Exhibit (11) OWENS CORNING AND SUBSIDIARIES COMPUTATION OF PER SHARE EARNINGS Quarter Ended March 31, 1999 1998 (In millions of dollars, except share data) Basic: Net income $ 44 $ 8 Basic weighted average number of common shares outstanding (thousands) 53,932 53,373 Basic per share amount $ .81 $ .16 Diluted: Net income $ 46 $ 8 Weighted average number of shares outstanding (thousands) 53,932 53,373 Weighted average common equivalent shares (thousands): Deferred awards 563 352 Stock options using the higher of average market price or market price at end of period 205 120 Shares from assumed conversion of preferred securities 4,566 - Diluted weighted average number of common shares outstanding and common equivalent shares (thousands) 59,266 53,845 Diluted per share amount $ .77 $ .16