HECKES HOWARD C sold DOOR

Footnotes

Pursuant to the Arrangement Agreement, at the Effective Time, each award of Masonite restricted stock units (whether time- or performance-based) held by the Reporting Person was converted into an award of Owens Corning time-based restricted stock units with respect to Owens Corning common stock (OC Award) of equivalent value and with the same terms and conditions as applied to such stock units immediately prior to the Effective Time.; (contd from footnote 3) The number of shares of Owens Corning common stock subject to each such OC Award equals the number of Shares subject to the corresponding Masonite restricted stock units immediately prior to the Effective Time multiplied by an exchange ratio of 0.76424, which equals the quotient obtained by dividing (i) the Arrangement Consideration by (ii) the volume-weighted average closing price per share of Owens Corning common stock on the New York Stock Exchange for the ten consecutive trading day period ending on the date that is two trading days prior to the Effective Time, provided that, in the case of any Masonite restricted stock unit subject to performance periods that were incomplete as of the Effective Time, such performance goals were deemed satisfied at 122% of the target level (or deemed achieved in full if such award does not have a target performance construct) at the Effective Time.