Exhibit (11) OWENS CORNING AND SUBSIDIARIES COMPUTATION OF PER SHARE EARNINGS FOR THE YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996 Basic: 1998 1997 1996 (In millions of dollars, except share data) Net income (loss) $ (705) $ 47 $ (284) Basic weighted average number of common shares outstanding (thousands) 53,579 52,860 51,349 Basic per share amount $ (13.16) $ .89 $ (5.54) Diluted: Net income (loss) $ (705) $ 47 $ (284) Weighted average number of shares outstanding (thousands) 53,579 52,860 51,349 Weighted average common equivalent shares (thousands): Deferred awards - 352 - Stock options using the average market price during the period - 334 - Shares from assumed conversion of preferred securities - - - Diluted weighted average number of common shares outstanding and common equivalent shares (thousands) 53,579 53,546 51,349 Diluted per share amount $ (13.16) $ .88 $ (5.54)