EXHIBIT 11 ROBERTSON-CECO CORPORATION COMPUTATION OF BASIC EARNINGS PER COMMON SHARE (In thousands, except per share data) (Unaudited) Three Months Ended Six Months Ended June 30 June 30 1998 1997 1998 1997 BASIC: Income: Income from continuing operations . . . . . . $ 6,519 $ 4,335 $ 10,027 $ 7,495 Extraordinary gain . . . . . . . . . . . . . . . - - - 4,568 Total income for basic earnings per share calculation . . . . . . . . . . . . . . $ 6,519 $ 4,335 $ 10,027 $ 12,063 Shares: Average number of common shares outstanding . . . . . . . . . . . . . . . 16,060 16,056 16,060 16,056 Earnings Per Share: Income from continuing operations . . . . . . . . $ .41 $ .27 $ .62 $ .47 Extraordinary gain . . . . . . . . . . . . . . . - - - .28 Net income per share . . . . . . . . . . . . . . $ .41 $ .27 $ .62 $ .75 EXHIBIT 11 ROBERTSON-CECO CORPORATION COMPUTATION OF DILUTED EARNINGS PER COMMON SHARE (In thousands, except per share data) (Unaudited) Three Months Ended Six Months Ended June 30 June 30 1998 1997 1998 1997 DILUTED: Income: Income from continuing operations . . . . . . $ 6,519 $ 4,335 $ 10,027 $ 7,495 Extraordinary gain . . . . . . . . . . . . . . . - - - 4,568 Net income for diluted earnings per share calculation . . . . . . . . . . . . . . $ 6,519 $ 4,335 $ 10,027 $ 12,063 Shares: Average number of common shares outstanding . . . . . . . . . . . . . . 16,060 16,056 16,060 16,056 Incremental shares to reflect dilutive effect of deferred compensation plan . . . . . 37 31 37 31 Total number of common shares assuming dilution . . . . . . . . . . . . . . 16,097 16,087 16,097 16,087 Earnings Per Share: Income from continuing operations . . . . . . . $ .41 $ .27 $ .62 $ .47 Extraordinary gain . . . . . . . . . . . . . . - - - .28 Net income per share . . . . . . . . . . . . . . $ .41 $ .27 $ .62 $ .75