X0202 4 2006-05-15 1 0000716783 LAFARGE NORTH AMERICA INC LAF 0001174913 COHEN MARSHALL A 1 CHESTNUT PARK ROAD TORONTO A6 M4W 1W4 ONTARIO, CANADA 1 0 0 0 Common Stock 2006-05-15 4 S 0 3935 85.50 D 0 D Common Stock 2006-05-15 4 S 0 1000 85.50 D 0 I Adroit Investments Ltd Nonemployee Director Stock Option (Right to Buy) 21.375 2006-05-16 4 D 0 1000 85.50 D 2007-02-06 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 33.1188 2006-05-16 4 D 0 1000 85.50 D 2008-02-10 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 23.00 2006-05-16 4 D 0 1000 85.50 D 2010-02-07 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 29.97 2006-05-16 4 D 0 1000 85.50 D 2011-02-12 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 41.05 2006-05-16 4 D 0 1000 85.50 D 2012-02-04 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 29.81 2006-05-16 4 D 0 1000 85.50 D 2013-02-03 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 41.86 2006-05-16 4 D 0 1000 85.50 D 2014-02-04 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 54.50 2006-05-16 4 D 0 1000 85.50 D 2015-02-03 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 64.00 2006-05-16 4 D 0 1000 85.50 D 2016-01-31 Common Stock 1000 0 D Nonemployee Director Stock Option (Right to Buy) 38.125 2006-05-16 4 D 0 1000 85.50 D 2009-02-08 Common Stock 1000 0 D Phantom Stock 2006-05-16 4 D 0 5569 85.50 D Common Stock 5569 0 D This option, which vested according to length of service of the Nonemployee Director, was canceled in the merger of Efalar Inc. and Lafarge North America Inc. in exchange for a cash payment of $85.50 per share. These shares are payable on a 1 for 1 basis. The shares of phantom stock were payable in cash or common stock, at the election of the reporting person, upon the reporting person's termination of service as a director. As a result of the merger between Eflar Inc. and Lafarge North America Inc. these shares were converted to a cash value of $85.50 per share and will continue to accrue interest until paid out in January 2007. William G. Miller, signed pursuant to Authorization previously filed 2006-05-16