrics, LLC			United States
Owens Corning Treasury Services, LLC			United States
Owens Corning Venture Investments, LLC			United States
Owens-Corning (India) Private Limited			India
Owens-Corning Britinvest Limited			United Kingdom
Owens-Corning Cayman Limited			Cayman


Owens-Corning Fiberglas (UK) Pension Plan Ltd			United Kingdom
Owens-Corning Fiberglas Deutschland GmbH			Germany
Owens-Corning Veil Netherlands B.V.			Netherlands
Owens-Corning Veil U.K. Ltd.			United Kingdom
Paroc AB			Sweden
Paroc AB Norge			Norway
Paroc Danmark filial af Paroc AB			Denmark
Paroc GmbH			Germany
Paroc Group Oy			Finland
Paroc Oy Ab			Finland
Paroc Polska Sp. Z o.o.			Poland
Peach Acquisition, Inc.			United States
Perfect!Wood Profiles, LLC			United States
Pintu Acquisition Company, Inc.			United States
Pittsburgh Corning (Suisse) SA			Switzerland
Pittsburgh Corning (Yantai) Insulation Materials Co. Ltd.			China
Pittsburgh Corning (Yantai) Insulation Materials Co. Ltd. Shanghai Branch			China
Pittsburgh Corning Asia Ltd.			Hong Kong
Pittsburgh Corning CR, s.r.o.			Czech Republic
Pittsburgh Corning Europe N.V.			Belgium
Pittsburgh Corning Europe N.V. Dubai Branch			Belgium
Pittsburgh Corning France			France
Pittsburgh Corning Nederland B.V.			Netherlands
Pittsburgh Corning, Gesellschaft mbH			Austria
Pittsburgh Corning, LLC			United States
Premdor Crosby Limited			United Kingdom
Premdor Karmiel Holdings B.V.			Netherlands
Premdor Ltd			Israel
Premdor U.K. Holdings Limited			United Kingdom
Qingdao Novia Polymer Co., Ltd.			China
River Rock S.A.			Costa Rica
S.C. Premdor Ukraine			Ukraine
Sacopan Inc.			Canada
SIA Paroc			Latvia
Sierra Lumber, Inc.			United States
Soltech, Inc.			United States
Steelwood LLC			United States
Tecnoforest Del Norte S.A.			Costa Rica
Thermafiber, Inc			United States
Transandina de Comercio S.A.			Chile
UAB Paroc			Lithuania
Vliepa GmbH			Germany