EXHIBIT 11 ROBERTSON-CECO CORPORATION COMPUTATION OF BASIC EARNINGS PER COMMON SHARE (In thousands, except per share data) (Unaudited) Three Months Ended March 31 1998 1997 BASIC: Income: Income from continuing operations . . . . . . . . . . $ 3,508 $ 3,160 Extraordinary gain . . . . . . . . . . . . . . . . . - 4,568 Total income for basic earnings per share calculation . . . . . . . . . . . . . . . $ 3,508 $ 7,728 Shares: Average number of common shares outstanding . . . . . . . . . . . . . . . . 16,060 16,056 Earnings Per Share: Income from continuing operations . . . . . . . . . . $ .22 $ .20 Extraordinary gain . . . . . . . . . . . . . . . . . - .28 Net income per share . . . . . . . . . . . . . . . . $ .22 $ .48 EXHIBIT 11 ROBERTSON-CECO CORPORATION COMPUTATION OF DILUTED EARNINGS PER COMMON SHARE (In thousands, except per share data) (Unaudited) Three Months Ended March 31 1998 1997 DILUTED: Income: Income from continuing operations . . . . . . . . . . $ 3,508 $ 3,160 Extraordinary gain . . . . . . . . . . . . . . . . . . - 4,568 Total income for diluted earnings per share calculation . . . . . . . . . . . . . . . . $ 3,508 $ 7,728 Shares: Average number of common shares outstanding . . . . . . . . . . . . . . . . 16,060 16,056 Incremental shares to reflect dilutive effect of deferred compensation plan . . . . . . . . 36 30 Total number of common shares assuming dilution . . . . . . . . . . . . . . . . . 16,096 16,086 Earnings Per Share: Income from continuing operations . . . . . . . . . . $ .22 $ .20 Extraordinary gain . . . . . . . . . . . . . . . . . . - .28 Net income per share . . . . . . . . . . . . . . . . . $ .22 $ .48