Owens Corning (OC) 10-K 2019 FY Annual report

Exhibit 32.1

SECTION 1350 CERTIFICATION

In connection with the Annual Report on Form 10-K of Owens Corning (the “Company”) for the fiscal year ended December 31, 2019 (the “Report”), I, Brian D. Chambers, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)Information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/  Brian D. Chambers  

Brian D. Chambers

Chief Executive Officer

(Principal Executive Officer)

February 19, 2020