##### 



UNITED STATES SECURITIES AND EXCHANGE COMMISSION
 WASHINGTON, D.C. 20549
 FORM 10-K/A
 (Amendment
No. 1)
 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
 For the fiscal year ended
December 31, 2005
    
    Commission File Number 0-11936
 
 Lafarge North America Inc.
 Incorporated in Maryland
    
    I.R.S. Employer Identification No.12950 Worldgate Dr., Suite 500
    
    58-1290226Herndon, Virginia 20170(703) 480-3600
  Title of Each Class
    
    Name of Each Exchange on Which RegisteredCommon Stock, par value $1.00 per share
    
    New York Stock Exchange, IncThe Toronto Stock Exchange
    o þ
  o þ
 þ o
 o
  Large accelerated filer þ
    
    Accelerated filer o
    
    Non-accelerated filer o
 o þ




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##### 



EXPLANATORY NOTE
  2




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##### 



PART III
 Item 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE COMPANY
 Directors
          3




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##### 



Executive Officers
   4




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##### 



5




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##### 



Director Compensation
 Base Compensation.
     6




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##### 



Options.
  Audit Committee
  Section 16(a) Beneficial Ownership Reporting Compliance
  Code of Ethics
 www.lafargenorthamerica.com
 7




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##### 



Item 11. EXECUTIVE COMPENSATION
  Report on Executive Compensation
    Base Salary
    8




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##### 



.
 Annual Incentives.
    Long-Term Incentives.
   9




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##### 



Management Development and
Compensation Committee
 
 10




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##### 



Summary Compensation Table
  Long-Term Compensation# OfSecuritiesAnnual Compensation
    
    
    
    
    
    UnderlyingName and
    
    
    
    
    
    
    
    
    
    
    
    
    
    Other Annual
    
    Stock
    
    Restricted
    
    LTIP
    
    All OtherPrincipal Position
    
    Year
    
    Salary
    
    Bonus
    
    Compensation(1)
    
    Options
    
    Stock(2)
    
    Payouts(3)
    
    Compensation(4)Philippe R. Rollier(5)
    
    
    2005
    
    
    $
    640,000
    
    
    $
    442,880
    
    
    $
    42,816
    (6)
    
    
    60,000
    
    
    
    2,500
    
    
    $
    88,000
    
    
    $
    206,006President and Chief
    
    
    2004
    
    
    
    550,000
    
    
    
    486,250
    
    
    
    44,510
    
    
    
    60,000
    
    
    
    
    
    
    
    90,338
    
    
    
    58,470Executive Officer
    
    
    2003
    
    
    
    510,000
    
    
    
    340,043
    
    
    
    120,081
    
    
    
    40,000
    
    
    
    
    
    
    
    
    
    
    
    57,938Dominique Calabrese
    
    
    2005
    
    
    
    389,000
    
    
    
    198,857
    
    
    
    13,888
    (7)
    
    
    30,000
    
    
    
    1,000
    
    
    
    26,659
    
    
    
    11,674Executive Vice President and
    
    
    2004
    
    
    
    363,000
    
    
    
    233,990
    
    
    
    20,922
    
    
    
    30,000
    
    
    
    
    
    
    
    36,881
    
    
    
    8,784President Eastern
    
    
    2003
    
    
    
    329,000
    
    
    
    166,803
    
    
    
    139,552
    
    
    
    20,000
    
    
    
    
    
    
    
    
    
    
    
    26,164Aggregates, Concrete
& AsphaltThomas G. Farrell
    
    
    2005
    
    
    
    407,000
    
    
    
    224,338
    
    
    
    
    
    
    
    30,000
    
    
    
    1,000
    
    
    
    27,893
    
    
    
    10,809Executive Vice President
    
    
    2004
    
    
    
    360,833
    
    
    
    245,902
    
    
    
    
    
    
    
    30,000
    
    
    
    
    
    
    
    37,592
    
    
    
    205,211and President Western
    
    
    2003
    
    
    
    313,000
    
    
    
    155,561
    
    
    
    
    
    
    
    20,000
    
    
    
    
    
    
    
    
    
    
    
    25,822Aggregates, Concrete
& AsphaltJean-Marc Lechêne
    
    
    2005
    
    
    
    426,000
    
    
    
    199,368
    
    
    
    163,539
    (8)
    
    
    30,000
    
    
    
    1,000
    
    
    
    34,364
    
    
    
    13,044Executive Vice President
    
    
    2004
    
    
    
    311,000
    
    
    
    277,527
    
    
    
    197,480
    
    
    
    30,000
    
    
    
    
    
    
    
    35,143and President  Cement
    
    
    2003
    
    
    
    302,000
    
    
    
    148,101
    
    
    
    142,925
    
    
    
    20,000
    
    
    
    
    
    
    
    
    
    
    
    5,993Eric C. Olsen
    
    
    2005
    
    
    
    392,000
    
    
    
    209,171
    
    
    
    101,979
    (9)
    
    
    30,000
    
    
    
    1,000
    
    
    
    16,987
    
    
    
    11,818Executive Vice President
and Chief Financial
Officer
 
 (1)
    
    Excludes perquisites and other benefits, unless the aggregate amount of such benefits
exceeded the lesser of $50,000 or 10 percent of the total annual salary and bonus reported for
the named executive officer.(2)
    
    Shares of restricted stock awarded on February 4, 2005 under our 2002 Stock Incentive Plan do
not vest and may not be transferred until five years after the grant date.(3)
    
    Considering our financial results in 2004 and 2005 and assuming performance at the maximum
level in 2006, the following are the maximum awards that could be awarded to the named
officers for 2006 under the long term incentive portion of our incentive plan: Philippe R. Rollier
    
    $
    264,448Dominique Calabrese
    
    
    128,565Thomas G. Farrell
    
    
    134,514Jean-Marc Lechêne
    
    
    140,793Eric Olsen
    
    
    129,556
 
 (4)
    
    The amounts shown for 2005 include (a) $9,450 in contributions or allocations by us to each
of Mr. Rolliers, Mr. Farrells and Mr. Olsens accounts under our Thrift Savings Plan and
Thrift Savings Restoration Plan; (b) term life insurance premiums paid by us ($1,359 for Mr.
Farrell and $286 for Mr. Olsen); (c) interest that would have been payable by the executive on
his interest free loan if we required interest to be paid ($63,914 for Mr. Rollier and $11,674
for Mr. Calabrese); (d) relocation expenses paid by us ($2,100 for Mr. Lechêne and $2,082 for
Mr. Olsen); (e) contributions to pension plans in France made by Lafarge S.A. ($5,994 for Mr.
Rollier and $10,944 for Mr. Lechêne) and (f) $126,648 in interest earned (at prime) on
compensation deferred by Mr. Rollier. 11




---



##### 



(5)
    
    Mr. Rollier did not receive any additional compensation by virtue of his position as an
Executive Vice President of Lafarge S.A.(6)
    
    Includes $13,326 in U.S. residential real property tax and $29,490 reimbursed during the year
for the payment of certain taxes.(7)
    
    Includes $13,888 reimbursed during the year for the payment of certain taxes.(8)
    
    Includes $12,607 for the use of a company car, $9,132 in country club dues, $58,446
reimbursed during the year for the payment of certain taxes and $30,483 for certain other
expatriate expenses.(9)
    
    Reimbursements during the year for the payment of certain taxes. Option Exercises and Year-End Values
  Number of Securities
    
    Value of UnexercisedShares
    
    
    
    
    
    Underlying Unexercised
    
    In-The-Money OptionsAcquired
    
    Value
    
    Options at December 31, 2005
    
    at December 31, 2005(2)Name
    
    on Exercise
    
    Realized (1)
    
    Exercisable
    
    Unexercisable
    
    Exercisable
    
    UnexercisablePhilippe R. Rollier
    
    
    69,000
    
    
    $
    1,948,170
    (3)
    
    
    35,000
    
    
    
    135,000
    
    
    $
    701,600
    
    
    $
    1,237,300Dominique Calabrese
    
    
    -0-
    
    
    
    -0-
    
    
    
    53,750
    
    
    
    66,250
    
    
    
    979,713
    
    
    
    619,188Thomas G. Farrell
    
    
    5,000
    
    
    
    140,200
    (4)
    
    
    18,750
    
    
    
    66,250
    
    
    
    255,863
    
    
    
    619,188Jean-Marc Lechêne
    
    
    -0-
    
    
    
    -0-
    
    
    
    47,800
    
    
    
    67,500
    
    
    
    943,615
    
    
    
    636,650Eric C. Olsen
    
    
    8,000
    
    
    
    319,120
    
    
    
    20,875
    
    
    
    57,250
    
    
    
    303,434
    
    
    
    486,698
 
 (1)
    
    Market value on exercise date minus option exercise price times number of options exercised.(2)
    
    Market value at year end ($55.02) of one share of our common stock minus option exercise
price times number of options.(3)
    
    Mr. Rollier did not sell 18,324 of the shares he acquired upon exercise of his options.(4)
    
    Mr. Farrell did not sell 273 of the shares he acquired upon exercise of his options. Option Grants
  Numberof Securities
    
    Option Grants in Last Fiscal YearUnderlying
    
    Percentage ofOptions
    
    Total Options
    
    
    
    
    
    
    
    
    
    Grant DateGranted (1)
    
    Granted to Employees
    
    Exercise
    
    Expiration
    
    Present Value (2)Name
    
    (#)
    
    in 2005
    
    Price ($/sh)
    
    Date
    
    ($)Philippe R. Rollier
    
    
    60,000
    
    
    
    5.20
    %
    
    $
    54.50
    
    
    
    2/03/15
    
    
    $
    880,200Dominique Calabrese
    
    
    30,000
    
    
    
    2.60
    %
    
    
    54.50
    
    
    
    2/03/15
    
    
    
    440,100Thomas G. Farrell
    
    
    30,000
    
    
    
    2.60
    %
    
    
    54.50
    
    
    
    2/03/15
    
    
    
    440,100Jean-Marc Lechêne
    
    
    30,000
    
    
    
    2.60
    %
    
    
    54.50
    
    
    
    2/03/15
    
    
    
    440,100Eric C. Olsen
    
    
    30,000
    
    
    
    2.60
    %
    
    
    54.50
    
    
    
    2/03/15
    
    
    
    440,100
 
 (1)
    
    All options expire ten years after the grant date and vest in annual 25% increments beginning
one year after the grant date. 12




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##### 



(2)
    
    In accordance with Securities and Exchange Commission rules, we have used the
Black-Scholes option pricing model to estimate the grant date present value of the options
set forth in this table. Our use of this model should not be construed as an endorsement
of its accuracy at valuing options. All stock option valuation models, including the
Black-Scholes model, require a prediction about the future movement of the stock price.
The real value of the options in this table depends upon actual changes in the market price
of our common stock during the applicable period. Performance Graph
  Comparison of Five Year Cumulative Total Return (1)  Among Lafarge North America Inc., Russell 3000 and Peer Group
 
 2000
    
    2001
    
    2002
    
    2003
    
    2004
    
    2005Lafarge North America Inc.
    
    $
    100.00
    
    
    $
    161.92
    
    
    $
    144.00
    
    
    $
    181.48
    
    
    $
    234.28
    
    
    $
    252.15Russell 3000
    
    
    100.00
    
    
    
    88.54
    
    
    
    69.47
    
    
    
    91.04
    
    
    
    101.92
    
    
    
    108.16Peer Group(2)
    
    
    100.00
    
    
    
    107.65
    
    
    
    85.02
    
    
    
    125.54
    
    
    
    172.76
    
    
    
    223.61
 
 (1)
    
    Assumes $100 invested on December 31, 2000 in our common stock, Russell 3000 Index and Peer
Group Index. Total return assumes reinvestment of dividends.(2)
    
    Includes Texas Industries, Inc., Vulcan Materials Company, Eagle Materials Inc. and Martin
Marietta Materials, Inc. 13




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##### 



U.S. Retirement Plans
     U.S. Pension Plan Table
 Five-YearAverage
    
    Annual PensionAnnual
    
    Covered Years of Service at Age 65Earnings
    
    15 years
    
    20 years
    
    25 years
    
    30 years
    
    35 years$

50,000
    
   $
    13,125
    
    
   $
    17,500
    
    
   $
    21,875
    
    
   $
    26,250
    
    
   $
    30,625100,000
    
    
    26,250
    
    
    
    35,000
    
    
    
    43,750
    
    
    
    52,500
    
    
    
    61,250150,000
    
    
    39,375
    
    
    
    52,500
    
    
    
    65,625
    
    
    
    78,750
    
    
    
    91,875200,000
    
    
    52,500
    
    
    
    70,000
    
    
    
    87,500
    
    
    
    105,000
    
    
    
    122,500250,000
    
    
    65,625
    
    
    
    87,500
    
    
    
    109,375
    
    
    
    131,250
    
    
    
    153,125300,000
    
    
    78,750
    
    
    
    105,000
    
    
    
    131,250
    
    
    
    157,500
    
    
    
    183,750350,000
    
    
    91,875
    
    
    
    122,500
    
    
    
    153,125
    
    
    
    183,750
    
    
    
    214,375400,000
    
    
    105,000
    
    
    
    140,000
    
    
    
    175,000
    
    
    
    210,000
    
    
    
    245,000450,000
    
    
    118,125
    
    
    
    157,500
    
    
    
    196,875
    
    
    
    236,250
    
    
    
    275,625500,000
    
    
    131,250
    
    
    
    175,000
    
    
    
    218,750
    
    
    
    262,500
    
    
    
    306,250550,000
    
    
    144,375
    
    
    
    192,500
    
    
    
    240,625
    
    
    
    288,750
    
    
    
    336,875600,000
    
    
    157,500
    
    
    
    210,000
    
    
    
    262,500
    
    
    
    315,000
    
    
    
    367,500
  14




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Canadian Retirement Plans
      15




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##### 



Canadian Pension Plan Table
 Five-YearAverage
    
    Annual PensionPensionable
    
    Covered Years of Service at Age 65Earnings
    
    15 years
    
    20 years
    
    25 years
    
    30 years
    
    35 years$   50,000
    
$
    15,000
    
    
$
    20,000
    
    
$
    25,000
    
    
$
    30,000
    
    
$
    35,000100,000
    
    
    30,000
    
    
    
    40,000
    
    
    
    50,000
    
    
    
    60,000
    
    
    
    70,000150,000
    
    
    45,000
    
    
    
    60,000
    
    
    
    75,000
    
    
    
    90,000
    
    
    
    105,000200,000
    
    
    60,000
    
    
    
    80,000
    
    
    
    100,000
    
    
    
    120,000
    
    
    
    140,000250,000
    
    
    75,000
    
    
    
    100,000
    
    
    
    125,000
    
    
    
    150,000
    
    
    
    175,000300,000
    
    
    90,000
    
    
    
    120,000
    
    
    
    150,000
    
    
    
    180,000
    
    
    
    210,000350,000
    
    
    105,000
    
    
    
    140,000
    
    
    
    175,000
    
    
    
    210,000
    
    
    
    245,000400,000
    
    
    120,000
    
    
    
    160,000
    
    
    
    200,000
    
    
    
    240,000
    
    
    
    280,000450,000
    
    
    135,000
    
    
    
    180,000
    
    
    
    225,000
    
    
    
    270,000
    
    
    
    315,000500,000
    
    
    150,000
    
    
    
    200,000
    
    
    
    250,000
    
    
    
    300,000
    
    
    
    350,000550,000
    
    
    165,000
    
    
    
    220,000
    
    
    
    275,000
    
    
    
    330,000
    
    
    
    385,000600,000
    
    
    180,000
    
    
    
    240,000
    
    
    
    300,000
    
    
    
    360,000
    
    
    
    420,000650,000
    
    
    195,000
    
    
    
    260,000
    
    
    
    325,000
    
    
    
    390,000
    
    
    
    455,000700,000
    
    
    210,000
    
    
    
    280,000
    
    
    
    350,000
    
    
    
    420,000
    
    
    
    490,000
 Note:
    
    All amounts shown in the above table are in Canadian dollars and assume that the executive
makes optional contributions (2% of pay, as described above)   Compensation Committee Interlocks and Insider Participation
  16




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##### 



Item 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER
MATTERS
 Principal Holders of our Common Stock
  Amount and Natureof Beneficial
    
    PercentName and Address of Beneficial Owner
    
    Ownership
    
    of Class (1)Lafarge S.A.
    
    
    40,093,581
    (2)
    
    
    53.2
    %61, rue des Belles Feuilles75116 Paris FranceFMR Corp.
    
    
    5,514,830
    (3)
    
    
    7.3
    %82 Devonshire StreetBoston, Massachusetts 02109
 
 (1)
    
    Calculated based on the number of shares of common stock plus the number of exchangeable
preference shares outstanding. Holders of exchangeable preference shares (other than the
company and Lafarge Canada Inc.) have voting rights through a trust holding shares of our
voting stock.(2)
    
    Includes 39,605,061 shares of common stock and 488,520 exchangeable preferences shares of our
subsidiary, Lafarge Canada Inc., held by Lafarge S.A. either directly or through its
beneficial interests in Lafarge (U.S.) Holdings and Paris-Zurich Holdings (both New York
trusts) and Cementia Holdings A.G., a Swiss corporation and majority-owned subsidiary of
Lafarge S.A.(3)
    
    Based solely on Schedule 13G/A dated February 14, 2006 filed by FMR Corp. with the U.S.
Securities and Exchange Commission. The Schedule 13G/A reports beneficial ownership by FMR
Corp. of 5,514,830 shares of common stock, with sole power to dispose or direct the
disposition of all such shares and sole power to vote (or direct the vote of) none of such
shares. The Schedule 13G/A also reports that the interest of Fidelity Low Priced Stock Fund,
an investment company registered under the Investment Company Act of 1940, in the shares of
common stock beneficially owned by FMR Corp. amounted to 5,500,000 shares.
  17




---



##### 



Stock Ownership of Directors and Executive Officers
  Beneficial Ownership of Lafarge S.A.Beneficial Ownership of the Companys Common Stock(1)
    
    Common StockNumber of
    
    Number of
    
    
    
    
    
    % of
    
    Phantom
    
    Number of
    
    Number of
    
    
    
    
    
    % ofName
    
    Shares
    
    Options
    
    Total
    
    Class
    
    Stock(2)
    
    Shares
    
    Options
    
    Total
    
    ClassMarshall A. Cohen
    
    
    4,935
    (3)
    
    
    10,000
    
    
    
    14,935
    
    
    
    *
    
    
    
    5,569
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-Bertrand P. Collomb
    
    
    10,699
    
    
    
    143,500
    
    
    
    154,199
    
    
    
    *
    
    
    
    -0-
    
    
    
    62,485
    
    
    
    266,072
    
    
    
    328,557
    
    
    
    *Philippe P. Dauman
    
    
    -0-
    
    
    
    2,000
    
    
    
    2,000
    
    
    
    *
    
    
    
    4,703
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-Bernard L. Kasriel
    
    
    4,000
    
    
    
    86,000
    
    
    
    90,000
    
    
    
    *
    
    
    
    -0-
    
    
    
    18,124
    
    
    
    129,622
    
    
    
    147,746
    
    
    
    *Bruno Lafont
    
    
    1,000
    
    
    
    2,500
    
    
    
    3,500
    
    
    
    *
    
    
    
    -0-
    
    
    
    5,117
    
    
    
    40,494
    
    
    
    45,611
    
    
    
    *Claudine B. Malone
    
    
    5,250
    
    
    
    6,000
    
    
    
    11,250
    
    
    
    *
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-Blythe J. McGarvie
    
    
    850
    
    
    
    1,750
    
    
    
    2,600
    
    
    
    *
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-James M. Micali
    
    
    720
    
    
    
    1,750
    
    
    
    2,470
    
    
    
    *
    
    
    
    3,534
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-Robert W. Murdoch
    
    
    2,100
    
    
    
    10,000
    
    
    
    12,100
    
    
    
    *
    
    
    
    586
    
    
    
    1,704
    
    
    
    -0-
    
    
    
    1,704
    
    
    
    *Bertin F. Nadeau
    
    
    5,150
    (4)
    
    
    3,000
    
    
    
    8,150
    
    
    
    *
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-John D. Redfern
    
    
    9,462
    
    
    
    9,000
    
    
    
    18,462
    
    
    
    *
    
    
    
    -0-
    
    
    
    559
    
    
    
    -0-
    
    
    
    559
    
    
    
    *Philippe R. Rollier
    
    
    27,377
    
    
    
    85,000
    
    
    
    112,377
    
    
    
    *
    
    
    
    -0-
    
    
    
    8,126
    
    
    
    28,504
    
    
    
    36,630
    
    
    
    *Michel Rose
    
    
    -0-
    
    
    
    2,000
    
    
    
    2,000
    
    
    
    *
    
    
    
    -0-
    
    
    
    350
    
    
    
    60,961
    
    
    
    61,311
    
    
    
    *Lawrence M. Tanenbaum
    
    
    -0-
    
    
    
    4,411,000
    (5)
    
    
    4,411,000
    
    
    
    5.5
    %
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-Gerald H. Taylor
    
    
    6,000
    
    
    
    1,000
    
    
    
    7,000
    
    
    
    *
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-Dominique Calabrese
    
    
    3,902
    
    
    
    77,500
    
    
    
    81,402
    
    
    
    *
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    15,000
    
    
    
    15,000
    
    
    
    *Thomas G. Farrell
    
    
    4,547
    
    
    
    42,500
    
    
    
    47,047
    
    
    
    *
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-Jean-Marc Lechêne
    
    
    3,508
    
    
    
    72,800
    
    
    
    76,308
    
    
    
    *
    
    
    
    -0-
    
    
    
    3,202
    
    
    
    -0-
    
    
    
    3,202
    
    
    
    *Eric C. Olsen
    
    
    4,643
    
    
    
    42,250
    
    
    
    46,893
    
    
    
    *
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-
    
    
    
    -0-All directors and
executive officers
(24 persons)
    
    
    101,212
    
    
    
    5,132,925
    
    
    
    5,234,137
    
    
    
    *
    
    
    
    14,392
    
    
    
    99,667
    
    
    
    540,653
    
    
    
    640,320
    
    
    
    *
 
 (1)
    
    The shares below include exchangeable preference shares of our subsidiary, Lafarge
Canada (which are exchangeable at the option of the holder into our common stock on a
one for one basis) and common stock covered by stock options that were exercisable on
January 31, 2006 or within 60 days thereafter. Holders of exchangeable preference shares
have voting rights through a trust holding shares of our voting stock and are entitled
to direct the voting of one share of voting stock for each exchangeable preference share
held.(2)
    
    Directors may elect to invest fees they receive for service as directors in phantom
shares of our common stock. Holders of phantom shares are entitled only to receive
cash and have no right to acquire our common stock on which the value of the phantom
shares is based.(3)
    
    Includes 1,000 shares owned by Adroit Investments Ltd., which is controlled by Mr. Cohen.(4)
    
    Includes 4,000 shares owned by Casavant Freres and 1,134 shares owned by GescoLynx Inc.,
both of which are controlled by Mr. Nadeau.(5)
    
    Includes the right to acquire 4.4 million shares of our common stock for $29.00 per
share pursuant to a warrant held by an affiliate of Kilmer Van Nostrand Co. Limited,
which is controlled by Mr. Tanenbaum. 18




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##### 



Equity Compensation Plan Information
  Number ofsecurities to beissued upon
    
    Weighted-average
    
    Number of securities remainingexercise of
    
    exercise price of
    
    available for future issuanceoutstanding
    
    outstanding
    
    under equity compensation plansoptions, warrants
    
    options, warrants
    
    (excluding securities reflectedand rights
    
    and rights
    
    in column (a))Plan Category
    
    (a)
    
    (b)
    
    (c)Equity compensation
plans approved by
security holders
    
    
    4,102,732
    
    
    $
    41.26
    
    
    
    9,238,968
    (1)Equity compensation
plans not approved
by security holders
    
    
    - 0 -
    
    
    
    - 0 -
    
    
    
    -0-Total
    
    
    4,102,732
    
    
    $
    41.26
    
    
    
    9,238,968
 
 (1)
    
    Includes 2,238,968 shares remaining available for issuance under our Employee Stock Purchase
Plan. 19




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##### 



Item 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 Indebtedness of Management
  Transactions with Management and Others
      20




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##### 



21




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##### 



Item 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES
 Fees Paid To Independent Registered Public Accounting Firm
  2005
    
    
    2004Audit Fees:$
    2,814,000
    
    
    $
    3,067,000Audit Related Fees:Audits of benefit plans
    
    $
    411,000
    
    
    $
    359,000Pre-implementation ERP review
    
    
    360,000Consultation related to financial accounting
    
    
    27,000
    
    
    
    79,000$
    798,000
    
    
    $
    438,000Tax Fees:Tax consultation and planning
    
    $
    20,000
    
    
    $
    57,000State and local tax consulting
    
    
    -0-
    
    
    
    -0-Due diligence
    
    
    -0-
    
    
    
    -0-$
    20,000
    
    
    $
    57,000All Other Fees
    
    
    -0-
    
    
    
    -0-
  22




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##### 



PART IV
 Item 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 ExhibitNumber
    
    Description of Exhibits*31.1
    
    Certification of Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.*31.2
    
    Certification of Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.
 
 *
    
    Filed herewith 23




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##### 



SIGNATURES
  LAFARGE NORTH AMERICA INC.By:
    
    /s/ Eric C. Olsen

Eric C. OlsenExecutive Vice President andChief Financial Officer
   Signature
    
    Title
    
    Date/s/ Philippe R. Rollier
    
    President, Chief Executive Officer
and Director
    
    April 28, 2006Philippe R. Rollier/s/ Eric C. Olsen
    
    Executive Vice President and Chief Financial Officer
    
    April 28, 2006Eric C. Olsen/s/ James W. Bachmann
    
    Senior Vice President and Controller
    
    April 28, 2006James W. Bachmann/s/ Bertrand P. Collomb
    
    Chairman of the Board
    
    April 28, 2006Bertrand P. Collomb/s/ Bruno Lafont
    
    Vice Chairman of the Board
    
    April 28, 2006Bruno Lafont/s/ Marshall A. Cohen
    
    Director
    
    April 28, 2006Marshall A. Cohen/s/ Philippe P. Dauman
    
    Director
    
    April 28, 2006Philippe P. Dauman
 24




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##### 



Signature
    
    Title
    
    Date/s/ Bernard L. Kasriel
    
    Director
    
    April 28, 2006Bernard L. Kasriel/s/ Claudine B. Malone
    
    Director
    
    April 28, 2006Claudine B. Malone/s/ Blythe J. McGarvie
    
    Director
    
    April 28, 2006Blythe J. McGarvie/s/ James M. Micali
    
    Director
    
    April 28, 2006James M. Micali/s/ Robert W. Murdoch
    
    Director
    
    April 28, 2006Robert W. Murdoch/s/ Bertin F. Nadeau
    
    Director
    
    April 28, 2006Bertin F. Nadeau/s/ John D. Redfern
    
    Director
    
    April 28, 2006John D. Redfern/s/ Michel Rose
    
    Director
    
    April 28, 2006Michel Rose/s/ Lawrence M. Tanenbaum
    
    Director
    
    April 28, 2006Lawrence M. Tanenbaum/s/ Gerald H. Taylor
    
    Director
    
    April 28, 2006Gerald H. Taylor
 25