X0306 4 2017-11-20 0 0001370946 Owens Corning OC 0001228309 THAMAN MICHAEL H ONE OWENS CORNING PARKWAY TOLEDO OH 43659 1 1 0 0 Chairman, President and CEO $.01 Par Value Common 2017-11-20 4 M 0 100600 33.96 A 840370.254 D $.01 Par Value Common 2017-11-20 4 S 0 82900 85.17 D 757470.254 D $.01 Par Value Common 2017-11-20 4 S 0 17700 85.95 D 739770.254 D $.01 Par Value Common 2017-11-21 4 M 0 1000 33.96 A 740770.254 D $.01 Par Value Common 2017-11-21 4 S 0 1000 87.17 D 739770.254 D Option (right to purchase) 33.96 2017-11-20 4 M 0 100600 0.00 D 2015-02-02 2021-02-02 $.01 Par Value Common 100600 1000 D Option (right to purchase) 33.96 2017-11-21 4 M 0 1000 0.00 D 2015-02-02 2021-02-02 $.01 Par Value Common 1000 0 D The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $84.56 - $85.56, inclusive. The Reporting Person undertakes to provide to Owens Corning, any security holder of Owens Corning, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $85.61 - $86.25, inclusive. The Reporting Person undertakes to provide to Owens Corning, any security holder of Owens Corning, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $87.02 - $87.45, inclusive. The Reporting Person undertakes to provide to Owens Corning, any security holder of Owens Corning, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ Omar N. Chaudhary, Attorney-in-Fact 2017-11-21