Document:

<PAGE>   1
                                                                     EXHIBIT 4.2

                      AMENDED AND RESTATED CREDIT AGREEMENT

                            DATED AS OF JUNE 30, 2001

                          TO BE EFFECTIVE JULY 20, 2001

                                      AMONG

                       CENTEX CONSTRUCTION PRODUCTS, INC.,
                                  AS BORROWER,

                                  THE LENDERS,

                                  BANK ONE, NA,
                             AS ADMINISTRATIVE AGENT
                                 AND LC ISSUER,

                             BANK OF AMERICA, N.A.,
                              AS SYNDICATION AGENT,

                         PNC BANK, NATIONAL ASSOCIATION,
                             AS DOCUMENTATION AGENT,

                                       AND

                         BANC ONE CAPITAL MARKETS, INC.,
                     AS LEAD ARRANGER AND SOLE BOOK MANAGER

<PAGE>   2

                                TABLE OF CONTENTS

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ARTICLE I         DEFINITIONS.....................................................................................1

ARTICLE II        THE CREDITS....................................................................................16
         2.1.     Commitment.....................................................................................16
         2.2.     Required Payments; Termination.................................................................16
         2.3.     Ratable Loans..................................................................................16
         2.4.     Types of Advances..............................................................................16
         2.5.     Commitment Fee; Reductions in Aggregate Commitment.............................................16
         2.6.     Minimum Amount of Each Advance.................................................................17
         2.7.     Optional Principal Payments....................................................................17
         2.8.     Method of Selecting Types and Interest Periods for New Advances................................17
         2.9.     Conversion and Continuation of Outstanding Advances............................................18
         2.10.    Changes in Interest Rate, etc..................................................................18
         2.11.    Rates Applicable After Default.................................................................19
         2.12.    Method of Payment..............................................................................19
         2.13.    Noteless Agreement; Evidence of Indebtedness...................................................19
         2.14.    Telephonic Notices.............................................................................20
         2.15.    Interest Payment Dates; Interest and Fee Basis.................................................20
         2.16.    Notification of Advances, Interest Rates, Prepayments and Commitment Reductions................21
         2.17.    Lending Installations..........................................................................21
         2.18.    Non-Receipt of Funds by the Administrative Agent...............................................21
         2.19.    Facility LCs...................................................................................21
                 2.19.1    Issuance..............................................................................21
                 2.19.2    Participations........................................................................22
                 2.19.3    Notice................................................................................22
                 2.19.4    LC Fees...............................................................................22
                 2.19.5    Administration; Reimbursement by Lenders..............................................23
                 2.19.6    Reimbursement by Borrower.............................................................23
                 2.19.7    Obligations Absolute..................................................................24
                 2.19.8    Actions of LC Issuer..................................................................24
                 2.19.9    Indemnification.......................................................................25
                 2.19.10   Lenders' Indemnification..............................................................25
                 2.19.11   Facility LC Collateral Account........................................................25
                 2.19.12   Rights as a Lender....................................................................26
         2.20.    Replacement of Lender..........................................................................26
         2.21.    Swing Line Subfacility.........................................................................26
                 2.21.1    Conditions............................................................................26
                 2.21.2    Lenders' Funding of Swing Line Advances as Advances Under Revolving Credit
                           Facility..............................................................................27
         2.22.    [Intentionally Deleted.].......................................................................28
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         2.23.    Prepayments from Sale of Assets................................................................28
         2.24.    [Intentionally Deleted.].......................................................................28
         2.25.    Prepayments from Sales of Capital Stock........................................................28

ARTICLE III       YIELD PROTECTION; TAXES........................................................................29
         3.1.     Yield Protection...............................................................................29
         3.2.     Changes in Capital Adequacy Regulations........................................................29
         3.3.     Availability of Types of Advances..............................................................30
         3.4.     Funding Indemnification........................................................................30
         3.5.     Taxes..........................................................................................30
         3.6.     Lender Statements; Survival of Indemnity.......................................................32

ARTICLE IV        CONDITIONS PRECEDENT...........................................................................33
         4.1.     Initial Advance................................................................................33
         4.2.     Each Credit Extension..........................................................................34

ARTICLE V         REPRESENTATIONS AND WARRANTIES.................................................................35
         5.1.     Existence and Standing.........................................................................35
         5.2.     Authorization and Validity.....................................................................35
         5.3.     No Conflict; Government Consent................................................................35
         5.4.     Financial Statements...........................................................................36
         5.5.     Material Adverse Change........................................................................36
         5.6.     Taxes..........................................................................................36
         5.7.     Litigation and Contingent Obligations..........................................................36
         5.8.     Subsidiaries...................................................................................36
         5.9.     ERISA..........................................................................................36
         5.10.    Accuracy of Information........................................................................37
         5.11.    Regulation U...................................................................................37
         5.12.    Material Agreements............................................................................37
         5.13.    Compliance With Laws...........................................................................37
         5.14.    Ownership of Properties........................................................................37
         5.15.    Plan Assets; Prohibited Transactions...........................................................37
         5.16.    Environmental Matters..........................................................................37
         5.17.    Investment Company Act.........................................................................38
         5.18.    Public Utility Holding Company Act.............................................................38
         5.19.    Subordinated Indebtedness......................................................................38
         5.20.    Post-Retirement Benefits.......................................................................38
         5.21.    Solvency.......................................................................................38
         5.22.    Indenture......................................................................................39

ARTICLE VI        COVENANTS......................................................................................39
         6.1.     Financial Reporting............................................................................39
         6.2.     Use of Proceeds................................................................................40
         6.3.     Notice of Default..............................................................................40
         6.4.     Conduct of Business............................................................................40
         6.5.     Taxes..........................................................................................41
         6.6.     Insurance......................................................................................41
</Table>

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         6.7.     Compliance with Laws...........................................................................41
         6.8.     Maintenance of Properties......................................................................41
         6.9.     Inspection.....................................................................................41
         6.10.    Dividends......................................................................................41
         6.11.    Indebtedness...................................................................................42
         6.12.    Merger.........................................................................................42
         6.13.    Sale of Assets.................................................................................42
         6.14.    Investments and Acquisitions...................................................................43
         6.15.    Liens..........................................................................................43
         6.16.    Capital Expenditures...........................................................................44
         6.17.    Affiliates.....................................................................................44
         6.18.    Sale and Leaseback Transactions and other Off-Balance Sheet Liabilities........................44
         6.19.    Contingent Obligations.........................................................................44
         6.20.    Letters of Credit..............................................................................45
         6.21.    Financial Contracts............................................................................45
         6.22.    Financial Covenants............................................................................45
                 6.22.1    Interest Coverage Ratio...............................................................45
                 6.22.2    Leverage Ratio........................................................................45
                 6.22.3    Minimum Tangible Net Worth............................................................45
         6.23.    Lines of Business..............................................................................45
         6.24.    Prepayment of Debt.............................................................................45
         6.25.    Future Subsidiaries............................................................................46
         6.26.    Prohibition on Granting Negative Pledges.......................................................46
         6.27.    Prohibition on Granting Restrictions on Distributions..........................................46
         6.28.    Prohibition on Synthetic Leases................................................................46
         6.29.    Amendments to Indebtedness.....................................................................46
         6.30.    [Intentionally Deleted.].......................................................................46
         6.31.    Target Senior Subordinated Notes...............................................................46

ARTICLE VII       DEFAULTS.......................................................................................47

ARTICLE VIII      ACCELERATION, WAIVERS, AMENDMENTS AND REMEDIES.................................................49
         8.1.     Acceleration; Facility LC Collateral Account...................................................49
         8.2.     Amendments.....................................................................................50
         8.3.     Preservation of Rights.........................................................................51

ARTICLE IX        GENERAL PROVISIONS.............................................................................51
         9.1.     Survival of Representations....................................................................51
         9.2.     Governmental Regulation........................................................................51
         9.3.     Headings.......................................................................................52
         9.4.     ENTIRE AGREEMENT...............................................................................52
         9.5.     Several Obligations; Benefits of this Agreement................................................52
         9.6.     Expenses; Indemnification......................................................................52
         9.7.     Numbers of Documents...........................................................................53
         9.8.     Accounting.....................................................................................53
         9.9.     Severability of Provisions.....................................................................53
         9.10.    Nonliability of Lenders........................................................................53
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         9.11.    Confidentiality................................................................................54
         9.12.    Nonreliance....................................................................................54
         9.13.    Disclosure.....................................................................................54
         9.14.    Maximum Interest Rate..........................................................................54
         9.15.    Non-Application of Chapter 346 of Texas Finance Code...........................................55
         9.16.    Survival of Prior Agreements...................................................................55

ARTICLE X         THE ADMINISTRATIVE AGENT.......................................................................55
         10.1.    Appointment; Nature of Relationship............................................................55
         10.2.    Powers.........................................................................................55
         10.3.    General Immunity...............................................................................56
         10.4.    No Responsibility for Credit Extensions, Recitals, etc.........................................56
         10.5.    Action on Instructions of Lenders..............................................................56
         10.6.    Employment of Administrative Agents and Counsel................................................56
         10.7.    Reliance on Documents; Counsel.................................................................57
         10.8.    Administrative Agent's Reimbursement and Indemnification.......................................57
         10.9.    Notice of Default..............................................................................57
         10.10.   Rights as a Lender.............................................................................57
         10.11.   Lender Credit Decision.........................................................................58
         10.12.   Successor Administrative Agent.................................................................58
         10.13.   Administrative Agent and Arranger Fees.........................................................59
         10.14.   Delegation to Affiliates.......................................................................59
         10.15.   Co-Agents, Documentation Agent, Syndication Agent, etc.........................................59

ARTICLE XI        SETOFF; RATABLE PAYMENTS.......................................................................59
         11.1.    Setoff.........................................................................................59
         11.2.    Ratable Payments...............................................................................59

ARTICLE XII       BENEFIT OF AGREEMENT; ASSIGNMENTS; PARTICIPATIONS..............................................60
         12.1.    Successors and Assigns.........................................................................60
         12.2.    Participations.................................................................................60
                 12.2.1    Permitted Participants; Effect........................................................60
                 12.2.2    Voting Rights.........................................................................60
                 12.2.3    Benefit of Setoff.....................................................................61
         12.3.    Assignments....................................................................................61
                 12.3.1    Permitted Assignments.................................................................61
                 12.3.2    Effect; Effective Date................................................................61
         12.4.    Dissemination of Information...................................................................62
         12.5.    Tax Treatment..................................................................................62

ARTICLE XIII      NOTICES........................................................................................62
         13.1.    Notices........................................................................................62
         13.2.    Change of Address..............................................................................63
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ARTICLE XIV       COUNTERPARTS...................................................................................63

ARTICLE XV        CHOICE OF LAW; CONSENT TO JURISDICTION; WAIVER OF JURY TRIAL...................................63
         15.1.    CHOICE OF LAW..................................................................................63
         15.2.    CONSENT TO JURISDICTION........................................................................63
         15.3.    WAIVER OF JURY TRIAL...........................................................................64
         15.4.    Effect of Amendment and Restatement............................................................64
</Table>

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EXHIBITS:

A - PRICING SCHEDULE

B - COMPLIANCE CERTIFICATE

C - ASSIGNMENT AGREEMENT

D - LOAN/CREDIT RELATED MONEY TRANSFER INSTRUCTION

E - NOTE

SCHEDULES:

1 - SUBSIDIARIES AND OTHER INVESTMENTS

2 - INDEBTEDNESS AND LIENS

3 - EXISTING FACILITY LCS

4

                                      -vi-
<PAGE>   8

                      AMENDED AND RESTATED CREDIT AGREEMENT

         This Amended and Restated Credit Agreement (this "Agreement") is
entered into as of June 30, 2001 to be effective as of July 20, 2001, by and
among the banks listed on the signature pages hereof (the "Lenders"), CENTEX
CONSTRUCTION PRODUCTS, INC., a Delaware corporation ("Borrower"), and BANK OF
AMERICA, N.A., a national banking association, as Syndication Agent, PNC BANK,
NATIONAL ASSOCIATION, a national banking association, as Documentation Agent,
BANK ONE, NA, as LC Issuer and Administrative Agent.

                                    RECITALS

         A. The Lenders, the Borrower, Republic Holding Corporation, a Nevada
corporation, the Syndication Agent, the Documentation Agent, the LC Issuer and
the Administrative Agent are parties to that certain Credit Agreement dated as
of November 10, 2000, as amended by a certain First Amendment to Credit
Agreement dated as of December 20, 2000 (as amended, the "Existing Credit
Agreement").

         B. The Borrower desires to amend and restate the Existing Credit
Agreement to amend certain covenants, and the Administrative Agent and Required
Lenders have agreed to such amendment, subject to the terms and conditions
contained herein.

         NOW, THEREFORE, in consideration of the covenants, conditions and
agreements hereafter set forth, and for other good and valuable consideration,
the receipt and adequacy of which are all hereby acknowledged, the parties
hereto covenant and agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

         As used in this Agreement:

         "Acquisition" means any transaction, or any series of related
transactions, consummated on or after the date of this Agreement, by which the
Borrower or any of its Subsidiaries (i) acquires any going business or all or
substantially all of the assets of any firm, corporation or limited liability
company, or division thereof, whether through purchase of assets, merger or
otherwise or (ii) directly or indirectly acquires (in one transaction or as the
most recent transaction in a series of transactions) at least a majority (in
number of votes) of the securities of a corporation which have ordinary voting
power for the election of directors (other than securities having such power
only by reason of the happening of a contingency) or a majority (by percentage
or voting power) of the outstanding ownership interests of a partnership or
limited liability company.

         "Advance" means (a) a borrowing hereunder, (i) made by the Lenders on
the same Borrowing Date, or (ii) converted or continued by the Lenders on the
same date of conversion or continuation, consisting, in either case, of the
aggregate amount of the several Loans of the same Type and, in the case of
Eurodollar Loans, for the same Interest Period, (b) a Swing Line Advance, and
(c) a payment under a Facility LC.

<PAGE>   9

         "Administrative Agent" means Bank One in its capacity as contractual
representative of the Lenders pursuant to Article X, and not in its individual
capacity as a Lender, and any successor Administrative Agent appointed pursuant
to Article X.

         "Affiliate" of any Person means any other Person directly or indirectly
controlling, controlled by or under common control with such Person. A Person
shall be deemed to control another Person if the controlling Person owns 10% or
more of any class of voting securities (or other ownership interests) of the
controlled Person or possesses, directly or indirectly, the power to direct or
cause the direction of the management or policies of the controlled Person,
whether through ownership of stock, by contract or otherwise.

         "Agents" means, collectively, the Administrative Agent, the Syndication
Agent and the Documentation Agent.

         "Aggregate Commitment" means the aggregate of the Commitments of all
the Lenders, as reduced from time to time pursuant to the terms hereof.

         "Aggregate Outstanding Credit Exposure" means, at any time, the
aggregate of the Outstanding Credit Exposure of all the Lenders.

         "Agreement" means this credit agreement, as it may be amended, restated
or modified and in effect from time to time.

         "Agreement Accounting Principles" means generally accepted accounting
principles as in effect from time to time, applied in a manner consistent with
that used in preparing the financial statements referred to in Section 5.4.

         "Alternate Base Rate" means, for any day, a rate of interest per annum
equal to the higher of (i) the Prime Rate for such day and (ii) the sum of the
Federal Funds Effective Rate for such day plus 1/2% per annum.

         "Applicable Fee Rate" means, at any time, the percentage rate per annum
at which Commitment Fees are accruing on the unused portion of the Aggregate
Commitment at such time as set forth in the Pricing Schedule.

         "Applicable Margin" means, with respect to Advances of any Type at any
time, the percentage rate per annum which is applicable at such time with
respect to Advances of such Type as set forth in the Pricing Schedule.

         "Arranger" means Banc One Capital Markets, Inc., a Delaware
corporation, and its successors, in its capacity as Lead Arranger and Sole Book
Manager.

         "Article" means an article of this Agreement unless another document is
specifically referenced.

         "Authorized Officer" means any of the President, Chief Executive
Officer, Executive Vice President, Chief Financial Officer, Senior Vice
President or Assistant Treasurer of the Borrower, acting singly.

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         "Available Aggregate Commitment" means, at any time, the Aggregate
Commitment then in effect minus the Aggregate Outstanding Credit Exposure at
such time.

         "Bank One" means Bank One, NA, a national banking association having
its principal office in Dallas, Texas, in its individual capacity, and its
successors.

         "Borrower" means Centex Construction Products, Inc., a Delaware
corporation, and its successors and assigns.

         "Borrowing Date" means a date on which an Advance is made hereunder.

         "Borrowing Notice" is defined in Section 2.8.

         "Business Day" means (i) with respect to any borrowing, payment or rate
selection of Eurodollar Advances, a day (other than a Saturday or Sunday) on
which banks generally are open in Dallas and New York for the conduct of
substantially all of their commercial lending activities, interbank wire
transfers can be made on the Fedwire system and dealings in United States
dollars are carried on in the London interbank market and (ii) for all other
purposes, a day (other than a Saturday or Sunday) on which banks generally are
open in Dallas for the conduct of substantially all of their commercial lending
activities and interbank wire transfers can be made on the Fedwire system.

         "Capital Expenditures" means, without duplication, any expenditures for
any purchase or other acquisition of any asset which would be classified as a
fixed or capital asset on a consolidated balance sheet of the Borrower and its
Subsidiaries prepared in accordance with Agreement Accounting Principles
excluding (i) the cost of assets acquired with Capitalized Lease Obligations,
(ii) expenditures of insurance proceeds to rebuild or replace any asset after a
casualty loss, (iii) leasehold improvement expenditures for which the Borrower
or a Subsidiary is reimbursed promptly by the lessor, and (iv) any Permitted
Acquisition.

         "Capitalized Lease" of a Person means any lease of Property by such
Person as lessee which would be capitalized on a balance sheet of such Person
prepared in accordance with Agreement Accounting Principles.

         "Capitalized Lease Obligations" of a Person means the amount of the
obligations of such Person under Capitalized Leases which would be shown as a
liability on a balance sheet of such Person prepared in accordance with
Agreement Accounting Principles.

         "Cash Equivalent Investments" means (i) short-term obligations of, or
fully guaranteed by, the United States of America, (ii) commercial paper rated
A-2 or better by S&P or P-2 or better by Moody's, (iii) demand deposit accounts
maintained in the ordinary course of business, and (iv) certificates of deposit
issued by and time deposits with commercial banks (whether domestic or foreign)
having capital and surplus in excess of $100,000,000; provided in each case that
the same provides for payment of both principal and interest (and not principal
alone or interest alone) and is not subject to any contingency regarding the
payment of principal or interest.

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         "Change in Control" means (i) the acquisition by any Person, or two or
more Persons acting in concert, of beneficial ownership (within the meaning of
Rule 13d-3 of the Securities and Exchange Commission under the Securities
Exchange Act of 1934) of 50% or more of the outstanding shares of voting stock
of the Borrower; or (ii) Centex Corporation shall cease to own, free and clear
of all Liens or other encumbrances, greater than 50% of the outstanding shares
of voting stock of the Borrower on a fully diluted basis.

         "Code" means the Internal Revenue Code of 1986, as amended, reformed or
otherwise modified from time to time.

         "Collateral Shortfall Amount" is defined in Section 8.1.

         "Commitment" means, for each Lender, the obligation of such Lender to
make Loans to, and participate in Facility LCs issued upon the application of,
the Borrower in an aggregate amount not exceeding the amount set forth opposite
its signature below or as set forth in any Notice of Assignment relating to any
assignment that has become effective pursuant to Section 12.3.2, as such amount
may be modified from time to time pursuant to terms hereof.

         "Consolidated Capital Expenditures" means, with reference to any
period, the Capital Expenditures of the Borrower and its Subsidiaries calculated
on a consolidated basis for such period.

         "Consolidated EBIT" means Consolidated EBITDA minus depreciation and
amortization, all calculated for the Borrower and its Subsidiaries on a
consolidated basis.

         "Consolidated EBITDA" means Consolidated Net Income plus, to the extent
deducted from revenues in determining Consolidated Net Income, (i) Consolidated
Interest Expense, (ii) expense for taxes paid or accrued, (iii) depreciation,
(iv) amortization and (v) extraordinary losses incurred other than in the
ordinary course of business, minus, to the extent included in Consolidated Net
Income, extraordinary gains realized other than in the ordinary course of
business, all calculated for the Borrower and its Subsidiaries on a consolidated
basis. Notwithstanding anything herein to the contrary, but without duplication,
Consolidated EBITDA shall be inclusive of either (a) in the case of an
Acquisition of equity interests in a Person, the EBITDA (calculated on a basis
consistent with this definition of Consolidated EBITDA) of such Person before it
became a Subsidiary of the Borrower or (b) in the case of an Acquisition of
assets, or any other acquisition of assets if the Administrative Agent so
agrees, the EBITDA associated with such acquired assets before such acquisition
by the Borrower or any Subsidiary but exclusive of either (1) in the case of a
disposition of equity interests in a Person, the EBITDA (calculated on the basis
consistent with this definition of Consolidated EBITDA) of such Person after it
is directly or indirectly disposed of by the Borrower or (2) in the case of a
disposition of assets, the EBITDA associated with such assets after such assets
are disposed of by the Borrower or any Subsidiary, all of which amounts shall be
based upon audited financial statements.

         "Consolidated Funded Indebtedness" means at any time the aggregate
dollar amount of Consolidated Indebtedness which has actually been funded and is
outstanding at such time, whether or not such amount is due or payable at such
time.

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<PAGE>   12

         "Consolidated Indebtedness" means at any time the Indebtedness of the
Borrower and its Subsidiaries calculated on a consolidated basis as of such
time.

         "Consolidated Interest Expense" means, with reference to any period,
the interest expense and preferred stock dividends of the Borrower and its
Subsidiaries calculated on a consolidated basis for such period.

         "Consolidated Net Income" means, with reference to any period, the net
income (or loss) of the Borrower and its Subsidiaries calculated on a
consolidated basis for such period.

         "Consolidated Net Worth" means at any time the consolidated
stockholders' equity of the Borrower and its Subsidiaries calculated on a
consolidated basis as of such time.

         "Consolidated Tangible Net Worth" means at any time the Consolidated
Net Worth, minus (a) any intangible assets, including, without limitation,
patents, patent rights, trademarks, trade names, franchises, copyrights,
goodwill, and other similar intangible assets of the Borrower and its
Subsidiaries calculated on a consolidated basis as of such time, minus (b) any
non-cash gain (or plus any non-cash loss, as applicable) resulting from any
mark-to-market adjustments made directly to Consolidated Net Worth as a result
of fluctuations in the value of financial instruments owned by the Borrower or
any of its Subsidiaries as mandated under FAS 133.

         "Contingent Obligation" of a Person means any agreement, undertaking or
arrangement by which such Person assumes, guarantees, endorses, contingently
agrees to purchase or provide funds for the payment of, or otherwise becomes or
is contingently liable upon, the obligation or liability of any other Person, or
agrees to maintain the net worth or working capital or other financial condition
of any other Person, or otherwise assures any creditor of such other Person
against loss, including, without limitation, any comfort letter, operating
agreement, take-or-pay contract or the obligations of any such Person as general
partner of a partnership with respect to the liabilities of the partnership.

         "Conversion/Continuation Notice" is defined in Section 2.9.

         "Controlled Group" means all members of a controlled group of
corporations or other business entities and all trades or businesses (whether or
not incorporated) under common control which, together with the Borrower or any
of its Subsidiaries, are treated as a single employer under Section 414 of the
Code.

         "Credit Extension" means the making of an Advance or the issuance of a
Facility LC hereunder.

         "Credit Extension Date" means the Borrowing Date for an Advance or the
issuance date of a Facility LC.

         "Default" means an event described in Article VII.

         "Documentation Agent" means PNC Bank, National Association in its
capacity as documentation agent, and not in its individual capacity as a Lender.

                                      -5-
<PAGE>   13

         "Environmental Laws" means any and all federal, state, local and
foreign statutes, laws, judicial decisions, regulations, ordinances, rules,
judgments, orders, decrees, plans, injunctions, permits, concessions, grants,
franchises, licenses, agreements and other governmental restrictions relating to
(i) the protection of the environment, (ii) the effect of the environment on
human health, (iii) emissions, discharges or releases of pollutants,
contaminants, hazardous substances or wastes into surface water, ground water or
land, or (iv) the manufacture, processing, distribution, use, treatment,
storage, disposal, transport or handling of pollutants, contaminants, hazardous
substances or wastes or the clean-up or other remediation thereof.

         "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time, and any rule or regulation issued thereunder.

         "Eurodollar Advance" means an Advance which, except as otherwise
provided in Section 2.11, bears interest at the applicable Eurodollar Rate.

         "Eurodollar Base Rate" means, with respect to a Eurodollar Advance for
the relevant Interest Period, the applicable British Bankers' Association
Interest Settlement Rate for deposits in U.S. dollars appearing on Reuters
Screen FRBD as of 11:00 a.m. (London time) two Business Days prior to the first
day of such Interest Period, and having a maturity equal to such Interest
Period, provided that, (i) if Reuters Screen FRBD is not available to the
Administrative Agent for any reason, the applicable Eurodollar Base Rate for the
relevant Interest Period shall instead be the applicable British Bankers'
Association Interest Settlement Rate for deposits in U.S. dollars as reported by
any other generally recognized financial information service as of 11:00 a.m.
(London time) two Business Days prior to the first day of such Interest Period,
and having a maturity equal to such Interest Period, and (ii) if no such British
Bankers' Association Interest Settlement Rate is available to the Administrative
Agent, the applicable Eurodollar Base Rate for the relevant Interest Period
shall instead be the rate determined by the Administrative Agent to be the rate
at which Bank One or one of its Affiliate banks offers to place deposits in U.S.
dollars with first-class banks in the London interbank market at approximately
11:00 a.m. (London time) two Business Days prior to the first day of such
Interest Period, in the approximate amount of Bank One's relevant Eurodollar
Loan and having a maturity equal to such Interest Period.

         "Eurodollar Loan" means a Loan which, except as otherwise provided in
Section 2.11, bears interest at the applicable Eurodollar Rate.

         "Eurodollar Rate" means, with respect to a Eurodollar Advance for the
relevant Interest Period, the sum of (i) the quotient of (a) the Eurodollar Base
Rate applicable to such Interest Period, divided by (b) one minus the Reserve
Requirement (expressed as a decimal) applicable to such Interest Period, plus
(ii) the Applicable Margin.

         "Excluded Taxes" means, in the case of each Lender or applicable
Lending Installation and the Administrative Agent, taxes imposed on its overall
net income, and franchise taxes imposed on it, by (i) the jurisdiction under the
laws of which such Lender or the Administrative Agent is incorporated or
organized or (ii) the jurisdiction in which the Administrative Agent's or such
Lender's principal executive office or such Lender's applicable Lending
Installation is located.

                                      -6-
<PAGE>   14

         "Exhibit" refers to an exhibit to this Agreement, unless another
document is specifically referenced.

         "Existing Eurodollar Borrowing" is defined in Section 15.4.

         "Existing Facility LCs" is defined in Section 2.19.1.

         "Facility LC" is defined in Section 2.19.1.

         "Facility LC Application" is defined in Section 2.19.3.

         "Facility LC Collateral Account" is defined in Section 2.19.11.

         "Facility Termination Date" means November 10, 2003, or any earlier
date on which the Aggregate Commitment is reduced to zero or otherwise
terminated pursuant to the terms hereof.

         "Federal Funds Effective Rate" means, for any day, an interest rate per
annum equal to the weighted average of the rates on overnight Federal funds
transactions with members of the Federal Reserve System arranged by Federal
funds brokers on such day, as published for such day (or, if such day is not a
Business Day, for the immediately preceding Business Day) by the Federal Reserve
Bank of New York, or, if such rate is not so published for any day which is a
Business Day, the average of the quotations at approximately 10:00 a.m. (Dallas
time) on such day on such transactions received by the Administrative Agent from
three Federal funds brokers of recognized standing selected by the
Administrative Agent in its sole discretion.

         "Financial Contract" of a Person means (i) any exchange-traded or
over-the-counter futures, forward, swap or option contract or other financial
instrument with similar characteristics, or (ii) any Rate Management
Transaction.

         "Floating Rate" means, for any day, a rate per annum equal to (i) the
Alternate Base Rate for such day plus (ii) the Applicable Margin, in each case
changing when and as the Alternate Base Rate changes.

         "Floating Rate Advance" means an Advance which, except as otherwise
provided in Section 2.11, bears interest at the Floating Rate.

         "Floating Rate Loan" means a Loan which, except as otherwise provided
in Section 2.11, bears interest at the Floating Rate.

         "Guarantors" means collectively, all of the Significant Subsidiaries of
the Borrower and their respective successors and assigns.

         "Guaranty" means that certain Amended and Restated Guaranty dated as of
the date hereof executed by the Guarantors in favor of the Administrative Agent,
for the ratable benefit of the Lenders, as it may be amended, restated,
supplemented or modified and in effect from time to time.

                                      -7-
<PAGE>   15

         "Indebtedness" of a Person means, without duplication, such Person's
(i) obligations for borrowed money, (ii) obligations representing the deferred
purchase price of Property or services (other than accounts payable arising in
the ordinary course of such Person's business payable on terms customary in the
trade), (iii) obligations, whether or not assumed, secured by Liens on or
payable out of the proceeds or production from Property now or hereafter owned
or acquired by such Person, (iv) obligations which are evidenced by notes,
acceptances, or other instruments, (v) obligations to purchase securities or
other Property arising out of or in connection with the sale of the same or
substantially similar securities or Property, (vi) Capitalized Lease
Obligations, (vii) Net Mark-to-Market Exposure under Rate Management
Transactions and other Financial Contracts, (viii) Contingent Obligations, (ix)
Letters of Credit, (x) Sale and Leaseback Transactions, (xi) Off-Balance Sheet
Liabilities, and (xii) any other obligation for borrowed money or other
financial accommodation which in accordance with Agreement Accounting Principles
would be shown as a liability on the consolidated balance sheet of such Person.

         "Indenture" means that certain Indenture governing the Target Senior
Subordinated Notes.

         "Interest Period" means, with respect to a Eurodollar Advance, a period
of one, two, three or six months commencing on a Business Day selected by the
Borrower pursuant to this Agreement. Such Interest Period shall end on the day
which corresponds numerically to such date one, two, three or six months
thereafter, provided, however, that if there is no such numerically
corresponding day in such next, second, third or sixth succeeding month, such
Interest Period shall end on the last Business Day of such next, second, third
or sixth succeeding month. If an Interest Period would otherwise end on a day
which is not a Business Day, such Interest Period shall end on the next
succeeding Business Day, provided, however, that if said next succeeding
Business Day falls in a new calendar month, such Interest Period shall end on
the immediately preceding Business Day.

         "Investment" of a Person means any loan, advance (other than
commission, travel and similar advances to officers and employees made in the
ordinary course of business), extension of credit (other than accounts
receivable arising in the ordinary course of business on terms customary in the
trade) or contribution of capital by such Person; stocks, bonds, mutual funds,
partnership interests, notes, debentures or other securities owned by such
Person; any deposit accounts and certificate of deposit owned by such Person;
and structured notes, derivative financial instruments and other similar
instruments or contracts owned by such Person.

         "LC Fee" is defined in Section 2.19.4.

         "LC Issuer" means Bank One, NA (or any subsidiary or Affiliate of Bank
One, NA designated by Bank One, NA) in its capacity as issuer of Facility LCs
hereunder.

         "LC Obligations" means, at any time, the sum, without duplication, of
(i) the aggregate undrawn stated amount under all Facility LCs outstanding at
such time plus (ii) the aggregate unpaid amount at such time of all
Reimbursement Obligations.

         "LC Payment Date" is defined in Section 2.19.5.

                                      -8-
<PAGE>   16

         "Lenders" means the lending institutions listed on the signature pages
of this Agreement and their respective successors and assigns.

         "Lending Installation" means, with respect to a Lender or the
Administrative Agent, the office, branch, subsidiary or Affiliate of such Lender
or the Administrative Agent listed on the signature pages hereof or on a
Schedule or otherwise selected by such Lender or the Administrative Agent
pursuant to Section 2.17.

         "Letter of Credit" of a Person means a letter of credit or similar
instrument which is issued upon the application of such Person or upon which
such Person is an account party or for which such Person is in any way liable.

         "Leverage Ratio" means, as of any date of calculation, the ratio of (i)
Consolidated Funded Indebtedness outstanding on such date to (ii) Consolidated
EBITDA for the Borrower's then most-recently ended four fiscal quarters.

         "Lien" means any lien (statutory or other), mortgage, pledge,
hypothecation, assignment, deposit arrangement, encumbrance or preference, or
priority or other security agreement (including, without limitation, the
interest of a vendor or lessor under any conditional sale, Capitalized Lease or
other title retention agreement).

         "Loan" means, with respect to a Lender, such Lender's loan made
pursuant to Article II (or any conversion or continuation thereof).

         "Loan Documents" means this Agreement, the Facility LC Applications,
any Notes issued pursuant to Section 2.13, the Guaranty and any other related
documents, instruments and agreements now or hereafter executed by Borrower or
any Guarantor in connection with any of the foregoing.

         "Material Adverse Effect" means a material adverse effect on (i) the
business, Property, financial condition, or results of operations of the
Borrower and its Subsidiaries taken as a whole, (ii) the ability of the Borrower
to perform its obligations under the Loan Documents to which it is a party, or
(iii) the validity or enforceability of any of the Loan Documents or the rights
or remedies of the Administrative Agent, the LC Issuer or the Lenders
thereunder.

         "Material Indebtedness" is defined in Section 7.5.

         "Maximum Rate" means, at any time and with respect to any Lender, the
maximum rate of interest under applicable law that such Lender may charge the
Borrower. The Maximum Rate shall be calculated in a manner that takes into
account any and all fees, payments, and other charges in respect of the Loan
Documents that constitute interest under applicable law. Each change in any
interest rate provided for herein based upon the Maximum Rate resulting from a
change in the Maximum Rate shall take effect without notice to the Borrower at
the time of such change in the Maximum Rate. For purposes of determining the
Maximum Rate under Texas law, the applicable rate ceiling shall be the weekly
rate ceiling described in, and computed in accordance with, Chapter 303 of the
Texas Finance Code, as amended from time to time.

         "Modify" and "Modification" are defined in Section 2.19.1.

                                      -9-
<PAGE>   17

         "Moody's" means Moody's Investors Service, Inc.

         "Multiemployer Plan" means a Plan maintained pursuant to a collective
bargaining agreement or any other arrangement to which the Borrower or any
member of the Controlled Group is a party to which more than one employer is
obligated to make contributions.

         "Net Mark-to-Market Exposure" of a Person means, as of any date of
determination, the excess (if any) of all unrealized losses over all unrealized
profits of such Person arising from Rate Management Transactions. "Unrealized
losses" means the fair market value of the cost to such Person of replacing such
Rate Management Transaction as of the date of determination (assuming the Rate
Management Transaction were to be terminated as of that date), and "unrealized
profits" means the fair market value of the gain to such Person of replacing
such Rate Management Transaction as of the date of determination (assuming such
Rate Management Transaction were to be terminated as of that date).

         "Net Cash Proceeds" means, with respect to any sale, lease, transfer or
disposition of any asset of any Person or issuance of any Indebtedness or equity
of any Person, the aggregate amount of cash received by such Person in
connection with such transaction minus reasonable fees, costs and expenses,
related taxes paid or payable, and repayment of any Indebtedness secured by
assets sold, leased, transferred or disposed of which is required to be repaid
as a result of such transaction.

         "Non-U.S. Lender" is defined in Section 3.5(iv).

         "Note" is defined in Section 2.13.

         "Obligations" means all unpaid principal of and accrued and unpaid
interest on the Loans, all Reimbursement Obligations, all accrued and unpaid
fees and all expenses, reimbursements, indemnities and other obligations of the
Borrower to the Lenders or to any Lender or any of their Affiliates, the
Administrative Agent, the LC Issuer or any indemnified party arising under the
Loan Documents.

         "Off-Balance Sheet Liability" of a Person means (i) any repurchase
obligation or liability of such Person with respect to accounts or notes
receivable sold by such Person, (ii) any liability under any Sale and Leaseback
Transaction which is not a Capitalized Lease, (iii) any liability under any
Synthetic Lease entered into by such Person, (iv) any obligation or liability
arising with respect to any sale or transfer of an interest in trade receivables
of the Borrower or any Subsidiary on a limited recourse basis, or (v) any
obligation arising with respect to any other transaction which is the functional
equivalent of or takes the place of borrowing but which does not constitute a
liability on the balance sheets of such Person, but excluding from this clause
(v) Operating Leases.

         "Operating Lease" of a Person means any lease of Property (other than a
Capitalized Lease) by such Person as lessee which has an original term
(including any required renewals and any renewals effective at the option of the
lessor) of one year or more.

         "Operating Lease Obligations" means, as at any date of determination,
the amount obtained by aggregating the present values, determined in the case of
each particular Operating

                                      -10-
<PAGE>   18

Lease by applying a discount rate (which discount rate shall equal the discount
rate which would be applied under Agreement Accounting Principles if such
Operating Lease were a Capitalized Lease) from the date on which each fixed
lease payment is due under such Operating Lease to such date of determination,
of all fixed lease payments due under all Operating Leases of the Borrower and
its Subsidiaries.

         "Other Taxes" is defined in Section 3.5(ii).

         "Outstanding Credit Exposure" means, as to any Lender at any time, the
sum of (i) the aggregate principal amount of its Loans outstanding at such time,
plus (ii) an amount equal to its Pro Rata Share of the LC Obligations at such
time, plus (iii) an amount equal to its Pro Rata Share of the Swing Line
Advances at such time.

         "Participants" is defined in Section 12.2.1.

         "Payment Date" means the first day of each calendar quarter.

         "PBGC" means the Pension Benefit Guaranty Corporation, or any successor
thereto.

         "Permitted Acquisition" means any Acquisition by Borrower or any
Subsidiary which meets the following criteria:

                  (i) the acquisition target is in the construction products or
         building materials industry, and if assets are being acquired, the
         assets are located in the continental United States of America;

                  (ii) the Borrower has completed not less than customary due
         diligence on the acquisition target and provided evidence thereof to
         the Administrative Agent, including without limitation as to compliance
         with all Environmental Laws;

                  (iii) if the proposed Acquisition is of stock or other
         ownership interests, the Acquisition will be structured so that the
         acquisition target becomes a Subsidiary of the Borrower and complies
         with Section 6.25 of this Agreement, if applicable;

                  (iv) the interests being acquired shall not be subject to any
         contingent liabilities, unsatisfied judgments, or any pending or
         threatened action, charge, claim, demand, suit, proceeding, or
         governmental investigation that could reasonably be expected to have a
         Material Adverse Effect;

                  (v) if the total purchase price (as determined in accordance
         with clause (vi) below) to be paid in connection with the proposed
         Acquisition is greater than $15,000,000, the Borrower shall have
         provided to the Administrative Agent and each Lender (a) copies of the
         audited financial statements of the acquisition target for the most
         recent twelve (12) month period prior to the closing of the Acquisition
         and interim financial statements of the acquisition target, each
         containing at a minimum a balance sheet, statement of income, and a
         statement of cash flow, and (b) a pro forma financial projection of the
         Borrower for the twelve (12) month period following the date of the
         consummation of the proposed Acquisition which reflects pro forma
         compliance with the

                                      -11-
<PAGE>   19

         financial covenants contained in Section 6.22 and a certificate of an
         Authorized Officer of the Borrower confirming such calculations both
         before and after giving effect to the Acquisition;

                  (vi) the total purchase price (including cash consideration
         paid however classified, assumed indebtedness, noncompete payments and
         consulting payments whether such amounts are paid at closing or over
         time, and the dollar value of all assets to be transferred by the
         purchaser to the seller in connection with such Acquisition) to be paid
         to acquire the equity interests or assets in any single such
         Acquisition does not exceed an amount equal to fifteen percent (15%) of
         the Consolidated Tangible Net Worth as of the date of such Acquisition
         (which calculation for purposes herein shall not include the tangible
         net worth of the Person being acquired) unless the prior written
         consent of Required Lenders has otherwise been obtained;

                  (vii) when no Default exists or will result therefrom, an
         acquisition other than the Permitted Acquisitions described in clauses
         (v) or (vi) above, subject to compliance with clauses (i), (ii), (iii),
         (iv), and (viii) hereof, for which the total purchase price (as
         determined in accordance with clause (vi) above) given does not exceed
         $15,000,000;

                  (viii) the total aggregate purchase price (as determined in
         accordance with clause (vi) above) paid in connection with all
         Permitted Acquisitions shall not exceed $150,000,000 in the aggregate
         unless the prior written consent of Required Lenders has otherwise been
         obtained; and

                  (ix) the name of the acquisition target and a summary
         description of the terms of the Acquisition shall have been provided to
         the Lenders at least ten (10) Business Days prior to the date that the
         proposed Acquisition is to be consummated.

         "Person" means any natural person, corporation, firm, joint venture,
partnership, limited liability company, association, enterprise, trust or other
entity or organization, or any government or political subdivision or any
agency, department or instrumentality thereof.

         "Plan" means an employee pension benefit plan which is covered by Title
IV of ERISA or subject to the minimum funding standards under Section 412 of the
Code as to which the Borrower or any member of the Controlled Group may have any
liability.

         "Pricing Schedule" means the schedule attached hereto as Exhibit A.

         "Prime Rate" means a rate per annum equal to the prime rate of interest
announced from time to time by Bank One or its parent (which is not necessarily
the lowest rate charged to any customer), changing when and as said prime rate
changes.

         "Pro Rata Share" means, with respect to a Lender, a portion equal to a
fraction the numerator of which is such Lender's Commitment and the denominator
of which is the Aggregate Commitment.

         "Property" of a Person means any and all property, whether real,
personal, tangible, intangible, or mixed, of such Person, or other assets owned,
leased or operated by such Person.

                                      -12-
<PAGE>   20

         "Purchasers" is defined in Section 12.3.1.

         "Rate Management Obligations" of a Person means any and all obligations
of such Person, whether absolute or contingent and howsoever and whensoever
created, arising, evidenced or acquired (including all renewals, extensions and
modifications thereof and substitutions therefor), under (i) any and all Rate
Management Transactions, and (ii) any and all cancellations, buy backs,
reversals, terminations or assignments of any Rate Management Transactions.

         "Rate Management Transaction" means any transaction (including an
agreement with respect thereto) now existing or hereafter which is a rate swap,
basis swap, forward rate transaction, commodity swap, commodity option, equity
or equity index swap, equity or equity index option, bond option, interest rate
option, foreign exchange transaction, cap transaction, floor transaction, collar
transaction, forward transaction, currency swap transaction, cross-currency rate
swap transaction, currency option or any other similar transaction (including
any option with respect to any of these transactions) or any combination
thereof, whether linked to one or more interest rates, foreign currencies,
commodity prices, equity prices or other financial measures.

         "Regulation D" means Regulation D of the Board of Governors of the
Federal Reserve System as from time to time in effect and any successor thereto
or other regulation or official interpretation of said Board of Governors
relating to reserve requirements applicable to member banks of the Federal
Reserve System.

         "Regulation U" means Regulation U of the Board of Governors of the
Federal Reserve System as from time to time in effect and any successor or other
regulation or official interpretation of said Board of Governors relating to the
extension of credit by banks for the purpose of purchasing or carrying margin
stocks applicable to member banks of the Federal Reserve System.

         "Reimbursement Obligations" means, at any time, the aggregate of all
obligations of the Borrower then outstanding under Section 2.19 to reimburse the
LC Issuer for amounts paid by the LC Issuer in respect of any one or more
drawings under Facility LCs.

         "Rentals" of a Person means the aggregate fixed amounts payable by such
Person under any Operating Lease.

         "Reportable Event" means a reportable event as defined in Section 4043
of ERISA and the regulations issued under such section, with respect to a Plan,
excluding, however, such events as to which the PBGC has by regulation waived
the requirement of Section 4043(a) of ERISA that it be notified within 30 days
of the occurrence of such event, provided, however, that a failure to meet the
minimum funding standard of Section 412 of the Code and of Section 302 of ERISA
shall be a Reportable Event regardless of the issuance of any such waiver of the
notice requirement in accordance with either Section 4043(a) of ERISA or Section
412(d) of the Code.

         "Reports" is defined in Section 9.6.

                                      -13-
<PAGE>   21

         "Required Lenders" means Lenders in the aggregate having at least 51%
of the Aggregate Commitment or, if the Aggregate Commitment has been terminated,
Lenders in the aggregate holding at least 51% of the Aggregate Outstanding
Credit Exposure.

         "Reserve Requirement" means, with respect to an Interest Period, the
maximum aggregate reserve requirement (including all basic, supplemental,
marginal and other reserves) which is imposed under Regulation D on Eurocurrency
liabilities.

         "Restatement Effective Time" is defined in Section 15.4.

         "Revolving Credit Facility" means the revolving credit facility
described in Section 2.1.

         "RGI" means Republic Group Incorporated, and its successors and
assigns.

         "RHC" means Republic Holding Corporation, a Nevada corporation, and its
successors and assigns

         "S&P" means Standard and Poor's Ratings Services, a division of The
McGraw Hill Companies, Inc.

         "Sale and Leaseback Transaction" means any sale or other transfer of
Property by any Person with the intent to lease such Property as lessee.

         "Schedule" refers to a specific schedule to this Agreement, unless
another document is specifically referenced.

         "Section" means a numbered section of this Agreement, unless another
document is specifically referenced.

         "Significant Subsidiary" means any Subsidiary which at any time has
total assets with a book or fair market value (determined in accordance with
Agreement Accounting Principles) equal to or greater than ten percent (10%) of
the Consolidated Tangible Net Worth. Significant Subsidiaries shall in any event
at all times be comprised of Subsidiaries which, when aggregated with the total
assets of the Borrower, in the aggregate have total assets with a book or fair
market value (determined in accordance with Agreement Accounting Principles)
equal to or greater than ninety percent (90%) of the total assets of the
Borrower and its Subsidiaries.

         "Single Employer Plan" means a Plan maintained by the Borrower or any
member of the Controlled Group for employees of the Borrower or any member of
the Controlled Group.

         "Subordinated Indebtedness" of a Person means any Indebtedness of such
Person the payment of which is subordinated to payment of the Obligations to the
written satisfaction of the Required Lenders.

         "Subsidiary" of a Person means (i) any corporation more than 50% of the
outstanding securities having ordinary voting power of which shall at the time
be owned or controlled, directly or indirectly, by such Person or by one or more
of its Subsidiaries or by such Person and one or more of its Subsidiaries, or
(ii) any partnership, limited liability company, association,

                                      -14-
<PAGE>   22

joint venture or similar business organization more than 50% of the ownership
interests having ordinary voting power of which shall at the time be so owned or
controlled. Unless otherwise expressly provided, all references herein to a
"Subsidiary" shall mean a Subsidiary of the Borrower.

         "Substantial Portion" means, with respect to the Property of the
Borrower and its Subsidiaries, Property which (i) represents more than 10% of
the consolidated assets of the Borrower and its Subsidiaries as would be shown
in the consolidated financial statements of the Borrower and its Subsidiaries as
at the beginning of the twelve-month period ending with the month in which such
determination is made, or (ii) is responsible for more than 10% of the
consolidated net sales or of the Consolidated EBITDA of the Borrower and its
Subsidiaries as reflected in the financial statements referred to in clause (i)
above.

         "Syndication Agent" means Bank of America, N.A., in its capacity as
syndication agent, and not in its individual capacity as a Lender.

         "Synthetic Lease" means a lease (i) that is treated as an operating
lease under Agreement Accounting Principles and (ii) (a) in respect of which the
leased asset is treated as owned by the lessee for purposes of the Code and/or
(b) that is treated as a loan to the lessee for commercial law or insolvency law
purposes.

         "Swing Line Advance" means any Advance under the Swing Line
Subfacility.

         "Swing Line Subfacility" means a subfacility under the Revolving Credit
Facility described in Section 2.21.

         "Target Senior Subordinated Notes" means those certain 9.5% Senior
Subordinated Notes in the aggregate principal amount of $100,000,000 executed by
the Republic Group Incorporated and payable to the order of certain Persons
named therein, as assumed by RHC pursuant to the supplemental indenture, dated
as of November 10, 2000, by and between UMB Bank N.A., as Trustee, and RHC and
as amended by the second supplemental indenture, dated as of June 18, 2001, by
and between UMB Bank N.A., as Trustee, and RHC.

         "Taxes" means any and all present or future governmental taxes, duties,
levies, imposts, deductions, charges or withholdings, and any and all
liabilities with respect to the foregoing, but excluding Excluded Taxes and
Other Taxes.

         "Transferee" is defined in Section 12.4.

         "Type" means, with respect to any Advance, its nature as a Floating
Rate Advance or a Eurodollar Advance.

         "Unfunded Liabilities" means the amount (if any) by which the present
value of all vested and unvested accrued benefits under all Single Employer
Plans exceeds the fair market value of all such Plan assets allocable to such
benefits, all determined as of the then most recent valuation date for such
Plans using PBGC actuarial assumptions for single employer plan terminations.

                                      -15-
<PAGE>   23

         "Unmatured Default" means an event which but for the lapse of time or
the giving of notice, or both, would constitute a Default.

         "Wholly-Owned Subsidiary" of a Person means (i) any Subsidiary all of
the outstanding voting securities of which shall at the time be owned or
controlled, directly or indirectly, by such Person or one or more Wholly-Owned
Subsidiaries of such Person, or by such Person and one or more Wholly-Owned
Subsidiaries of such Person, or (ii) any partnership, limited liability company,
association, joint venture or similar business organization 100% of the
ownership interests having ordinary voting power of which shall at the time be
so owned or controlled.

         The foregoing definitions shall be equally applicable to both the
singular and plural forms of the defined terms.

                                   ARTICLE II

                                   THE CREDITS

         2.1. Commitment. From and including the date of this Agreement and
prior to the Facility Termination Date, each Lender severally agrees, on the
terms and conditions set forth in this Agreement, to (i) make Loans (other than
Swing Line Advances) to the Borrower, (ii) participate in Swing Line Advances,
and (iii) participate in Facility LCs issued upon the request of the Borrower,
provided that, after giving effect to the making of each such Loan (including
the Swing Line Advances) and the issuance of each such Facility LC, such
Lender's Outstanding Credit Exposure shall not exceed its Commitment. Subject to
the terms of this Agreement, the Borrower may borrow, repay and reborrow at any
time prior to the Facility Termination Date. The Commitments to extend credit
hereunder shall expire on the Facility Termination Date. The LC Issuer will
issue Facility LCs hereunder on the terms and conditions set forth in Section
2.19. The Administrative Agent will make Swing Line Advances hereunder on the
terms and conditions set forth in Section 2.21.

         2.2. Required Payments; Termination. The Aggregate Outstanding Credit
Exposure and all other unpaid Obligations shall be paid in full by the Borrower
on the Facility Termination Date.

         2.3. Ratable Loans. Each Advance under the Revolving Credit Facility
shall consist of Loans made from the several Lenders ratably according to their
Pro Rata Shares.

         2.4. Types of Advances. The Advances under the Revolving Credit
Facility may be Floating Rate Advances or Eurodollar Advances, or a combination
thereof, selected by the Borrower in accordance with Sections 2.8 and 2.9.

         2.5. Commitment Fee; Reductions in Aggregate Commitment. The Borrower
agrees to pay to the Administrative Agent for the account of each Lender
according to its Pro Rata Share a commitment fee at a per annum rate equal to
the Applicable Fee Rate on the average daily Available Aggregate Commitment from
the date hereof to and including the Facility Termination Date, payable on each
Payment Date hereafter and on the Facility Termination Date. The Borrower may
permanently reduce the Aggregate Commitment in whole, or in part

                                      -16-
<PAGE>   24

ratably among the Lenders in integral multiples of $5,000,000, upon at least
five Business Days' written notice to the Administrative Agent, which notice
shall specify the amount of any such reduction; provided, however, that the
amount of the Aggregate Commitment may not be reduced below the Aggregate
Outstanding Credit Exposure. All accrued commitment fees shall be payable on the
effective date of any termination of the obligations of the Lenders to make
Credit Extensions hereunder.

         2.6. Minimum Amount of Each Advance. Each Eurodollar Advance shall be
in the minimum amount of $1,000,000 (and in multiples of $100,000 if in excess
thereof), and each Floating Rate Advance shall be in the minimum amount of
$1,000,000 (and in multiples of $100,000 if in excess thereof); provided,
however, that any Floating Rate Advance may be in the amount of the Available
Aggregate Commitment.

         2.7. Optional Principal Payments. The Borrower may from time to time
pay, without penalty or premium, all outstanding Floating Rate Advances, or, in
a minimum aggregate amount of $1,000,000 or any integral multiple of $100,000 in
excess thereof, any portion of the outstanding Floating Rate Advances not later
than 1:00 p.m. (Dallas time) upon prior notice to the Administrative Agent on
the date of such prepayment. The Borrower may from time to time pay, subject to
the payment of any funding indemnification amounts required by Section 3.4 but
without penalty or premium, all outstanding Eurodollar Advances, or, in a
minimum aggregate amount of $1,000,000 or any integral multiple of $100,000 in
excess thereof, any portion of the outstanding Eurodollar Advances upon three
Business Days' prior notice to the Administrative Agent.

         2.8. Method of Selecting Types and Interest Periods for New Advances.
Except with respect to Swing Line Advances, the Borrower shall select the Type
of Advance and, in the case of each Eurodollar Advance, the Interest Period
applicable thereto from time to time. The Borrower shall give the Administrative
Agent irrevocable notice (a "Borrowing Notice") not later than 10:00 a.m.
(Dallas time) at least one Business Day before the Borrowing Date of each
Floating Rate Advance and three Business Days before the Borrowing Date for each
Eurodollar Advance, specifying:

                  (i) the Borrowing Date, which shall be a Business Day, of such
         Advance,

                  (ii) the aggregate amount of such Advance,

                  (iii) the Type of Advance selected, and

                  (iv) in the case of each Eurodollar Advance, the Interest
         Period applicable thereto.

Not later than noon (Dallas time) on each Borrowing Date, each Lender shall make
available its Loan or Loans in funds immediately available in Dallas to the
Administrative Agent at its address specified pursuant to Article XIII. The
Administrative Agent will make the funds so received from the Lenders available
to the Borrower at the Administrative Agent's aforesaid address.

                                      -17-
<PAGE>   25

         2.9. Conversion and Continuation of Outstanding Advances. Floating Rate
Advances shall continue as Floating Rate Advances unless and until such Floating
Rate Advances are converted into Eurodollar Advances pursuant to this Section
2.9 or are repaid in accordance with Section 2.7. Each Eurodollar Advance shall
continue as a Eurodollar Advance until the end of the then applicable Interest
Period therefor, at which time such Eurodollar Advance shall be automatically
converted into a Floating Rate Advance unless (x) such Eurodollar Advance is or
was repaid in accordance with Section 2.7 or (y) the Borrower shall have given
the Administrative Agent a Conversion/Continuation Notice (as defined below)
requesting that, at the end of such Interest Period, such Eurodollar Advance
continue as a Eurodollar Advance for the same or another Interest Period.
Subject to the terms of Section 2.6, the Borrower may elect from time to time to
convert all or any part of a Floating Rate Advance (other than Swing Line
Advances) into a Eurodollar Advance. The Borrower shall give the Administrative
Agent irrevocable notice (a "Conversion/Continuation Notice") of each conversion
of a Floating Rate Advance into a Eurodollar Advance or continuation of a
Eurodollar Advance not later than 10:00 a.m. (Dallas time) at least three
Business Days prior to the date of the requested conversion or continuation,
specifying:

                  (i) the requested date, which shall be a Business Day, of such
         conversion or continuation,

                  (ii) the aggregate amount and Type of the Advance which is to
         be converted or continued, and

                  (iii) the amount of such Advance which is to be converted into
         or continued as a Eurodollar Advance and the duration of the Interest
         Period applicable thereto.

         2.10. Changes in Interest Rate, etc. Each Floating Rate Advance shall
bear interest on the outstanding principal amount thereof, for each day from and
including the date such Advance is made or is automatically converted from a
Eurodollar Advance into a Floating Rate Advance pursuant to Section 2.9, to but
excluding the date it is paid or is converted into a Eurodollar Advance pursuant
to Section 2.9 hereof, at a rate per annum equal to the lesser of (a) the
Maximum Rate, or (b) the Floating Rate for such day. Changes in the rate of
interest on that portion of any Advance maintained as a Floating Rate Advance
will take effect simultaneously with each change in the Alternate Base Rate. If
at any time the Floating Rate shall exceed the Maximum Rate, thereby causing the
interest accruing on an Advance to be limited to the Maximum Rate, then any
subsequent reduction in the Floating Rate for such Advance shall not reduce the
rate of interest on such Advance below the Maximum Rate until the aggregate
amount of interest accrued on such Advance equals the aggregate amount of
interest which would have accrued on such Advance if the Floating Rate had at
all times been in effect. Each Eurodollar Advance shall bear interest on the
outstanding principal amount thereof from and including the first day of the
Interest Period applicable thereto to (but not including) the last day of such
Interest Period at the interest rate determined by the Administrative Agent as
applicable to such Eurodollar Advance based upon the Borrower's selections under
Sections 2.8 and 2.9 and otherwise in accordance with the terms hereof. No
Interest Period may end after the Facility Termination Date.

                                      -18-
<PAGE>   26

         2.11. Rates Applicable After Default. Notwithstanding anything to the
contrary contained in Section 2.8 or 2.9, during the continuance of a Default or
Unmatured Default the Required Lenders may, at their option, by notice to the
Borrower, declare that no Advance may be made as, converted into or continued as
a Eurodollar Advance. During the continuance of a Default the Required Lenders
may, at their option, by notice to the Borrower, declare that (i) each
Eurodollar Advance shall bear interest for the remainder of the applicable
Interest Period at the rate otherwise applicable to such Interest Period (but
calculated as if the highest Applicable Margin was then in effect) plus 2% per
annum, (ii) each Floating Rate Advance shall bear interest at a rate per annum
equal to the Floating Rate in effect from time to time (but calculated as if the
highest Applicable Margin was then in effect) plus 2% per annum and (iii) the LC
Fee shall be calculated as if the highest Applicable Margin was then in effect
and increased by 2% per annum, provided that, during the continuance of a
Default under Section 7.6 or 7.7, the interest rates set forth in clauses (i)
and (ii) above and the increase in the LC Fee set forth in clause (iii) above
shall be applicable to all Credit Extensions without any election or action on
the part of the Administrative Agent or any Lender, subject in all events to the
limitations of the Maximum Rate.

         2.12. Method of Payment. All payments of the Obligations hereunder
shall be made, without setoff, deduction, or counterclaim, in immediately
available funds to the Administrative Agent at the Administrative Agent's
address specified pursuant to Article XIII, or at any other Lending Installation
of the Administrative Agent specified in writing by the Administrative Agent to
the Borrower, by noon (local time) on the date when due and shall (except in the
case of Reimbursement Obligations for which the LC Issuer has not been fully
indemnified by the Lenders, or as otherwise specifically required hereunder) be
applied ratably by the Administrative Agent among the Lenders. Each payment
delivered to the Administrative Agent for the account of any Lender shall be
delivered promptly by the Administrative Agent to such Lender in the same type
of funds that the Administrative Agent received at its address specified
pursuant to Article XIII or at any Lending Installation specified in a notice
received by the Administrative Agent from such Lender. The Administrative Agent
is hereby authorized to charge the account of the Borrower maintained with Bank
One for each payment of principal, interest, Reimbursement Obligations and fees
as it becomes due hereunder. Each reference to the Administrative Agent in this
Section 2.12 shall also be deemed to refer, and shall apply equally, to the LC
Issuer, in the case of payments required to be made by the Borrower to the LC
Issuer pursuant to Section 2.19.6.

         2.13. Noteless Agreement; Evidence of Indebtedness.

                  (i) Each Lender shall maintain in accordance with its usual
         practice an account or accounts evidencing the indebtedness of the
         Borrower to such Lender resulting from each Loan made by such Lender
         from time to time, including the amounts of principal and interest
         payable and paid to such Lender from time to time hereunder.

                  (ii) The Administrative Agent shall also maintain accounts in
         which it will record (a) the amount of each Loan made hereunder, the
         Type thereof and the Interest Period with respect thereto, (b) the
         amount of any principal or interest due and payable or to become due
         and payable from the Borrower to each Lender hereunder, (c) the
         original stated amount of each Facility LC and the amount of LC
         Obligations outstanding at any

                                      -19-
<PAGE>   27

         time, and (d) the amount of any sum received by the Administrative
         Agent hereunder from the Borrower and each Lender's share thereof.

                  (iii) The entries maintained in the accounts maintained
         pursuant to paragraphs (i) and (ii) above shall be prima facie evidence
         of the existence and amounts of the Obligations therein recorded;
         provided, however, that the failure of the Administrative Agent or any
         Lender to maintain such accounts or any error therein shall not in any
         manner affect the obligation of the Borrower to repay the Obligations
         in accordance with their terms.

                  (iv) Any Lender may request that its Loans under the Revolving
         Credit Facility be evidenced by a promissory note in substantially the
         form of Exhibit E (a "Note"). In such event, the Borrower shall
         prepare, execute and deliver to such Lender a Note payable to the order
         of such Lender in a form supplied by the Administrative Agent.
         Thereafter, the Loans evidenced by such Note and interest thereon shall
         at all times (including after any assignment pursuant to Section 12.3)
         be represented by one or more Notes payable to the order of the payee
         named therein or any assignee pursuant to Section 12.3, except to the
         extent that any such Lender or assignee subsequently returns any such
         Note for cancellation and requests that such Loans once again be
         evidenced as described in clauses (i) and (ii) above.

         2.14. Telephonic Notices. The Borrower hereby authorizes the Lenders
and the Administrative Agent to extend, convert or continue Advances, effect
selections of Types of Advances and to transfer funds based on telephonic
notices made by any person or persons the Administrative Agent or any Lender in
good faith believes to be acting on behalf of the Borrower, it being understood
that the foregoing authorization is specifically intended to allow Borrowing
Notices and Conversion/Continuation Notices to be given telephonically. The
Borrower agrees to deliver promptly to the Administrative Agent a written
confirmation, if such confirmation is requested by the Administrative Agent or
any Lender, of each telephonic notice signed by an Authorized Officer. If the
written confirmation differs in any material respect from the action taken by
the Administrative Agent and the Lenders, the records of the Administrative
Agent and the Lenders shall govern absent manifest error.

         2.15. Interest Payment Dates; Interest and Fee Basis. Interest accrued
on each Floating Rate Advance shall be payable on each Payment Date, commencing
with the first such date to occur after the date hereof and at maturity.
Interest accrued on each Eurodollar Advance shall be payable on the last day of
its applicable Interest Period, on any date on which the Eurodollar Advance is
prepaid, whether by acceleration or otherwise, and at maturity. Interest accrued
on each Eurodollar Advance having an Interest Period longer than three months
shall also be payable on the last day of each three-month interval during such
Interest Period. Interest, commitment fees and LC Fees shall be calculated for
actual days elapsed on the basis of a 360-day year. Interest shall be payable
for the day an Advance is made but not for the day of any payment on the amount
paid if payment is received prior to noon (local time) at the place of payment.
If any payment of principal of or interest on an Advance shall become due on a
day which is not a Business Day, such payment shall be made on the next
succeeding Business Day and, in the case of a principal payment, such extension
of time shall be included in computing interest in connection with such payment.

                                      -20-
<PAGE>   28

         2.16. Notification of Advances, Interest Rates, Prepayments and
Commitment Reductions. Promptly after receipt thereof, the Administrative Agent
will notify each Lender of the contents of each Aggregate Commitment reduction
notice, Borrowing Notice, Conversion/Continuation Notice, and repayment notice
received by it hereunder. Promptly after notice from the LC Issuer, the
Administrative Agent will notify each Lender of the contents of each request for
issuance of a Facility LC hereunder. The Administrative Agent will notify each
Lender of the interest rate applicable to each Eurodollar Advance promptly upon
determination of such interest rate and will give each Lender prompt notice of
each change in the Alternate Base Rate.

         2.17. Lending Installations. Each Lender may book its Loans and its
participation in any LC Obligations and the LC Issuer may book the Facility LCs
at any Lending Installation selected by such Lender or the LC Issuer, as the
case may be, and may change its Lending Installation from time to time. All
terms of this Agreement shall apply to any such Lending Installation and the
Loans, Facility LCs, participations in LC Obligations and any Notes issued
hereunder shall be deemed held by each Lender or the LC Issuer, as the case may
be, for the benefit of any such Lending Installation. Each Lender and the LC
Issuer may, by written notice to the Administrative Agent and the Borrower in
accordance with Article XIII, designate replacement or additional Lending
Installations through which Loans will be made by it or Facility LCs will be
issued by it and for whose account Loan payments or payments with respect to
Facility LCs are to be made.

         2.18. Non-Receipt of Funds by the Administrative Agent. Unless the
Borrower or a Lender, as the case may be, notifies the Administrative Agent
prior to the date on which it is scheduled to make payment to the Administrative
Agent of (i) in the case of a Lender, the proceeds of a Loan or (ii) in the case
of the Borrower, a payment of principal, interest or fees to the Administrative
Agent for the account of the Lenders, that it does not intend to make such
payment, the Administrative Agent may assume that such payment has been made.
The Administrative Agent may, but shall not be obligated to, make the amount of
such payment available to the intended recipient in reliance upon such
assumption. If such Lender or the Borrower, as the case may be, has not in fact
made such payment to the Administrative Agent, the recipient of such payment
shall, on demand by the Administrative Agent, repay to the Administrative Agent
the amount so made available together with interest thereon in respect of each
day during the period commencing on the date such amount was so made available
by the Administrative Agent until the date the Administrative Agent recovers
such amount at a rate per annum equal to (x) in the case of payment by a Lender,
the Federal Funds Effective Rate for such day for the first three days and,
thereafter, the interest rate applicable to the relevant Loan or (y) in the case
of payment by the Borrower, the interest rate applicable to the relevant Loan.

         2.19. Facility LCs.

                  2.19.1 Issuance. Subject to the terms and conditions of this
         Agreement, the LC Issuer agrees to keep outstanding on and after the
         date hereof the standby letters of credit for the account of the
         Borrower which were issued by the LC Issuer and which are further
         described on Schedule 3 (collectively, the "Existing Facility LCs").
         Each Existing Facility LC shall constitute a Facility LC for all
         purposes of this Agreement. For purposes hereof, the Existing Facility
         LCs are deemed to be issued on the date hereof.

                                      -21-
<PAGE>   29

         Furthermore, the LC Issuer hereby agrees, on the terms and conditions
         set forth in this Agreement, to issue standby and commercial letters of
         credit (each, a "Facility LC") and to renew, extend, increase, decrease
         or otherwise modify each Facility LC ("Modify," and each such action a
         "Modification"), from time to time from and including the date of this
         Agreement and prior to the Facility Termination Date upon the request
         of the Borrower; provided that immediately after each such Facility LC
         is issued or Modified, (i) the aggregate amount of the outstanding LC
         Obligations shall not exceed $15,000,000 and (ii) the Aggregate
         Outstanding Credit Exposure shall not exceed the Aggregate Commitment.
         No Facility LC shall have an expiry date later than the earlier of (x)
         the fifth Business Day prior to the Facility Termination Date and (y)
         one year after its issuance.

                  2.19.2 Participations. Upon the issuance or Modification by
         the LC Issuer of a Facility LC in accordance with this Section 2.19,
         the LC Issuer shall be deemed, without further action by any party
         hereto, to have unconditionally and irrevocably sold to each Lender,
         and each Lender shall be deemed, without further action by any party
         hereto, to have unconditionally and irrevocably purchased from the LC
         Issuer, a participation in such Facility LC (and each Modification
         thereof) and the related LC Obligations in proportion to its Pro Rata
         Share.

                  2.19.3 Notice. Subject to Section 2.19.1, the Borrower shall
         give the LC Issuer notice prior to 10:00 a.m. (Dallas time) at least
         five Business Days prior to the proposed date of issuance or
         Modification of each Facility LC, specifying the beneficiary, the
         proposed date of issuance (or Modification) and the expiry date of such
         Facility LC, and describing the proposed terms of such Facility LC and
         the nature of the transactions proposed to be supported thereby. Upon
         receipt of such notice, the LC Issuer shall promptly notify the
         Administrative Agent, and the Administrative Agent shall promptly
         notify each Lender, of the contents thereof and of the amount of such
         Lender's participation in such proposed Facility LC. The issuance or
         Modification by the LC Issuer of any Facility LC shall, in addition to
         the conditions precedent set forth in Article IV (the satisfaction of
         which the LC Issuer shall have no duty to ascertain), be subject to the
         conditions precedent that such Facility LC shall be reasonably
         satisfactory to the LC Issuer and that the Borrower shall have executed
         and delivered such application agreement and/or such other instruments
         and agreements relating to such Facility LC as the LC Issuer shall have
         reasonably requested (each, a "Facility LC Application"). In the event
         of any conflict between the terms of this Agreement and the terms of
         any Facility LC Application, the terms of this Agreement shall control.

                  2.19.4 LC Fees. The Borrower shall pay to the Administrative
         Agent, for the account of the Lenders ratably in accordance with their
         respective Pro Rata Shares, (i) with respect to each standby Facility
         LC, a letter of credit fee at a per annum rate equal to the Applicable
         Margin for Eurodollar Loans in effect from time to time on the average
         daily undrawn stated amount under such standby Facility LC, such fee to
         be payable in arrears on each Payment Date, and (ii) with respect to
         each commercial Facility LC, a one-time letter of credit fee in an
         amount equal to 0.125% of the initial stated amount (or, with respect
         to a Modification of any such commercial Facility LC which increases
         the stated amount thereof, such increase in the stated amount) thereof,
         such fee to be payable

                                      -22-
<PAGE>   30

         on the date of such issuance or increase (each such fee described in
         this sentence an "LC Fee"). The Borrower shall also pay to the LC
         Issuer for its own account (x) at the time of issuance of each Facility
         LC, a fronting fee in an amount to be agreed upon between the LC Issuer
         and the Borrower, and (y) documentary and processing charges in
         connection with the issuance or Modification of and draws under
         Facility LCs in accordance with the LC Issuer's standard schedule for
         such charges as in effect from time to time.

                  2.19.5 Administration; Reimbursement by Lenders. Upon receipt
         from the beneficiary of any Facility LC of any demand for payment under
         such Facility LC, the LC Issuer shall notify the Administrative Agent
         and the Administrative Agent shall promptly notify the Borrower and
         each other Lender as to the amount to be paid by the LC Issuer as a
         result of such demand and the proposed payment date (the "LC Payment
         Date"). The responsibility of the LC Issuer to the Borrower and each
         Lender shall be only to determine that the documents (including each
         demand for payment) delivered under each Facility LC in connection with
         such presentment shall be in conformity in all material respects with
         such Facility LC. The LC Issuer shall endeavor to exercise the same
         care in the issuance and administration of the Facility LCs as it does
         with respect to letters of credit in which no participations are
         granted, it being understood that in the absence of any gross
         negligence or willful misconduct by the LC Issuer, each Lender shall be
         unconditionally and irrevocably liable without regard to the occurrence
         of any Default or any condition precedent whatsoever, to reimburse the
         LC Issuer on demand for (i) such Lender's Pro Rata Share of the amount
         of each payment made by the LC Issuer under each Facility LC to the
         extent such amount is not reimbursed by the Borrower pursuant to
         Section 2.19.6 below, plus (ii) interest on the foregoing amount to be
         reimbursed by such Lender, for each day from the date of the LC
         Issuer's demand for such reimbursement (or, if such demand is made
         after 11:00 a.m. (Dallas time) on such date, from the next succeeding
         Business Day) to the date on which such Lender pays the amount to be
         reimbursed by it, at a rate of interest per annum equal to the Federal
         Funds Effective Rate for the first three days and, thereafter, at a
         rate of interest equal to the rate applicable to Floating Rate
         Advances.

                  2.19.6 Reimbursement by Borrower. The Borrower shall be
         irrevocably and unconditionally obligated to reimburse the LC Issuer on
         or before the applicable LC Payment Date for any amounts to be paid by
         the LC Issuer upon any drawing under any Facility LC, without
         presentment, demand, protest or other formalities of any kind; provided
         that neither the Borrower nor any Lender shall hereby be precluded from
         asserting any claim for direct (but not consequential) damages suffered
         by the Borrower or such Lender to the extent, but only to the extent,
         caused by (i) the willful misconduct or gross negligence of the LC
         Issuer in determining whether a request presented under any Facility LC
         issued by it complied with the terms of such Facility LC or (ii) the LC
         Issuer's failure to pay under any Facility LC issued by it after the
         presentation to it of a request strictly complying with the terms and
         conditions of such Facility LC. All such amounts paid by the LC Issuer
         and remaining unpaid by the Borrower shall bear interest, payable on
         demand, for each day until paid at a rate per annum equal to (x) the
         rate applicable to Floating Rate Advances for such day if such day
         falls on or before the applicable LC Payment Date and (y) the sum of 2%
         plus the rate applicable to Floating Rate Advances for such day if such
         day falls after such LC Payment Date. The LC Issuer

                                      -23-
<PAGE>   31

         will pay to each Lender ratably in accordance with its Pro Rata Share
         all amounts received by it from the Borrower for application in
         payment, in whole or in part, of the Reimbursement Obligation in
         respect of any Facility LC issued by the LC Issuer, but only to the
         extent such Lender has made payment to the LC Issuer in respect of such
         Facility LC pursuant to Section 2.19.5. Subject to the terms and
         conditions of this Agreement (including without limitation the
         submission of a Borrowing Notice in compliance with Section 2.8 and the
         satisfaction of the applicable conditions precedent set forth in
         Article IV), the Borrower may request an Advance hereunder for the
         purpose of satisfying any Reimbursement Obligation.

                  2.19.7 Obligations Absolute. The Borrower's obligations under
         this Section 2.19 shall be absolute and unconditional under any and all
         circumstances and irrespective of any setoff, counterclaim or defense
         to payment which the Borrower may have or have had against the LC
         Issuer, any Lender or any beneficiary of a Facility LC. The Borrower
         further agrees with the LC Issuer and the Lenders that the LC Issuer
         and the Lenders shall not be responsible for, and the Borrower's
         Reimbursement Obligation in respect of any Facility LC shall not be
         affected by, among other things, the validity or genuineness of
         documents or of any endorsements thereon, even if such documents should
         in fact prove to be in any or all respects invalid, fraudulent or
         forged, or any dispute between or among the Borrower, any of its
         Affiliates, the beneficiary of any Facility LC or any financing
         institution or other party to whom any Facility LC may be transferred
         or any claims or defenses whatsoever of the Borrower or of any of its
         Affiliates against the beneficiary of any Facility LC or any such
         transferee. The LC Issuer shall not be liable for any error, omission,
         interruption or delay in transmission, dispatch or delivery of any
         message or advice, however transmitted, in connection with any Facility
         LC. The Borrower agrees that any action taken or omitted by the LC
         Issuer or any Lender under or in connection with each Facility LC and
         the related drafts and documents, if done without gross negligence, bad
         faith or willful misconduct, shall be binding upon the Borrower and
         shall not put the LC Issuer or any Lender under any liability to the
         Borrower. Nothing in this Section 2.19.7 is intended to limit the right
         of the Borrower to make a claim against the LC Issuer for damages as
         contemplated by the proviso to the first sentence of Section 2.19.6.

                  2.19.8 Actions of LC Issuer. The LC Issuer shall be entitled
         to rely, and shall be fully protected in relying, upon any Facility LC,
         draft, writing, resolution, notice, consent, certificate, affidavit,
         letter, cablegram, telegram, telecopy, telex or teletype message,
         statement, order or other document reasonably believed by it to be
         genuine and correct and to have been signed, sent or made by the proper
         Person or Persons, and upon advice and statements of legal counsel,
         independent accountants and other experts selected by the LC Issuer.
         The LC Issuer shall be fully justified in failing or refusing to take
         any action under this Agreement unless it shall first have received
         such advice or concurrence of the Required Lenders as it reasonably
         deems appropriate or it shall first be indemnified to its reasonable
         satisfaction by the Lenders against any and all liability and expense
         which may be incurred by it by reason of taking or continuing to take
         any such action. Notwithstanding any other provision of this Section
         2.19, the LC Issuer shall in all cases be fully protected in acting, or
         in refraining from acting, under this Agreement in accordance with a
         request of the Required Lenders, and such request and any action taken

                                      -24-
<PAGE>   32

         or failure to act pursuant thereto shall be binding upon the Lenders
         and any future holders of a participation in any Facility LC.

                  2.19.9 Indemnification. The Borrower hereby agrees to
         indemnify and hold harmless each Lender, the LC Issuer and the
         Administrative Agent, and their respective directors, officers, agents
         and employees from and against any and all claims and damages, losses,
         liabilities, costs or expenses (including reasonable attorneys' fees
         and disbursements) which such Lender, the LC Issuer or the
         Administrative Agent may incur (or which may be claimed against such
         Lender, the LC Issuer or the Administrative Agent by any Person
         whatsoever) by reason of or in connection with the issuance, execution
         and delivery or transfer of or payment or failure to pay under any
         Facility LC or any actual or proposed use of any Facility LC,
         including, without limitation, any claims, damages, losses,
         liabilities, costs or expenses which the LC Issuer may incur by reason
         of or in connection with (i) the failure of any other Lender to fulfill
         or comply with its obligations to the LC Issuer hereunder (but nothing
         herein contained shall affect any rights the Borrower may have against
         any defaulting Lender) or (ii) by reason of or on account of the LC
         Issuer issuing any Facility LC which specifies that the term
         "Beneficiary" included therein includes any successor by operation of
         law of the named Beneficiary, but which Facility LC does not require
         that any drawing by any such successor Beneficiary be accompanied by a
         copy of a legal document, satisfactory to the LC Issuer, evidencing the
         appointment of such successor Beneficiary; provided that the Borrower
         shall not be required to indemnify any Lender, the LC Issuer or the
         Administrative Agent or any director, officer, agent or employee
         thereof for any claims, damages, losses, liabilities, costs or expenses
         to the extent, but only to the extent, caused by (x) the willful
         misconduct, bad faith or gross negligence of the LC Issuer in
         determining whether a request presented under any Facility LC complied
         with the terms of such Facility LC or (y) the LC Issuer's failure to
         pay under any Facility LC after the presentation to it of a request
         strictly complying with the terms and conditions of such Facility LC.
         Nothing in this Section 2.19.9 is intended to limit the obligations of
         the Borrower under any other provision of this Agreement.

                  2.19.10 Lenders' Indemnification. Each Lender shall, ratably
         in accordance with its Pro Rata Share, indemnify the LC Issuer, its
         Affiliates and their respective directors, officers, agents and
         employees (to the extent not reimbursed by the Borrower) against any
         cost, expense (including reasonable counsel fees and disbursements),
         claim, demand, action, loss or liability (except such as result from
         such indemnitees' gross negligence or willful misconduct or the LC
         Issuer's failure to pay under any Facility LC after the presentation to
         it of a request strictly complying with the terms and conditions of the
         Facility LC) that such indemnitees may suffer or incur in connection
         with this Section 2.19 or any action taken or omitted by such
         indemnitees hereunder.

                  2.19.11 Facility LC Collateral Account. The Borrower agrees
         that it will, after the occurrence of a Default and upon the request of
         the Administrative Agent or the Required Lenders and until the final
         expiration date of any Facility LC and thereafter as long as any amount
         is payable to the LC Issuer or the Lenders in respect of any Facility
         LC, maintain a special collateral account pursuant to arrangements
         satisfactory to the Administrative Agent (the "Facility LC Collateral
         Account") at the Administrative

                                      -25-
<PAGE>   33

         Agent's office at the address specified pursuant to Article XIII, in
         the name of the Borrower but under the sole dominion and control of the
         Administrative Agent, for the benefit of the Lenders and in which the
         Borrower shall have no interest other than as set forth in Section 8.1.
         The Borrower hereby pledges, assigns and grants to the Administrative
         Agent, on behalf of and for the ratable benefit of the Lenders and the
         LC Issuer, a security interest in all of the Borrower's right, title
         and interest in and to all funds which may from time to time be on
         deposit in the Facility LC Collateral Account to secure the prompt and
         complete payment and performance of the Obligations. The Administrative
         Agent will invest any funds on deposit from time to time in the
         Facility LC Collateral Account in certificates of deposit of Bank One
         having a maturity not exceeding 30 days. Nothing in this Section
         2.19.11 shall either obligate the Administrative Agent to require the
         Borrower to deposit any funds in the Facility LC Collateral Account or
         limit the right of the Administrative Agent to release any funds held
         in the Facility LC Collateral Account in each case other than as
         required by Section 8.1.

                  2.19.12 Rights as a Lender. In its capacity as a Lender, the
         LC Issuer shall have the same rights and obligations as any other
         Lender.

         2.20. Replacement of Lender. If the Borrower is required pursuant to
Section 3.1, 3.2 or 3.5 to make any additional payment to any Lender or if any
Lender's obligation to make or continue, or to convert Floating Rate Advances
into, Eurodollar Advances shall be suspended pursuant to Section 3.3 (any Lender
so affected an "Affected Lender"), the Borrower may elect, if such amounts
continue to be charged or such suspension is still effective, to replace such
Affected Lender as a Lender party to this Agreement, provided that no Default or
Unmatured Default shall have occurred and be continuing at the time of such
replacement, and provided further that, concurrently with such replacement, (i)
another bank or other entity which is reasonably satisfactory to the Borrower
and the Administrative Agent shall agree, as of such date, to purchase for cash
the Credit Extensions and other Obligations due to the Affected Lender pursuant
to an assignment substantially in the form of Exhibit C and to become a Lender
for all purposes under this Agreement and to assume all obligations of the
Affected Lender to be terminated as of such date and to comply with the
requirements of Section 12.3 applicable to assignments, and (ii) the Borrower
shall pay to such Affected Lender in same day funds on the day of such
replacement (A) all interest, fees and other amounts then accrued but unpaid to
such Affected Lender by the Borrower hereunder to and including the date of
termination, including without limitation payments due to such Affected Lender
under Sections 3.1, 3.2 and 3.5, and (B) an amount, if any, equal to the payment
which would have been due to such Lender on the day of such replacement under
Section 3.4 had the Credit Extensions of such Affected Lender been prepaid on
such date rather than sold to the replacement Lender.

         2.21. Swing Line Subfacility.

                  2.21.1 Conditions. For the convenience of the parties,
         Administrative Agent, solely for its own account, may make any
         requested Advance under the Revolving Credit Facility (which request
         must be made before 1:00 p.m. (Dallas time) on the Business Day the
         Advance is to be made and may be telephonic if confirmed in writing
         within two Business Days) in the minimum amount of $100,000 (or a
         greater integral multiple of

                                      -26-
<PAGE>   34

         $100,000) directly to Borrower as a Swing Line Advance without
         requiring each other Lender to fund its Pro Rata Share thereof on such
         Business Day. Swing Line Advances are subject to the following
         conditions:

                  (i) Each Swing Line Advance must occur on a Business Day
         before the Facility Termination Date;

                  (ii) The aggregate principal outstanding of all Swing Line
         Advances may not exceed $15,000,000; the aggregate principal
         outstanding of all Swing Line Advances, all other Advances under the
         Revolving Credit Facility, and all LC Obligations may not exceed the
         Aggregate Commitment under the Revolving Credit Facility; and no Swing
         Line Advance shall be made which would cause the aggregate principal
         outstanding of all Loans (including Swing Line Advances) made by the
         Administrative Agent under the Revolving Credit Facility to exceed the
         Administrative Agent's Commitment under the Revolving Credit Facility;

                  (iii) Each Swing Line Advance shall be paid in full by the
         Borrower on the Business Day immediately succeeding the date of such
         Swing Line Advance by the funding of an Advance under the Revolving
         Credit Facility and in any event on the Facility Termination Date; and

                  (iv) Each Swing Line Advance shall be a Floating Rate Advance.

                  2.21.2 Lenders' Funding of Swing Line Advances as Advances
         Under Revolving Credit Facility. The Administrative Agent shall give to
         the Lenders notice of each Swing Line Advance not later than 3:00 p.m.
         (Dallas time) on the date of such Swing Line Advance, which notice
         shall, on behalf of the Borrower (and for such purpose the Borrower
         hereby irrevocably directs the Administrative Agent to act on its
         behalf), request each Lender to make, and each Lender hereby agrees to
         make, an Advance in an amount equal to such Lender's Pro Rata Share of
         the aggregate amount of the Swing Line Advances (the "Refunded Swing
         Line Advances") outstanding on the date of such notice, to repay the
         Administrative Agent. Each Lender shall make the amount of such Advance
         available to the Administrative Agent in immediately available funds,
         not later than noon (Dallas time) one Business Day after the date of
         such notice. The proceeds of such Advance shall be immediately made
         available to the Administrative Agent for application by the
         Administrative Agent to the repayment of the Refunded Swing Line
         Advances. The Borrower irrevocably authorizes the Administrative Agent
         to charge the Borrower's accounts with the Administrative Agent in
         order to immediately pay the amount of such Refunded Swing Line
         Advances to the extent amounts received from the Lenders are not
         sufficient to repay in full such Refunded Swing Line Advances (with
         notice of such charge being provided to the Borrower, provided that the
         failure to give such notice shall not affect the validity of such
         charge). All such Refunded Swing Line Advances shall be subject to all
         provisions of this Agreement concerning Advances under the Revolving
         Credit Facility. If prior to the time an Advance would otherwise have
         been made pursuant to this section, Advances may not be made as
         contemplated by this section, each Lender shall irrevocably and
         unconditionally purchase and receive from Administrative Agent a
         ratable participation in such Swing Line Advance and shall make

                                      -27-
<PAGE>   35

         available to Administrative Agent in immediately available funds its
         Pro Rata Share of such unpaid amount, together with interest from the
         date when its payment was due to, but not including, the date of
         payment. If a Lender does not promptly pay its amount upon
         Administrative Agent's demand, and until such Lender makes the required
         payment, Administrative Agent is deemed to continue to have outstanding
         a Swing Line Advance in the amount of such Lender's unpaid obligation.
         Borrower shall make each payment of all or any part of any Swing Line
         Advance to Administrative Agent for the ratable benefit of
         Administrative Agent and those Lenders who have funded their
         participations in Swing Line Advances under this Section (but all
         interest accruing on Swing Line Advances before the funding date of any
         Advance under the Revolving Credit Facility to repay such Swing Line
         Advance or any participation is payable solely to Administrative Agent
         for its own account).

         2.22. [Intentionally Deleted.]

         2.23. Prepayments from Sale of Assets. Concurrently with the receipt of
Net Cash Proceeds from the sale or disposition by the Borrower or any Subsidiary
of any assets at any time which are permitted to be sold or disposed of pursuant
to Section 6.13 of this Agreement (other than (i) the sale of inventory in the
ordinary course of business, (ii) when no Default exists, the sale of accounts
or notes receivable described in Section 6.13(iii), and (iii) when no Default
exists, other sales or dispositions which yield Net Cash Proceeds in an amount
not to exceed $5,000,000 in the aggregate during the term of this Agreement),
the Borrower shall prepay or cause to be prepaid the Advances in a principal
amount equal to 100% of such Net Cash Proceeds. Notwithstanding anything to the
contrary contained herein, any prepayment required by this Section 2.23 to be
applied to Eurodollar Loans may be paid by the Borrower into a segregated
interest bearing account of Borrower designated by the Administrative Agent for
application to the Loans upon the last day of an Interest Period applicable
thereto.

         2.24. [Intentionally Deleted.]

         2.25. Prepayments from Sales of Capital Stock. Concurrently with the
receipt of Net Cash Proceeds from the sale or disposition by Borrower to any
Person of any common stock, preferred stock, warrant or other equity interests
of Borrower, the Borrower shall prepay Advances in a principal amount equal to
100% of such Net Cash Proceeds; provided however, the Borrower is not required
to make a prepayment under this Section 2.25 if and to the extent that the
Borrower (a) issues common stock, preferred stock, warrant or other equity
interests pursuant to stock options and provides other stock based benefit
awards to the directors, officers or employees of the Borrower, its Subsidiaries
or Affiliates or (b) uses such Net Cash Proceeds solely to fund a Permitted
Acquisition, so long as in each case no Default has occurred and is continuing
immediately before and immediately after such issuance or payment.
Notwithstanding anything to the contrary contained herein, any prepayment
required by this Section 2.25 to be applied to Eurodollar Loans may be paid by
the Borrower into a segregated interest bearing account of the Borrower
designated by the Administrative Agent for application to the Loans upon the
last day of an Interest Period applicable thereto.

                                      -28-
<PAGE>   36

                                   ARTICLE III

                             YIELD PROTECTION; TAXES

         3.1. Yield Protection. If, on or after the date of this Agreement, the
adoption of any law or any governmental or quasi-governmental rule, regulation,
policy, guideline or directive (whether or not having the force of law), or any
change in the interpretation or administration thereof by any governmental or
quasi-governmental authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by any Lender or
applicable Lending Installation or the LC Issuer with any request or directive
(whether or not having the force of law) of any such authority, central bank or
comparable agency:

                  (i) subjects any Lender or any applicable Lending Installation
         or the LC Issuer to any Taxes, or changes the basis of taxation of
         payments (other than with respect to Excluded Taxes) to any Lender or
         the LC Issuer in respect of its Eurodollar Loans, Facility LCs or
         participations therein, or

                  (ii) imposes or increases or deems applicable any reserve,
         assessment, insurance charge, special deposit or similar requirement
         against assets of, deposits with or for the account of, or credit
         extended by, any Lender or any applicable Lending Installation or the
         LC Issuer (other than reserves and assessments taken into account in
         determining the interest rate applicable to Eurodollar Advances), or

                  (iii) imposes any other condition the result of which is to
         increase the cost to any Lender or any applicable Lending Installation
         or the LC Issuer of making, funding or maintaining its Eurodollar
         Loans, or of issuing or participating in Facility LCs, or reduces any
         amount receivable by any Lender or any applicable Lending Installation
         or the LC Issuer in connection with its Eurodollar Loans, Facility LCs
         or participations therein, or requires any Lender or any applicable
         Lending Installation or the LC Issuer to make any payment calculated by
         reference to the amount of Eurodollar Loans, Facility LCs or
         participations therein held or interest or LC Fees received by it, by
         an amount deemed material by such Lender or the LC Issuer as the case
         may be,

and the result of any of the foregoing is to increase the cost to such Lender or
applicable Lending Installation or the LC Issuer, as the case may be, of making
or maintaining its Eurodollar Loans or Commitment or of issuing or participating
in Facility LCs or to reduce the return received by such Lender or applicable
Lending Installation or the LC Issuer, as the case may be, in connection with
such Eurodollar Loans, Commitment, Facility LCs or participations therein, then,
within 15 days of demand by such Lender or the LC Issuer, as the case may be,
the Borrower shall pay such Lender or the LC Issuer, as the case may be, such
additional amount or amounts as will compensate such Lender or the LC Issuer, as
the case may be, for such increased cost or reduction in amount received.

         3.2. Changes in Capital Adequacy Regulations. If a Lender or the LC
Issuer determines the amount of capital required or expected to be maintained by
such Lender or the LC Issuer, any Lending Installation of such Lender or the LC
Issuer, or any corporation controlling such Lender or the LC Issuer is increased
as a result of a Change, then, within 15 days of

                                      -29-
<PAGE>   37

demand by such Lender or the LC Issuer, the Borrower shall pay such Lender or
the LC Issuer the amount necessary to compensate for any shortfall in the rate
of return on the portion of such increased capital which such Lender or the LC
Issuer determines is attributable to this Agreement, its Outstanding Credit
Exposure or its Commitment to make Loans and issue or participate in Facility
LCs, as the case may be, hereunder (after taking into account such Lender's or
the LC Issuer's policies as to capital adequacy). "Change" means (i) any change
after the date of this Agreement in the Risk-Based Capital Guidelines, or (ii)
any adoption of or change in any other law, governmental or quasi-governmental
rule, regulation, policy, guideline, interpretation, or directive (whether or
not having the force of law) after the date of this Agreement which affects the
amount of capital required or expected to be maintained by any Lender or the LC
Issuer or any Lending Installation or any corporation controlling any Lender or
the LC Issuer. "Risk-Based Capital Guidelines" means (i) the risk-based capital
guidelines in effect in the United States on the date of this Agreement,
including transition rules, and (ii) the corresponding capital regulations
promulgated by regulatory authorities outside the United States implementing the
July 1988 report of the Basle Committee on Banking Regulation and Supervisory
Practices Entitled "International Convergence of Capital Measurements and
Capital Standards," including transition rules, and any amendments to such
regulations adopted prior to the date of this Agreement.

         3.3. Availability of Types of Advances. If any Lender determines that
maintenance of its Eurodollar Loans at a suitable Lending Installation would
violate any applicable law, rule, regulation, or directive, whether or not
having the force of law, or if the Required Lenders determine that (i) deposits
of a type and maturity appropriate to match fund Eurodollar Advances are not
available or (ii) the interest rate applicable to Eurodollar Advances does not
accurately reflect the cost of making or maintaining Eurodollar Advances, then
the Administrative Agent shall suspend the availability of Eurodollar Advances
and require any affected Eurodollar Advances to be repaid or converted to
Floating Rate Advances, subject to the payment of any funding indemnification
amounts required by Section 3.4.

         3.4. Funding Indemnification. If any payment of a Eurodollar Advance
occurs on a date which is not the last day of the applicable Interest Period,
whether because of acceleration, prepayment or otherwise, or a Eurodollar
Advance is not made on the date specified by the Borrower for any reason other
than default by the Lenders, the Borrower will indemnify each Lender for any
loss or cost incurred by it resulting therefrom, including, without limitation,
any loss or cost in liquidating or employing deposits acquired to fund or
maintain such Eurodollar Advance.

         3.5. Taxes.

                  (i) All payments by the Borrower to or for the account of any
         Lender, the LC Issuer or the Administrative Agent hereunder or under
         any Note or Facility LC Application shall be made free and clear of and
         without deduction for any and all Taxes. If the Borrower shall be
         required by law to deduct any Taxes from or in respect of any sum
         payable hereunder to any Lender, the LC Issuer or the Administrative
         Agent, (a) the sum payable shall be increased as necessary so that
         after making all required deductions (including deductions applicable
         to additional sums payable under this Section 3.5) such Lender, the LC
         Issuer or the Administrative Agent (as the case may be) receives an

                                      -30-
<PAGE>   38

         amount equal to the sum it would have received had no such deductions
         been made, (b) the Borrower shall make such deductions, (c) the
         Borrower shall pay the full amount deducted to the relevant authority
         in accordance with applicable law and (d) the Borrower shall furnish to
         the Administrative Agent the original copy of a receipt evidencing
         payment thereof within 30 days after such payment is made.

                  (ii) In addition, the Borrower hereby agrees to pay any
         present or future stamp or documentary taxes and any other excise or
         property taxes, charges or similar levies which arise from any payment
         made hereunder or under any Note or Facility LC Application or from the
         execution or delivery of, or otherwise with respect to, this Agreement
         or any Note or Facility LC Application ("Other Taxes").

                  (iii) The Borrower hereby agrees to indemnify the
         Administrative Agent, the LC Issuer and each Lender for the full amount
         of Taxes or Other Taxes (including, without limitation, any Taxes or
         Other Taxes imposed on amounts payable under this Section 3.5) paid by
         the Administrative Agent, the LC Issuer or such Lender and any
         liability (including penalties, interest and expenses) arising
         therefrom or with respect thereto. Payments due under this
         indemnification shall be made within 30 days of the date the
         Administrative Agent, the LC Issuer or such Lender makes demand
         therefor pursuant to Section 3.6.

                  (iv) Each Lender that is not incorporated under the laws of
         the United States of America or a state thereof (each a "Non-U.S.
         Lender") agrees that it will, not more than ten Business Days after the
         date of this Agreement, (i) deliver to the Borrower and the
         Administrative Agent two duly completed copies of United States
         Internal Revenue Service Form W-8BEN or W-8ECI, certifying in either
         case that such Lender is entitled to receive payments under this
         Agreement without deduction or withholding of any United States federal
         income taxes, and (ii) deliver to the Borrower and the Administrative
         Agent a United States Internal Revenue Form W-8 or W-9, as the case may
         be, and certify that it is entitled to an exemption from United States
         backup withholding tax. Each Non-U.S. Lender further undertakes to
         deliver to the Borrower and the Administrative Agent (x) renewals or
         additional copies of such form (or any successor form) on or before the
         date that such form expires or becomes obsolete, and (y) after the
         occurrence of any event requiring a change in the most recent forms so
         delivered by it, such additional forms or amendments thereto as may be
         reasonably requested by the Borrower or the Administrative Agent. All
         forms or amendments described in the preceding sentence shall certify
         that such Lender is entitled to receive payments under this Agreement
         without deduction or withholding of any United States federal income
         taxes, unless an event (including without limitation any change in
         treaty, law or regulation) has occurred prior to the date on which any
         such delivery would otherwise be required which renders all such forms
         inapplicable or which would prevent such Lender from duly completing
         and delivering any such form or amendment with respect to it and such
         Lender advises the Borrower and the Administrative Agent that it is not
         capable of receiving payments without any deduction or withholding of
         United States federal income tax.

                                      -31-
<PAGE>   39

                  (v) For any period during which a Non-U.S. Lender has failed
         to provide the Borrower with an appropriate form pursuant to clause
         (iv), above (unless such failure is due to a change in treaty, law or
         regulation, or any change in the interpretation or administration
         thereof by any governmental authority, occurring subsequent to the date
         on which a form originally was required to be provided), such Non-U.S.
         Lender shall not be entitled to indemnification under this Section 3.5
         with respect to Taxes imposed by the United States; provided that,
         should a Non-U.S. Lender which is otherwise exempt from or subject to a
         reduced rate of withholding tax become subject to Taxes because of its
         failure to deliver a form required under clause (iv) above, the
         Borrower shall take such steps as such Non-U.S. Lender shall reasonably
         request to assist such Non-U.S. Lender to recover such Taxes.

                  (vi) Any Lender that is entitled to an exemption from or
         reduction of withholding tax with respect to payments under this
         Agreement or any Note pursuant to the law of any relevant jurisdiction
         or any treaty shall deliver to the Borrower (with a copy to the
         Administrative Agent), at the time or times prescribed by applicable
         law, such properly completed and executed documentation prescribed by
         applicable law as will permit such payments to be made without
         withholding or at a reduced rate.

                  (vii) If the U.S. Internal Revenue Service or any other
         governmental authority of the United States or any other country or any
         political subdivision thereof asserts a claim that the Administrative
         Agent did not properly withhold tax from amounts paid to or for the
         account of any Lender (because the appropriate form was not delivered
         or properly completed, because such Lender failed to notify the
         Administrative Agent of a change in circumstances which rendered its
         exemption from withholding ineffective, or for any other reason), such
         Lender shall indemnify the Administrative Agent fully for all amounts
         paid, directly or indirectly, by the Administrative Agent as tax,
         withholding therefor, or otherwise, including penalties and interest,
         and including taxes imposed by any jurisdiction on amounts payable to
         the Administrative Agent under this subsection, together with all costs
         and expenses related thereto (including attorneys fees and time charges
         of attorneys for the Administrative Agent, which attorneys may be
         employees of the Administrative Agent). The obligations of the Lenders
         under this Section 3.5(vii) shall survive the payment of the
         Obligations and termination of this Agreement.

         3.6. Lender Statements; Survival of Indemnity. To the extent reasonably
possible, each Lender shall designate an alternate Lending Installation with
respect to its Eurodollar Loans to reduce any liability of the Borrower to such
Lender under Sections 3.1, 3.2 and 3.5 or to avoid the unavailability of
Eurodollar Advances under Section 3.3, so long as such designation is not, in
the reasonable judgment of such Lender, disadvantageous to such Lender. Each
Lender shall deliver a written statement of such Lender to the Borrower (with a
copy to the Administrative Agent) as to the amount due, if any, under Section
3.1, 3.2, 3.4 or 3.5. Such written statement shall set forth in reasonable
detail the calculations upon which such Lender determined such amount and shall
be final, conclusive and binding on the Borrower in the absence of manifest
error. Determination of amounts payable under such Sections in connection with a
Eurodollar Loan shall be calculated as though each Lender funded its Eurodollar
Loan through the purchase of a deposit of the type and maturity corresponding to
the deposit used as a reference in determining the Eurodollar Rate applicable to
such Loan, whether in fact that is the case or not.

                                      -32-
<PAGE>   40

Unless otherwise provided herein, the amount specified in the written statement
of any Lender shall be payable within 15 days after receipt by the Borrower of
such written statement. The obligations of the Borrower under Sections 3.1, 3.2,
3.4 and 3.5 shall survive payment of the Obligations and termination of this
Agreement.

                                   ARTICLE IV

                              CONDITIONS PRECEDENT

         4.1. Initial Advance. The Lenders shall not be required to make the
initial Credit Extension hereunder unless (a) the Borrower has furnished to the
Administrative Agent with sufficient copies for the Lenders or (b) the following
shall have occurred, as applicable:

                  (i) A bring down certificate of the Secretary or Assistant
         Secretary of the Borrower certifying that the articles or certificate
         of incorporation and the bylaws of the Borrower have not been modified
         in any respect from the copies previously provided to the
         Administrative Agent and the Lenders in connection with the Existing
         Credit Agreement and copies of the Borrower's Board of Directors'
         resolutions and of resolutions or actions of any other body authorizing
         the execution of the Loan Documents to which the Borrower is a party.

                  (ii) A bring down certificate of the Secretary or assistant
         Secretary of each Guarantor (other than American Gypsum Marketing
         Company, a Delaware corporation ("AGMC")) certifying that the articles
         or certificate of incorporation and the bylaws of such Guarantor have
         not been modified in any respect from the copies previously provided to
         the Administrative Agent and the Lenders in connection with the
         Existing Credit Agreement and copies of such Guarantor's Board of
         Directors' resolutions and of resolutions or actions of any other body
         authorizing the execution of the Loan Documents to which such Guarantor
         is a party.

                  (iii) Copies of the articles or certificate of incorporation
         or other charter documents of AGMC, together with all amendments,
         certified by the appropriate governmental officer in its jurisdiction
         of incorporation.

                  (iv) Copies certified by the Secretary or Assistant Secretary
         of AGMC, of its bylaws or other organization agreement, and of its
         Board of Directors resolutions or of resolutions or actions of any
         other body authorizing the execution of the Loan Documents to which
         AGMC is a party.

                  (v) Copies of certificates of existence and good standing of
         the Borrower, each certified by the appropriate governmental officer in
         its jurisdiction of organization.

                  (vi) An incumbency certificate, executed by the Secretary or
         Assistant Secretary of the Borrower, which shall identify by name and
         title and bear the signatures of the Authorized Officers and any other
         officers of the Borrower authorized to sign the Loan Documents to which
         the Borrower is a party, upon which certificate the

                                      -33-
<PAGE>   41

         Administrative Agent and the Lenders shall be entitled to rely until
         informed of any change in writing by the Borrower.

                  (vii) An incumbency certificate, executed by the Secretary or
         Assistant Secretary of each Guarantor, which shall identify by name and
         title and bear the signatures of the Authorized Officers and any other
         officers of such Guarantor authorized to sign the Loan Documents to
         which such Guarantor is a party, upon which certificate the
         Administrative Agent and the Lenders shall be entitled to rely until
         informed of any change in writing by such Guarantor.

                  (viii) Any Notes requested by a Lender pursuant to Section
         2.13 payable to the order of each such requesting Lender.

                  (ix) A Guaranty duly executed by the Guarantors.

                  (x) Payment for the account of each Lender who executes this
         Agreement on or before July 20, 2001 of a fee equal to 0.20% multiplied
         by the amount of such Lender's Commitment.

                  (xi) Payment of accrued and unpaid interest on the Obligations
         due and payable to July 20, 2001.

                  (xii) Such other documents as the Administrative Agent, any
         Lender or their counsel may have reasonably requested.

         4.2. Each Credit Extension. The Lenders shall not be required to make
any Credit Extension unless on the applicable Credit Extension Date:

                  (i) There exists no Default or Unmatured Default.

                  (ii) The representations and warranties contained in Article V
         are true and correct in all material respects as of such Credit
         Extension Date except to the extent any such representation or warranty
         is stated to relate solely to an earlier date, in which case such
         representation or warranty shall have been true and correct in all
         material respects on and as of such earlier date.

                  (iii) All legal matters incident to the making of such Credit
         Extension shall be reasonably satisfactory to the Lenders and their
         counsel.

                  (iv) If the Credit Extension will be the issuance of a
         Facility LC, a properly completed Facility LC Application shall have
         been executed and delivered to the LC Issuer.

         Each Borrowing Notice or request for issuance of a Facility LC with
respect to each such Credit Extension shall constitute a representation and
warranty by the Borrower that the conditions contained in Sections 4.2(i) and
(ii) have been satisfied. Any Lender may require a duly completed compliance
certificate in substantially the form of Exhibit B as a condition to making a
Credit Extension.

                                      -34-
<PAGE>   42

                                    ARTICLE V

                         REPRESENTATIONS AND WARRANTIES

         The Borrower represents and warrants to the Lenders that:

         5.1. Existence and Standing. Borrower and its Subsidiaries is a
corporation, partnership (in the case of Subsidiaries only) or limited liability
company (in the case of Subsidiaries only) duly and properly incorporated or
organized, as the case may be, validly existing and (to the extent such concept
applies to such entity) in good standing under the laws of its jurisdiction of
incorporation or organization, is duly qualified to transact business and is in
good standing in each jurisdiction in which its business is conducted except
where the failure to be so qualified could not reasonably be expected to have a
Material Adverse Effect.

         5.2. Authorization and Validity. The Borrower has the corporate power
and authority and legal right to execute and deliver the Loan Documents to which
it is a party and to perform its obligations thereunder. The execution and
delivery by the Borrower of the Loan Documents to which it is a party and the
performance of its obligations thereunder have been duly authorized by proper
corporate proceedings, and the Loan Documents to which the Borrower is a party
constitute legal, valid and binding obligations of the Borrower enforceable
against the Borrower in accordance with their terms, except as enforceability
may be limited by bankruptcy, insolvency or similar laws affecting the
enforcement of creditors' rights generally or general principles of equity.

         5.3. No Conflict; Government Consent. Neither the execution and
delivery by the Borrower of the Loan Documents to which it is a party, nor the
consummation of the transactions therein contemplated, nor compliance with the
provisions thereof will violate (i) any law, rule, regulation, order, writ,
judgment, injunction, decree or award binding on the Borrower or any of its
Subsidiaries other than violations which could not individually or in the
aggregate reasonably be expected to have a Material Adverse Effect or (ii) the
Borrower's or any Subsidiary's articles or certificate of incorporation,
partnership agreement, certificate of partnership, articles or certificate of
organization, by-laws, or operating or other management agreement, as the case
may be, or (iii) the provisions of any indenture, instrument or agreement to
which the Borrower or any of its Subsidiaries is a party or is subject, or by
which it, or its Property, is bound, or conflict with or constitute a default
thereunder, or result in, or require, the creation or imposition of any Lien in,
of or on the Property of the Borrower or a Subsidiary pursuant to the terms of
any such indenture, instrument or agreement. No order, consent, adjudication,
approval, license, authorization, or validation of, or filing, recording or
registration with, or exemption by, or other action in respect of any
governmental or public body or authority, or any subdivision thereof, which has
not been obtained by the Borrower or any of its Subsidiaries, is required to be
obtained by the Borrower or any of its Subsidiaries in connection with the
execution and delivery of the Loan Documents, the borrowings under this
Agreement, the payment and performance by the Borrower of the Obligations or the
legality, validity, binding effect or enforceability of any of the Loan
Documents except for such orders, consents, adjudications, approvals, licenses,
authorizations or validations of, or filings, recordings or registrations with,
or exemptions by or other actions the failure to obtain or make could not
individually or in the aggregate reasonably be expected to have a Material
Adverse Effect.

                                      -35-
<PAGE>   43

         5.4. Financial Statements. The March 31, 2001, consolidated financial
statements of the Borrower and its Subsidiaries heretofore delivered to the
Lenders were prepared in accordance with generally accepted accounting
principles in effect on the date such statements were prepared and fairly
present the consolidated financial condition and operations of the Borrower and
its Subsidiaries at such date and the consolidated results of their operations
for the period then ended.

         5.5. Material Adverse Change. Since March 31, 2001, there has been no
change in the business, Property, financial condition or results of operations
of the Borrower and its Subsidiaries taken as a whole which could reasonably be
expected to have a Material Adverse Effect.

         5.6. Taxes. The Borrower and its Subsidiaries have filed all United
States federal tax returns and all other tax returns which are required to be
filed and have paid all taxes due pursuant to said returns or pursuant to any
assessment received by the Borrower or any of its Subsidiaries, except such
taxes, if any, as are being contested in good faith and as to which adequate
reserves have been provided in accordance with Agreement Accounting Principles
and as to which no Lien exists and except where failure to file or pay could not
individually or in the aggregate reasonably be expected to have a Material
Adverse Effect. The latest period for which the Borrower and its Subsidiaries
have been examined or for which the applicable statute of limitations has
expired is the fiscal year ended March 31, 1996. No tax liens have been filed
and no claims are being asserted with respect to any such taxes which
individually or in the aggregate have a Material Adverse Effect. The charges,
accruals and reserves on the books of the Borrower and its Subsidiaries in
respect of any taxes or other governmental charges are adequate. If any of its
Subsidiaries is a limited liability company, each such limited liability company
qualifies for partnership tax treatment under United States federal tax law.

         5.7. Litigation and Contingent Obligations. There is no litigation,
arbitration, governmental investigation, proceeding or inquiry pending or, to
the knowledge of any of their officers, threatened against or affecting the
Borrower or any of its Subsidiaries which could individually or in the aggregate
reasonably be expected to have a Material Adverse Effect or which seeks to
prevent, enjoin or delay the making of any Credit Extensions. Other than any
liabilities which could not individually or in the aggregate reasonably be
expected to have a Material Adverse Effect, the Borrower has no material
contingent obligations not provided for or disclosed in the financial statements
referred to in Section 5.4.

         5.8. Subsidiaries. Schedule 1 contains an accurate list of all
Subsidiaries of the Borrower as of the date of this Agreement, setting forth
their respective jurisdictions of organization and the percentage of their
respective capital stock or other ownership interests owned by the Borrower or
other Subsidiaries. All of the issued and outstanding shares of capital stock or
other ownership interests of such Subsidiaries have been (to the extent such
concepts are relevant with respect to such ownership interests) duly authorized
and issued and are fully paid and non-assessable.

         5.9. ERISA. Neither the Borrower nor any other member of the Controlled
Group has incurred in the aggregate Unfunded Liabilities of all Single Employer
Plans in an amount that could reasonably be expected to have a Material Adverse
Effect. Neither the Borrower nor any

                                      -36-
<PAGE>   44

other member of the Controlled Group has incurred, or is reasonably expected to
incur, any withdrawal liability to Multiemployer Plans in the aggregate in an
amount that could reasonably be expected to have a Material Adverse Effect. Each
Plan complies in all material respects with all applicable requirements of law
and regulations, and no Reportable Event has occurred with respect to any Plan
that could reasonably be expected to have a Material Adverse Effect.

         5.10. Accuracy of Information. No information, exhibit or report
furnished by the Borrower or any of its Subsidiaries to the Administrative Agent
or to any Lender in connection with the negotiation of, or compliance with, the
Loan Documents contained any misstatement of material fact or omitted to state a
material fact necessary to make the statements contained therein not misleading.

         5.11. Regulation U. Margin stock (as defined in Regulation U)
constitutes less than 25% of the value of those assets of the Borrower and its
Subsidiaries which are subject to any limitation on sale, pledge, or other
restriction hereunder.

         5.12. Material Agreements. The Borrower is not a party to any agreement
or instrument or subject to any charter or other corporate restriction which
could reasonably be expected to have a Material Adverse Effect. Neither the
Borrower nor any Subsidiary is in default in the performance, observance or
fulfillment of any of the obligations, covenants or conditions contained in (i)
any agreement to which it is a party, which default could reasonably be expected
to have a Material Adverse Effect or (ii) any agreement or instrument evidencing
or governing Indebtedness which aggregates in excess of $2,500,000.

         5.13. Compliance With Laws. The Borrower and its Subsidiaries have
complied with all applicable statutes, rules, regulations, orders and
restrictions of any domestic or foreign government or any instrumentality or
agency thereof having jurisdiction over the conduct of their respective
businesses or the ownership of their respective Property except for any failure
to comply with any of the foregoing which could not reasonably be expected to
have a Material Adverse Effect.

         5.14. Ownership of Properties. Except as set forth on Schedule 2, on
the date of this Agreement, the Borrower and its Subsidiaries will have good
title, free of all Liens other than those permitted by Section 6.15, to all of
the Property and assets reflected in the Borrower's most recent consolidated
financial statements provided to the Administrative Agent as owned by the
Borrower and its Subsidiaries.

         5.15. Plan Assets; Prohibited Transactions. The Borrower is not an
entity deemed to hold "plan assets" within the meaning of 29 C.F.R. Section
2510.3-101 of an employee benefit plan (as defined in Section 3(3) of ERISA)
which is subject to Title I of ERISA or any plan (within the meaning of Section
4975 of the Code), and neither the execution of this Agreement nor the making of
Credit Extensions hereunder gives rise to a prohibited transaction within the
meaning of Section 406 of ERISA or Section 4975 of the Code.

         5.16. Environmental Matters. In the ordinary course of its business,
the officers of the Borrower consider the effect of Environmental Laws on the
business of the Borrower and its Subsidiaries, in the course of which they
identify and evaluate potential risks and liabilities

                                      -37-
<PAGE>   45

accruing to the Borrower due to Environmental Laws. On the basis of this
consideration, the Borrower has concluded that Environmental Laws cannot
reasonably be expected to have a Material Adverse Effect. Neither the Borrower
nor any Subsidiary has received any notice to the effect that its operations are
not in material compliance with any of the requirements of applicable
Environmental Laws or are the subject of any federal or state investigation
evaluating whether any remedial action is needed to respond to a release of any
toxic or hazardous waste or substance into the environment, which non-compliance
or remedial action could reasonably be expected to have a Material Adverse
Effect.

         5.17. Investment Company Act. Neither the Borrower nor any Subsidiary
is an "investment company" or a company "controlled" by an "investment company",
within the meaning of the Investment Company Act of 1940, as amended.

         5.18. Public Utility Holding Company Act. Neither the Borrower nor any
Subsidiary is a "holding company" or a "subsidiary company" of a "holding
company", or an "affiliate" of a "holding company" or of a "subsidiary company"
of a "holding company", within the meaning of the Public Utility Holding Company
Act of 1935, as amended.

         5.19. Subordinated Indebtedness. The Obligations constitute senior
indebtedness which is entitled to the benefits of the subordination provisions
of all outstanding Subordinated Indebtedness.

         5.20. Post-Retirement Benefits. The present value of the expected cost
of post-retirement medical and insurance benefits payable by the Borrower and
its Subsidiaries to its employees and former employees, as estimated by the
Borrower in accordance with procedures and assumptions reasonably acceptable to
the Required Lenders, does not exceed $2,500,000.

         5.21. Solvency.

                  (i) Immediately after the consummation of the transactions to
         occur on the date hereof and immediately following the making of each
         Credit Extension, if any, made on the date hereof and after giving
         effect to the application of the proceeds of such Credit Extension, (a)
         the fair value of the assets of the Borrower and its Subsidiaries on a
         consolidated basis, at a fair valuation, will exceed the debts and
         liabilities, subordinated, contingent or otherwise, of the Borrower and
         its Subsidiaries on a consolidated basis; (b) the present fair saleable
         value of the Property of the Borrower and its Subsidiaries on a
         consolidated basis will be greater than the amount that will be
         required to pay the probable liability of the Borrower and its
         Subsidiaries on a consolidated basis on their debts and other
         liabilities, subordinated, contingent or otherwise, as such debts and
         other liabilities become absolute and matured; (c) the Borrower and its
         Subsidiaries on a consolidated basis will be able to pay their debts
         and liabilities, subordinated, contingent or otherwise, as such debts
         and liabilities become absolute and matured; and (d) the Borrower and
         its Subsidiaries on a consolidated basis will not have unreasonably
         small capital with which to conduct the businesses in which they are
         engaged as such businesses are now conducted and are proposed to be
         conducted after the date hereof.

                                      -38-
<PAGE>   46

                  (ii) The Borrower does not intend to, or to permit any of its
         Subsidiaries to, and does not believe that it or any of its
         Subsidiaries will, incur debts beyond its ability to pay such debts as
         they mature, taking into account the timing of and amounts of cash to
         be received by it or any such Subsidiary and the timing of the amounts
         of cash to be payable on or in respect of its Indebtedness or the
         Indebtedness of any such Subsidiary.

         5.22. Indenture. The Borrower has made a thorough and complete review
of the Indenture and compliance by RHC with the terms and provisions thereof. No
default, and no event which with the giving of notice or lapse of time or both
would be a default, exists under the Indenture or will result from the
transactions contemplated by this Agreement.

                                   ARTICLE VI

                                    COVENANTS

         During the term of this Agreement, unless the Required Lenders shall
otherwise consent in writing:

         6.1. Financial Reporting. The Borrower will maintain, for itself and
each Subsidiary, a system of accounting established and administered in
accordance with generally accepted accounting principles, and furnish to the
Lenders:

                  (i) Within 120 days after the close of each of its fiscal
         years, an unqualified audit report certified by independent certified
         public accountants acceptable to the Lenders, prepared in accordance
         with Agreement Accounting Principles on a consolidated basis for itself
         and its Subsidiaries, including balance sheets as of the end of such
         period, related profit and loss and reconciliation of surplus
         statements, and a statement of cash flows, accompanied by any
         management letter prepared by said accountants.

                  (ii) Within 60 days after the close of each of the quarterly
         periods of each of its fiscal years, for itself and its Subsidiaries,
         consolidated unaudited balance sheets as at the close of each such
         period and consolidated profit and loss and reconciliation of surplus
         statements and a statement of cash flows for the period from the
         beginning of such fiscal year to the end of such quarter, all certified
         by its chief financial officer.

                  (iii) As soon as available, but in any event within 15 days
         before the beginning of each fiscal year of the Borrower, a copy of the
         plan and forecast (including a projected consolidated balance sheet,
         income statement and funds flow statement) of the Borrower for the
         forthcoming fiscal year.

                  (iv) Together with the financial statements required under
         Sections 6.1(i) and (ii), a compliance certificate in substantially the
         form of Exhibit B signed by its chief financial officer showing the
         calculations necessary to determine compliance with this Agreement and
         stating that no Default or Unmatured Default exists, or if any Default
         or Unmatured Default exists, stating the nature and status thereof.

                                      -39-
<PAGE>   47

                  (v) Within 270 days after the close of each fiscal year, a
         statement of the Unfunded Liabilities of each Single Employer Plan,
         certified as correct by Arthur Andersen LLP or an actuary enrolled
         under ERISA.

                  (vi) As soon as possible and in any event within 10 days after
         the Borrower knows that any Reportable Event that could reasonably be
         expected to have a Material Adverse Effect has occurred with respect to
         any Plan, a statement, signed by the chief financial officer of the
         Borrower, describing said Reportable Event and the action which the
         Borrower proposes to take with respect thereto.

                  (vii) As soon as possible and in any event within 10 days
         after receipt by the Borrower, a copy of (a) any notice or claim to the
         effect that the Borrower or any of its Subsidiaries is or may be liable
         to any Person as a result of the release by the Borrower, any of its
         Subsidiaries, or any other Person of any toxic or hazardous waste or
         substance into the environment, and (b) any notice alleging any
         violation of any federal, state or local environmental, health or
         safety law or regulation by the Borrower or any of its Subsidiaries,
         which, in either case, could reasonably be expected to have a Material
         Adverse Effect.

                  (viii) Promptly upon the furnishing thereof to the
         shareholders of the Borrower, copies of all financial statements,
         reports and proxy statements so furnished.

                  (ix) Promptly upon the filing thereof, copies of all
         registration statements and annual, quarterly, monthly or other regular
         reports which the Borrower or any of its Subsidiaries files with the
         Securities and Exchange Commission.

                  (x) Promptly upon furnishing thereof to the holders of the
         Target Senior Subordinated Notes, copies of all reports, notices, and
         proxy statements so furnished.

                  (xi) Such other information (including non-financial
         information) as the Administrative Agent or any Lender may from time to
         time reasonably request.

         6.2. Use of Proceeds. The Borrower will, and will cause each Subsidiary
to, use the proceeds of the Credit Extensions for general corporate purposes, to
refinance existing indebtedness of the Borrower and its Subsidiaries, and to
finance Acquisitions and Investments permitted under Section 6.14, and capital
expenditures permitted hereunder. The Borrower will not, nor will it permit any
Subsidiary to, use any of the proceeds of the Advances to purchase or carry any
"margin stock" (as defined in Regulation U).

         6.3. Notice of Default. The Borrower will, and will cause each
Subsidiary to, give prompt notice (which notice shall in any event be given
within three (3) Business Days) in writing to the Lenders of the occurrence of
any Default or Unmatured Default and of any other development, financial or
otherwise, which could reasonably be expected to have a Material Adverse Effect.

         6.4. Conduct of Business. The Borrower will, and will cause each
Subsidiary to, carry on and conduct its business in substantially the same
manner and in the construction products or building materials industry as it is
presently conducted and do all things necessary to remain duly

                                      -40-
<PAGE>   48

incorporated or organized, validly existing and (to the extent such concept
applies to such entity) in good standing as a domestic corporation, partnership
or limited liability company in its jurisdiction of incorporation or
organization, as the case may be, and maintain all requisite authority to
conduct its business in each jurisdiction in which its business is conducted
except where failure to maintain such authority could not individually or in the
aggregate reasonably be expected to have a Material Adverse Effect.

         6.5. Taxes. The Borrower will, and will cause each Subsidiary to,
timely file complete and correct United States federal and applicable foreign,
state and local tax returns required by law and pay when due all taxes,
assessments and governmental charges and levies upon it or its income, profits
or Property, except (i) those which are being contested in good faith by
appropriate proceedings and with respect to which adequate reserves have been
set aside in accordance with Agreement Accounting Principles or (ii) where
failure to file or pay could not individually or in the aggregate reasonably be
expected to have a Material Adverse Effect. At any time that any Subsidiary of
the Borrower is organized as a limited liability company, each such limited
liability company will qualify for partnership tax treatment under United States
federal tax law.

         6.6. Insurance. The Borrower will, and will cause each Subsidiary to,
maintain with financially sound and reputable insurance companies insurance on
all their Property in such amounts and covering such risks as is consistent with
sound business practice, and the Borrower will furnish to any Lender upon
request full information as to the insurance carried.

         6.7. Compliance with Laws. The Borrower will, and will cause each
Subsidiary to, comply with all laws, rules, regulations, orders, writs,
judgments, injunctions, decrees or awards to which it may be subject including,
without limitation, all Environmental Laws other than such noncompliance which
could not individually or in the aggregate reasonably be expected to have a
Material Adverse Effect.

         6.8. Maintenance of Properties. The Borrower will, and will cause each
Subsidiary to, do all things necessary to maintain, preserve, protect and keep
its Property in good repair, working order and condition, and make all necessary
and proper repairs, renewals and replacements so that its business carried on in
connection therewith may be properly conducted at all times except where such
failure could not individually or in the aggregate reasonably be expected to
have a Material Adverse Effect.

         6.9. Inspection. The Borrower will, and will cause each Subsidiary to,
permit the Administrative Agent and the Lenders, by their respective
representatives and agents, to inspect any of the Property, books and financial
records of the Borrower and each Subsidiary, to examine and make copies of the
books of accounts and other financial records of the Borrower and each
Subsidiary, and to discuss the affairs, finances and accounts of the Borrower
and each Subsidiary with, and to be advised as to the same by, their respective
officers at such reasonable times and intervals as the Administrative Agent or
any Lender may designate.

         6.10. Dividends. The Borrower will not, nor will it permit any
Subsidiary to, declare or pay any dividends or make any distributions on its
capital stock (other than dividends payable in its own capital stock) or redeem,
repurchase or otherwise acquire or retire any of its capital stock

                                      -41-
<PAGE>   49

at any time outstanding, except that (i) any Subsidiary may declare and pay
dividends or make distributions to the Borrower or to a Wholly-Owned Subsidiary
and (ii) when no Default exists or will result therefrom, the Borrower may pay
dividends on its capital stock during each fiscal year in an amount not to
exceed in the aggregate $5,000,000.

         6.11. Indebtedness. The Borrower will not, nor will it permit any
Subsidiary to, create, incur or suffer to exist any Indebtedness, except:

                  (i) The Loans and the Reimbursement Obligations.

                  (ii) Indebtedness existing as of November 10, 2000 and
         described in Schedule 2.

                  (iii) Indebtedness arising under Rate Management Obligations
         having a Net Mark-to-Market Exposure not exceeding $15,000,000.

                  (iv) Indebtedness arising in connection with transactions
         permitted by Section 6.13(iii).

                  (v) Indebtedness arising in connection with the sale or
         transfer of an interest in trade receivables of the Borrower or any
         Subsidiary on a limited recourse basis not exceeding in the aggregate
         $100,000,000 at any one time outstanding.

                  (vi) With respect to RHC only, the Target Senior Subordinated
         Notes.

                  (vii) Annual payments under Operating Leases not to exceed in
         the aggregate $5,000,000 during any fiscal year.

                  (viii) Indebtedness in addition to that specifically described
         in clauses (i) through (vii) of this Section 6.11 incurred when no
         Default exists or will result therefrom which in the aggregate does not
         exceed $15,000,000 at any time outstanding.

                  (ix) So long as no Default has occurred and is continuing or
         would result therefrom, Indebtedness representing intercompany advances
         or payables permitted under Section 6.14(iv)

                  (x) So long as no Default has occurred and is continuing or
         would result therefrom, any guarantee by Borrower or its Subsidiaries
         of Indebtedness of a Subsidiary otherwise permitted under this Section
         6.11.

         6.12. Merger. The Borrower will not, nor will it permit any Subsidiary
to, merge or consolidate with or into any other Person, except (i) that a
Subsidiary may merge into the Borrower or a Subsidiary (subject to compliance
with Section 6.25) and (ii) in connection with Permitted Acquisitions.

         6.13. Sale of Assets. The Borrower will not, nor will it permit any
Subsidiary to, lease, sell or otherwise dispose of its Property to any other
Person, except:

                                      -42-
<PAGE>   50

                  (i) Sales of inventory in the ordinary course of business.

                  (ii) Leases, sales or other dispositions of its Property that,
         together with all other Property of the Borrower and its Subsidiaries
         previously leased, sold or disposed of (other than inventory in the
         ordinary course of business) as permitted by this Section during the
         twelve-month period ending with the month in which any such lease, sale
         or other disposition occurs, do not constitute a Substantial Portion of
         the Property of the Borrower and its Subsidiaries.

                  (iii) Any transfer of an interest in accounts or notes
         receivable on a limited recourse basis, provided that such transfer
         qualifies as a sale under Agreement Accounting Principles and that the
         amount of any related financing does not exceed $100,000,000 at any one
         time outstanding as permitted pursuant to Section 6.11(v).

         6.14. Investments and Acquisitions. The Borrower will not, nor will it
permit any Subsidiary to, make or suffer to exist any Investments (including
without limitation, loans and advances to, and other Investments in,
Subsidiaries), or commitments therefor, or to create any Subsidiary or to become
or remain a partner in any partnership or joint venture, or to make any
Acquisition of any Person, except:

                  (i) Cash Equivalent Investments.

                  (ii) Existing Investments in Subsidiaries and other
         Investments in existence on the date hereof and described in Schedule
         1.

                  (iii) Permitted Acquisitions.

                  (iv) Other Investments in Subsidiaries (subject to compliance
         with Section 6.25).

                  (v) Investments comprised of instruments received in
         connection with the workout or other restructure in the ordinary course
         of business of amounts payable to Borrower or a Subsidiary.

         6.15. Liens. The Borrower will not, nor will it permit any Subsidiary
to, create, incur, or suffer to exist any Lien in, of or on the Property of the
Borrower or any of its Subsidiaries, except:

                  (i) Liens for taxes, assessments or governmental charges or
         levies on its Property if the same shall not at the time be delinquent
         or thereafter can be paid without penalty, or are being contested in
         good faith and by appropriate proceedings and for which adequate
         reserves in accordance with Agreement Accounting Principles shall have
         been set aside on its books.

                  (ii) Liens imposed by law, such as carriers', landlords',
         warehousemen's and mechanics' liens and other similar liens arising in
         the ordinary course of business which secure payment of obligations not
         more than 60 days past due or which are being

                                      -43-
<PAGE>   51

         contested in good faith by appropriate proceedings and for which
         adequate reserves shall have been set aside on its books.

                  (iii) Liens arising out of pledges or deposits under worker's
         compensation laws, unemployment insurance, old age pensions, or other
         social security or retirement benefits, or similar legislation.

                  (iv) Utility easements, building restrictions and such other
         encumbrances or charges against real property as are of a nature
         generally existing with respect to properties of a similar character
         and which do not in any material way affect the marketability of the
         same or interfere with the use thereof in the business of the Borrower
         or its Subsidiaries.

                  (v) Liens existing on the date hereof and described in
         Schedule 2.

                  (vi) Liens incurred in connection with any transfer of an
         interest in accounts or notes receivable which is permitted pursuant to
         Section 6.13(iii), and which Liens attach solely to the trade
         receivables sold or transferred in connection with the incurrence of
         Indebtedness permitted by Section 6.11(v).

                  (vii) Liens securing Indebtedness permitted to be incurred
         under Section 6.11 which attach solely to the assets purchased with the
         proceeds of such Indebtedness.

         6.16. Capital Expenditures. The Borrower will not, nor will it permit
any Subsidiary to, expend, or be committed to expend, in excess of $50,000,000
for Capital Expenditures during any one fiscal year on a non-cumulative basis in
the aggregate for the Borrower and its Subsidiaries.

         6.17. Affiliates. The Borrower will not, and will not permit any
Subsidiary to, enter into any transaction (including, without limitation, the
purchase or sale of any Property or service) with, or make any payment or
transfer to, any Affiliate except (i) in the ordinary course of business and
pursuant to the reasonable requirements of the Borrower's or such Subsidiary's
business and upon fair and reasonable terms no less favorable to the Borrower or
such Subsidiary than the Borrower or such Subsidiary would obtain in a
comparable arms-length transaction, (ii) transactions among the Borrower and its
Subsidiaries and (iii) immaterial transactions existing as of the date hereof.

         6.18. Sale and Leaseback Transactions and other Off-Balance Sheet
Liabilities. The Borrower will not, nor will it permit any Subsidiary to, enter
into or suffer to exist any (i) Sale and Leaseback Transaction or (ii) any other
transaction pursuant to which it incurs or has incurred Off-Balance Sheet
Liabilities, except for Rate Management Obligations permitted to be incurred
under the terms of Section 6.11(iii) or a transaction permitted under Section
6.13(iii).

         6.19. Contingent Obligations. The Borrower will not, nor will it permit
any Subsidiary to, make or suffer to exist any Contingent Obligation (including,
without limitation, any Contingent Obligation with respect to the obligations of
a Subsidiary who is not a Guarantor), except (i) by endorsement of instruments
for deposit or collection in the ordinary course of business, (ii) the
Reimbursement Obligations, (iii) the Guaranty, (iv) as permitted by

                                      -44-
<PAGE>   52

Section 6.11(viii) or 6.11(x) and (v) Contingent Obligations which constitute
obligations existing as of the date hereof of any Borrower or any Subsidiary as
a general partner of a partnership with respect to the liabilities of such
partnership.

         6.20. Letters of Credit. The Borrower will not, nor will it permit any
Subsidiary to, apply for or become liable upon or in respect of any Letter of
Credit other than Facility LCs.

         6.21. Financial Contracts. The Borrower will not, nor will it permit
any Subsidiary to, enter into or remain liable upon any Financial Contract,
except Rate Management Obligations permitted under Section 6.11(iii).

         6.22. Financial Covenants.

                  6.22.1 Interest Coverage Ratio. Beginning with the fiscal
         quarter ending June 30, 2001, the Borrower will not permit the ratio,
         determined as of the end of each of its fiscal quarters for the then
         most-recently ended four fiscal quarters, of (i) Consolidated EBIT to
         (ii) Consolidated Interest Expense to be less than 2.50 to 1.00;
         provided, however, the Borrower will not permit such ratio, determined
         for the then most-recently ended four fiscal quarters, to be less than
         2.00 to 1.00 for the fiscal quarters ending March 31, 2002 and March
         31, 2003.

                  6.22.2 Leverage Ratio. The Borrower will not permit the ratio,
         determined as of the end of each of its fiscal quarters, of (i)
         Consolidated Funded Indebtedness to (ii) Consolidated EBITDA for the
         then most-recently ended four fiscal quarters to be greater than (a)
         3.50 to 1.00 beginning with the fiscal quarter ending on June 30, 2001
         through the fiscal quarter ending on March 31, 2002, (b) 3.25 to 1.00
         beginning with the fiscal quarter ending on June 30, 2002 through the
         fiscal quarter ending on September 30, 2002 and (c) 3.00 to 1.00
         beginning with the fiscal quarter ending on December 31, 2002 and
         thereafter.

                  6.22.3 Minimum Tangible Net Worth. As of December 31, 2000,
         the Borrower will at all times maintain Consolidated Tangible Net Worth
         of not less than $325,000,000 and for the last day of each fiscal
         quarter thereafter, not less than the sum of (i) the minimum
         Consolidated Tangible Net Worth required for the prior fiscal quarter,
         plus (ii) 50% of the Consolidated Net Income (not less than $0.00) for
         the fiscal quarter then ended, plus (iii) 100% of the Net Cash Proceeds
         of any equity issuances (excluding issuances described in clause (a) of
         the first sentence of Section 2.25 and issuances solely to finance
         Permitted Acquisitions) by the Borrower or any Subsidiary for the
         fiscal quarter then ended.

         6.23. Lines of Business. The Borrower will not, nor will it permit any
Subsidiary to, engage in any line or lines of business activity other than the
businesses in which they are engaged on the date hereof or lines of business
complementary or reasonably related to the construction products or building
materials industry.

         6.24. Prepayment of Debt. When a Default has occurred and is continuing
or will result therefrom, the Borrower will not, and will not permit any
Subsidiary to, prepay any Indebtedness, except the Obligations.

                                      -45-
<PAGE>   53

         6.25. Future Subsidiaries. The Borrower shall cause each Person that
becomes a Significant Subsidiary after the date of the initial Credit Extension
to promptly execute such documents, instruments, and agreements as the
Administrative Agent deems necessary or appropriate, in form and substance
satisfactory to the Administrative Agent, to cause such Subsidiary to become a
guarantor of the Obligations on a basis substantially the same as the existing
Guarantors.

         6.26. Prohibition on Granting Negative Pledges. Except for this
Agreement and Liens permitted by Section 6.15 to the extent such Liens encumber
only the assets so financed, the Borrower will not and will not permit any
Subsidiary to enter into or become bound by any agreement, understanding or
arrangement (other than this Agreement) that limits, restricts or impairs in any
way the right of any of such Person to create, assume or suffer to exist any
Lien on any of such Person's Properties or assets in favor of the Administrative
Agent (or any successor Administrative Agent) for the benefit of the Lenders.

         6.27. Prohibition on Granting Restrictions on Distributions. Except for
this Agreement, the Borrower will not enter into or become bound by any
agreement, arrangement or understanding or permit its Subsidiaries to do so
(including, without limitation, their respective articles of incorporation,
bylaws or other charter documents) that limits, restricts, subordinates or
impairs in any way the right or ability of any of the Subsidiaries to make
dividends or distributions to or Investments in the Borrower or to repay any
Indebtedness or obligation owed to the Borrower.

         6.28. Prohibition on Synthetic Leases. Borrower will not at any time
become or be obligated as lessee or borrower under any Synthetic Lease nor will
it permit any Subsidiary to do so.

         6.29. Amendments to Indebtedness. The Borrower will not, and will not
permit any Subsidiary to, make any amendment or modification to the Indenture
(as amended as described in the definition of Target Senior Subordinated Notes)
or any indenture, note or other agreement evidencing or governing any
Subordinated Indebtedness or the Indebtedness owed by the Borrower or its
Subsidiaries to Borrower or its other Subsidiaries, or directly or indirectly
voluntarily prepay, defease or in substance defease, purchase, redeem, retire or
otherwise acquire, any Subordinated Indebtedness or the Indebtedness owed by
Borrower or its Subsidiaries to the Borrower or its other Subsidiaries, other
than prepayment of the Target Senior Subordinated Notes permitted by Section
6.24 and so long as no Default has occurred and is continuing or would result
therefrom, the payment of intercompany Indebtedness.

         6.30. [Intentionally Deleted.]

         6.31. Target Senior Subordinated Notes. The Borrower will not permit
RHC nor any of RHC's Subsidiaries to incur any Indebtedness nor take any other
action which could reasonably be expected to cause a default under the Target
Senior Subordinated Notes.

                                      -46-
<PAGE>   54

                                  ARTICLE VII

                                    DEFAULTS

         The occurrence of any one or more of the following events shall
constitute a Default:

         7.1. Any representation or warranty made or deemed made by or on behalf
of the Borrower or any of its Subsidiaries to the Lenders or the Administrative
Agent under or in connection with this Agreement, any Credit Extension, or any
certificate or information delivered in connection with this Agreement or any
other Loan Document shall be materially false on the date as of which made.

         7.2. Nonpayment of principal of any Loan when due, nonpayment of any
Reimbursement Obligation within one Business Day after the same becomes due, or
nonpayment of interest upon any Loan or of any commitment fee, LC Fee or other
obligations under any of the Loan Documents within five days after the same
becomes due.

         7.3. The breach by the Borrower of any of the terms or provisions of
Section 6.1, 6.2, 6.10, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16, 6.18, 6.19, 6.20,
6.21, 6.22, 6.23, 6.24, 6.25, 6.26, 6.27, 6.28, or 6.29.

         7.4. The breach by the Borrower (other than a breach which constitutes
a Default under another Section of this Article VII) of any of the terms or
provisions of this Agreement which is not remedied within 15 days after written
notice from the Administrative Agent or any Lender.

         7.5. Failure of the Borrower or any of its Subsidiaries to pay when due
(beyond the applicable grace period with respect thereto, if any) any
Indebtedness aggregating in excess of $2,500,000 ("Material Indebtedness"); or
the default by the Borrower or any of its Subsidiaries in the performance
(beyond the applicable grace period with respect thereto, if any) of any term,
provision or condition contained in any agreement under which any such Material
Indebtedness was created or is governed, or any other event shall occur or
condition exist, the effect of which default or event is to cause, or to permit
the holder or holders of such Material Indebtedness to cause, such Material
Indebtedness to become due prior to its stated maturity; or any Material
Indebtedness of the Borrower or any of its Subsidiaries shall be declared to be
due and payable or required to be prepaid or repurchased (other than by a
regularly scheduled payment) prior to the stated maturity thereof; or the
Borrower or any of its Subsidiaries shall not pay, or admit in writing its
inability to pay, its debts generally as they become due.

         7.6. The Borrower or any of its Subsidiaries shall (i) have an order
for relief entered with respect to it under the Federal bankruptcy laws as now
or hereafter in effect, (ii) make an assignment for the benefit of creditors,
(iii) apply for, seek, consent to, or acquiesce in, the appointment of a
receiver, custodian, trustee, examiner, liquidator or similar official for it or
any Substantial Portion of its Property, (iv) institute any proceeding seeking
an order for relief under the Federal bankruptcy laws as now or hereafter in
effect or seeking to adjudicate it a bankrupt or insolvent, or seeking
dissolution, winding up, liquidation, reorganization, arrangement, adjustment or
composition of it or its debts under any law relating to bankruptcy, insolvency
or

                                      -47-
<PAGE>   55

reorganization or relief of debtors or fail to file an answer or other pleading
denying the material allegations of any such proceeding filed against it, (v)
take any corporate or partnership action to authorize or effect any of the
foregoing actions set forth in this Section 7.6 or (vi) fail to contest in good
faith any appointment or proceeding described in Section 7.7.

         7.7. Without the application, approval or consent of the Borrower or
any of its Subsidiaries, a receiver, trustee, examiner, liquidator or similar
official shall be appointed for the Borrower or any of its Subsidiaries or any
Substantial Portion of its Property, or a proceeding described in Section
7.6(iv) shall be instituted against the Borrower or any of its Subsidiaries and
such appointment continues undischarged or such proceeding continues undismissed
or unstayed for a period of 60 consecutive days.

         7.8. Any court, government or governmental agency shall condemn, seize
or otherwise appropriate, or take custody or control of, all or any portion of
the Property of the Borrower or any Subsidiary which, when taken together with
all other Property of the Borrower or such Subsidiary so condemned, seized,
appropriated, or taken custody or control of, during the twelve-month period
ending with the month in which any such action occurs, constitutes a Substantial
Portion.

         7.9. The Borrower or any of its Subsidiaries shall fail within 60 days
to pay, bond or otherwise discharge one or more (i) judgments or orders for the
payment of money in excess of $2,500,000 (or the equivalent thereof in
currencies other than U.S. Dollars) in the aggregate, or (ii) nonmonetary
judgments or orders which, individually or in the aggregate, could reasonably be
expected to have a Material Adverse Effect, which judgment(s), in any such case,
is/are not stayed on appeal or otherwise being appropriately contested in good
faith.

         7.10. The Borrower or any member of the Controlled Group has incurred
in the aggregate Unfunded Liabilities of all Single Employer Plans by an amount
which could reasonably be expected to have a Material Adverse Effect or any
Reportable Event shall occur in connection with any Plan which could reasonably
be expected to have a Material Adverse Effect.

         7.11. The Borrower or any other member of the Controlled Group shall
have been notified by the sponsor of a Multiemployer Plan that it has incurred
withdrawal liability to such Multiemployer Plan in an amount which, when
aggregated with all other amounts required to be paid to Multiemployer Plans by
the Borrower or any other member of the Controlled Group as withdrawal liability
(determined as of the date of such notification), could reasonably be expected
to have a Material Adverse Effect.

         7.12. The Borrower or any other member of the Controlled Group shall
have been notified by the sponsor of a Multiemployer Plan that such
Multiemployer Plan is in reorganization or is being terminated, within the
meaning of Title IV of ERISA, if as a result of such reorganization or
termination the aggregate annual contributions of the Borrower and the other
members of the Controlled Group (taken as a whole) to all Multiemployer Plans
which are then in reorganization or being terminated have been or will be
increased over the amounts contributed to such Multiemployer Plans for the
respective plan years of each such Multiemployer Plan immediately preceding the
plan year in which the reorganization or

                                      -48-
<PAGE>   56

termination occurs by an amount which could reasonably be expected to have a
Material Adverse Effect.

         7.13. The Borrower or any of its Subsidiaries shall (i) be the subject
of any proceeding or investigation pertaining to the release by the Borrower,
any of its Subsidiaries or any other Person of any toxic or hazardous waste or
substance into the environment, or (ii) violate any Environmental Law, which, in
the case of an event described in clause (i) or clause (ii), could reasonably be
expected to have a Material Adverse Effect.

         7.14. Any Change in Control shall occur.

         7.15. Any Guaranty shall fail to remain in full force or effect or any
action shall be taken to discontinue or to assert the invalidity or
unenforceability of any Guaranty, or any Guarantor shall fail to comply with any
of the terms or provisions of any Guaranty to which it is a party, or any
Guarantor shall deny that it has any further liability under any Guaranty to
which it is a party, or shall give notice to such effect.

         7.16. The representations and warranties set forth in Section 5.15
("Plan Assets; Prohibited Transactions") shall at any time not be true and
correct.

                                  ARTICLE VIII

                 ACCELERATION, WAIVERS, AMENDMENTS AND REMEDIES

         8.1. Acceleration; Facility LC Collateral Account.

                  (i) If any Default described in Section 7.6 or 7.7 occurs, the
         obligations of the Lenders to make Loans hereunder and the obligation
         and power of the LC Issuer to issue Facility LCs shall automatically
         terminate and the Obligations shall immediately become due and payable
         without any election or action on the part of the Administrative Agent,
         the LC Issuer or any Lender and the Borrower will be and become thereby
         unconditionally obligated, without any further notice, act or demand,
         to pay to the Administrative Agent an amount in immediately available
         funds, which funds shall be held in the Facility LC Collateral Account,
         equal to the difference of (x) the amount of LC Obligations at such
         time, less (y) the amount on deposit in the Facility LC Collateral
         Account at such time which is free and clear of all rights and claims
         of third parties and has not been applied against the Obligations (such
         difference, the "Collateral Shortfall Amount"). If any other Default
         occurs, the Required Lenders (or the Administrative Agent with the
         consent of the Required Lenders) may (a) terminate or suspend the
         obligations of the Lenders to make Loans hereunder and the obligation
         and power of the LC Issuer to issue Facility LCs, or declare the
         Obligations to be due and payable, or both, whereupon the Obligations
         shall become immediately due and payable, without presentment, demand,
         protest or notice of any kind, all of which the Borrower hereby
         expressly waives, and (b) upon notice to the Borrower and in addition
         to the continuing right to demand payment of all amounts payable under
         this Agreement, make demand on the Borrower to pay, and the Borrower
         will, forthwith upon such demand and without any

                                      -49-
<PAGE>   57

         further notice or act, pay to the Administrative Agent the Collateral
         Shortfall Amount, which funds shall be deposited in the Facility LC
         Collateral Account.

                  (ii) If at any time while any Default is continuing, the
         Administrative Agent determines that the Collateral Shortfall Amount at
         such time is greater than zero, the Administrative Agent may make
         demand on the Borrower to pay, and the Borrower will, forthwith upon
         such demand and without any further notice or act, pay to the
         Administrative Agent the Collateral Shortfall Amount, which funds shall
         be deposited in the Facility LC Collateral Account.

                  (iii) The Administrative Agent may at any time or from time to
         time after funds are deposited in the Facility LC Collateral Account,
         apply such funds to the payment of the Obligations and any other
         amounts as shall from time to time have become due and payable by the
         Borrower to the Lenders or the LC Issuer under the Loan Documents.

                  (iv) At any time while any Default is continuing, neither the
         Borrower nor any Person claiming on behalf of or through the Borrower
         shall have any right to withdraw any of the funds held in the Facility
         LC Collateral Account. After all of the Obligations have been
         indefeasibly paid in full and the Aggregate Commitment has been
         terminated, any funds remaining in the Facility LC Collateral Account
         shall be returned by the Administrative Agent to the Borrower or paid
         to whomever may be legally entitled thereto at such time.

                  (v) If, within 30 days after acceleration of the maturity of
         the Obligations or termination of the obligations of the Lenders to
         make Loans and the obligation and power of the LC Issuer to issue
         Facility LCs hereunder as a result of any Default (other than any
         Default as described in Section 7.6 or 7.7) and before any judgment or
         decree for the payment of the Obligations due shall have been obtained
         or entered, the Required Lenders (in their sole discretion) shall so
         direct, the Administrative Agent shall, by notice to the Borrower,
         rescind and annul such acceleration and/or termination.

         8.2. Amendments. Subject to the provisions of this Article VIII, the
Required Lenders (or the Administrative Agent with the consent in writing of the
Required Lenders) and the Borrower may enter into agreements supplemental hereto
for the purpose of adding or modifying any provisions to the Loan Documents or
changing in any manner the rights of the Lenders or the Borrower hereunder or
waiving any Default hereunder; provided, however, that no such supplemental
agreement shall, without the consent of all of the Lenders:

                  (i) Extend the final maturity of any Loan, or extend the
         expiry date of any Facility LC to a date after the Facility Termination
         Date or postpone any regularly scheduled payment of principal of any
         Loan or forgive all or any portion of the principal amount thereof or
         any Reimbursement Obligation related thereto, or reduce the rate or the
         unused fee due under Section 2.5 or extend the time of payment of
         interest or fees thereon or Reimbursement Obligations related thereto.

                  (ii) Reduce the percentage specified in the definition of
         Required Lenders.

                                      -50-
<PAGE>   58

                  (iii) Extend the Facility Termination Date, or reduce the
         amount or extend the payment date for, the mandatory payments required
         under Section 2.2, or increase the amount of the Aggregate Commitment,
         the Commitment of any Lender hereunder or the commitment to issue
         Facility LCs, or permit the Borrower to assign its rights under this
         Agreement.

                  (iv) Amend this Section 8.2.

                  (v) Release any Guarantor except where the sale of all or
         substantially all of the assets or equity interests in a Guarantor is
         otherwise permitted hereunder, in which event the Administrative Agent
         shall execute and deliver to Borrower such release upon such sale.

No amendment of any provision of this Agreement relating to the Administrative
Agent shall be effective without the written consent of the Administrative
Agent, and no amendment of any provision relating to the LC Issuer shall be
effective without the written consent of the LC Issuer. The Administrative Agent
may waive payment of the fee required under Section 12.3.2 without obtaining the
consent of any other party to this Agreement.

         8.3. Preservation of Rights. No delay or omission of the Lenders, the
LC Issuer or the Administrative Agent to exercise any right under the Loan
Documents shall impair such right or be construed to be a waiver of any Default
or an acquiescence therein, and the making of a Credit Extension notwithstanding
the existence of a Default or the inability of the Borrower to satisfy the
conditions precedent to such Credit Extension shall not constitute any waiver or
acquiescence. Any single or partial exercise of any such right shall not
preclude other or further exercise thereof or the exercise of any other right,
and no waiver, amendment or other variation of the terms, conditions or
provisions of the Loan Documents whatsoever shall be valid unless in writing
signed by the Lenders required pursuant to Section 8.2, and then only to the
extent in such writing specifically set forth. All remedies contained in the
Loan Documents or by law afforded shall be cumulative and all shall be available
to the Administrative Agent, the LC Issuer and the Lenders until the Obligations
have been paid in full.

                                   ARTICLE IX

                               GENERAL PROVISIONS

         9.1. Survival of Representations. All representations and warranties of
the Borrower contained in this Agreement shall survive the making of the Credit
Extensions herein contemplated.

         9.2. Governmental Regulation. Anything contained in this Agreement to
the contrary notwithstanding, neither the LC Issuer nor any Lender shall be
obligated to extend credit to the Borrower in violation of any limitation or
prohibition provided by any applicable statute or regulation.

                                      -51-
<PAGE>   59

         9.3. Headings. Section headings in the Loan Documents are for
convenience of reference only, and shall not govern the interpretation of any of
the provisions of the Loan Documents.

         9.4. ENTIRE AGREEMENT. THE LOAN DOCUMENTS EMBODY THE ENTIRE AGREEMENT
AND UNDERSTANDING AMONG THE BORROWER, THE ADMINISTRATIVE AGENT, THE LC ISSUER
AND THE LENDERS AND SUPERSEDE ALL PRIOR AGREEMENTS AND UNDERSTANDINGS AMONG THE
BORROWER, THE ADMINISTRATIVE AGENT, THE LC ISSUER AND THE LENDERS RELATING TO
THE SUBJECT MATTER THEREOF OTHER THAN THE FEE LETTER DESCRIBED IN SECTION 10.13.
THE LOAN DOCUMENTS MAY NOT BE CONTRADICTED OR VARIED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OR DISCUSSIONS OF THE PARTIES
HERETO. THERE ARE NO ORAL AGREEMENTS AMONG THE PARTIES HERETO.

         9.5. Several Obligations; Benefits of this Agreement. The respective
obligations of the Lenders hereunder are several and not joint and no Lender
shall be the partner or agent of any other (except to the extent to which the
Administrative Agent is authorized to act as such). The failure of any Lender to
perform any of its obligations hereunder shall not relieve any other Lender from
any of its obligations hereunder. This Agreement shall not be construed so as to
confer any right or benefit upon any Person other than the parties to this
Agreement and their respective successors and assigns, provided, however, that
the parties hereto expressly agree that the Arranger shall enjoy the benefits of
the provisions of Sections 9.6, 9.10 and 10.11 to the extent specifically set
forth therein and shall have the right to enforce such provisions on its own
behalf and in its own name to the same extent as if it were a party to this
Agreement.

         9.6. Expenses; Indemnification.

                  (i) The Borrower shall reimburse the Administrative Agent and
         the Arranger for any costs, internal charges for fees and time charges
         of attorneys who are employees of the Administrative Agent, the
         Arranger, the LC Issuer and out-of-pocket expenses (including
         attorneys' fees and time charges of attorneys for the Administrative
         Agent) paid or incurred by the Administrative Agent or the Arranger in
         connection with the preparation, negotiation, execution, delivery,
         syndication, review, amendment, modification, and administration of the
         Loan Documents. The Borrower also agrees to reimburse the
         Administrative Agent, the Arranger, the LC Issuer and the Lenders for
         any costs, internal charges for fees and time charges of attorneys who
         are employees of the Administrative Agent, the Arranger, the LC Issuer,
         the Lenders and out-of-pocket expenses (including attorneys' fees and
         time charges of attorneys for the Administrative Agent, the Arranger,
         the LC Issuer and the Lenders) paid or incurred by the Administrative
         Agent, the Arranger, the LC Issuer or any Lender in connection with the
         collection and enforcement of the Loan Documents. Expenses being
         reimbursed by the Borrower under this Section include, without
         limitation, costs and expenses incurred in connection with the Reports
         described in the following sentence. The Borrower acknowledges that
         from time to time Bank One may prepare and may distribute to the
         Lenders (but shall have no obligation or duty to prepare or to
         distribute to the Lenders) certain audit reports (the "Reports")
         pertaining to the Borrower's assets for internal use by

                                      -52-
<PAGE>   60

         Bank One from information furnished to it by or on behalf of the
         Borrower, after Bank One has exercised its rights of inspection
         pursuant to this Agreement.

                  (ii) THE BORROWER HEREBY FURTHER AGREES TO INDEMNIFY THE
         ADMINISTRATIVE AGENT, THE ARRANGER, THE LC ISSUER AND EACH LENDER, ITS
         DIRECTORS, OFFICERS AND EMPLOYEES AGAINST ALL LOSSES, CLAIMS, DAMAGES,
         PENALTIES, JUDGMENTS, LIABILITIES AND EXPENSES (INCLUDING, WITHOUT
         LIMITATION, ALL EXPENSES OF LITIGATION OR PREPARATION THEREFOR WHETHER
         OR NOT THE ADMINISTRATIVE AGENT, THE ARRANGER, THE LC ISSUER OR ANY
         LENDER IS A PARTY THERETO) WHICH ANY OF THEM MAY PAY OR INCUR ARISING
         OUT OF OR RELATING TO THIS AGREEMENT, THE OTHER LOAN DOCUMENTS, THE
         TRANSACTIONS CONTEMPLATED HEREBY OR THE DIRECT OR INDIRECT APPLICATION
         OR PROPOSED APPLICATION OF THE PROCEEDS OF ANY CREDIT EXTENSION
         HEREUNDER EXCEPT TO THE EXTENT THAT THEY ARE DETERMINED IN A FINAL
         NON-APPEALABLE JUDGMENT BY A COURT OF COMPETENT JURISDICTION TO HAVE
         RESULTED FROM THE GROSS NEGLIGENCE, BAD FAITH OR WILLFUL MISCONDUCT OF
         THE PARTY SEEKING INDEMNIFICATION; PROVIDED HOWEVER, THAT IN NO EVENT
         SHALL THE BORROWER BE LIABLE UNDER THIS SECTION 9.6 FOR ANY LOST
         PROFITS OR FOR ANY SPECIAL, INDIRECT, CONSEQUENTIAL OR PUNITIVE
         DAMAGES. THE OBLIGATIONS OF THE BORROWER UNDER THIS SECTION 9.6 SHALL
         SURVIVE THE TERMINATION OF THIS AGREEMENT.

         9.7. Numbers of Documents. All statements, notices, closing documents,
and requests hereunder shall be furnished to the Administrative Agent with
sufficient counterparts so that the Administrative Agent may furnish one to each
of the Lenders.

         9.8. Accounting. Except as provided to the contrary herein, all
accounting terms used herein shall be interpreted and all accounting
determinations hereunder shall be made in accordance with Agreement Accounting
Principles.

         9.9. Severability of Provisions. Any provision in any Loan Document
that is held to be inoperative, unenforceable, or invalid in any jurisdiction
shall, as to that jurisdiction, be inoperative, unenforceable, or invalid
without affecting the remaining provisions in that jurisdiction or the
operation, enforceability, or validity of that provision in any other
jurisdiction, and to this end the provisions of all Loan Documents are declared
to be severable.

         9.10. Nonliability of Lenders. The relationship between the Borrower on
the one hand and the Lenders, the LC Issuer and the Administrative Agent on the
other hand shall be solely that of borrower and lender. Neither the
Administrative Agent, the Arranger, the LC Issuer nor any Lender shall have any
fiduciary responsibilities to the Borrower. Neither the Administrative Agent,
the Arranger, the LC Issuer nor any Lender undertakes any responsibility to the
Borrower to review or inform the Borrower of any matter in connection with any
phase of the Borrower's business or operations. The Borrower agrees that neither
the Administrative Agent, the Arranger, the LC Issuer nor any Lender shall have
liability to the Borrower (whether sounding in

                                      -53-
<PAGE>   61

tort, contract or otherwise) for losses suffered by the Borrower in connection
with, arising out of, or in any way related to, the transactions contemplated
and the relationship established by the Loan Documents, or any act, omission or
event occurring in connection therewith, unless it is determined in a final
non-appealable judgment by a court of competent jurisdiction that such losses
resulted from the gross negligence, bad faith or willful misconduct of the party
from which recovery is sought. Neither the Administrative Agent, the Arranger,
the LC Issuer nor any Lender shall have any liability with respect to, and the
Borrower hereby waives, releases and agrees not to sue for, any special,
indirect or consequential damages suffered by the Borrower in connection with,
arising out of, or in any way related to the Loan Documents or the transactions
contemplated thereby.

         9.11. Confidentiality. Each Lender agrees to hold any confidential
information which it may receive from the Borrower pursuant to this Agreement in
confidence, except for disclosure (i) to its Affiliates and to other Lenders and
their respective Affiliates, (ii) to legal counsel, accountants, and other
professional advisors to such Lender or to a Transferee, (iii) to regulatory
officials, (iv) to any Person as requested pursuant to or as required by law,
regulation, or legal process, (v) to any Person in connection with any legal
proceeding to which such Lender is a party, (vi) to such Lender's direct or
indirect contractual counterparties in swap agreements or to legal counsel,
accountants and other professional advisors to such counterparties, and (vii)
permitted by Section 12.4.

         9.12. Nonreliance. Each Lender hereby represents that it is not relying
on or looking to any margin stock (as defined in Regulation U of the Board of
Governors of the Federal Reserve System) for the repayment of the Credit
Extensions provided for herein.

         9.13. Disclosure. The Borrower and each Lender hereby acknowledge and
agree that Bank One and/or its Affiliates from time to time may hold investments
in, make other loans to, or have other relationships with the Borrower and its
Affiliates.

         9.14. Maximum Interest Rate. No provision of this Agreement or of any
other Loan Document shall require the payment or the collection of interest in
excess of the maximum amount permitted by applicable law. If any excess of
interest in such respect is hereby provided for, or shall be adjudicated to be
so provided, in any Loan Document or otherwise in connection with this loan
transaction, the provisions of this Section shall govern and prevail and neither
Borrower nor the sureties, guarantors, successors, or assigns of the Borrower
shall be obligated to pay the excess amount of such interest or any other excess
sum paid for the use, forbearance, or detention of sums loaned pursuant hereto.
In the event any Lender or the Administrative Agent ever receives, collects, or
applies as interest any such sum, such amount which would be in excess of the
maximum amount permitted by applicable law shall be applied as a payment and
reduction of the principal of the indebtedness owing under this Agreement; and,
if the principal owing has been paid in full, any remaining excess shall
forthwith be paid to the Borrower. In determining whether or not the interest
paid or payable exceeds the Maximum Rate, the Borrower, the Administrative
Agent, and each Lender shall, to the extent permitted by applicable law, (a)
characterize any non-principal payment as an expense, fee, or premium rather
than as interest, (b) exclude voluntary prepayments and the effects thereof, and
(c) amortize, prorate, allocate, and spread in equal or unequal parts the total
amount of interest throughout the entire

                                      -54-
<PAGE>   62

contemplated term of the indebtedness owing pursuant to this Agreement so that
interest for the entire term does not exceed the Maximum Rate.

         9.15. Non-Application of Chapter 346 of Texas Finance Code. The
provisions of Chapter 346 of the Texas Credit Code, as amended from time to
time, are specifically declared by the parties hereto not to be applicable to
this Agreement or any of the other Loan Documents or to the transactions
contemplated hereby.

         9.16. Survival of Prior Agreements. The rights and privileges
(excluding the confidentiality and indemnification provisions which are being
restated pursuant to this Agreement) afforded the Administrative Agent and the
Arranger in that certain commitment letter and that certain fee letter, each
dated August 9, 2000 among such Persons and Borrower, shall survive the
execution and delivery of this Agreement, and the Administrative Agent and the
Arranger shall continue to be entitled to the benefits thereof.

                                    ARTICLE X

                            THE ADMINISTRATIVE AGENT

         10.1. Appointment; Nature of Relationship. Bank One, NA, is hereby
appointed by each of the Lenders as its contractual representative (herein
referred to as the "Administrative Agent") hereunder and under each other Loan
Document, and each of the Lenders irrevocably authorizes the Administrative
Agent to act as the contractual representative of such Lender with the rights
and duties expressly set forth herein and in the other Loan Documents. The
Administrative Agent agrees to act as such contractual representative upon the
express conditions contained in this Article X. Notwithstanding the use of the
defined term "Administrative Agent," it is expressly understood and agreed that
the Administrative Agent shall not have any fiduciary responsibilities to any
Lender by reason of this Agreement or any other Loan Document and that the
Administrative Agent is merely acting as the contractual representative of the
Lenders with only those duties as are expressly set forth in this Agreement and
the other Loan Documents. In its capacity as the Lenders' contractual
representative, the Administrative Agent (i) does not hereby assume any
fiduciary duties to any of the Lenders, (ii) is a "representative" of the
Lenders within the meaning of Section 9-102 of the Uniform Commercial Code and
(iii) is acting as an independent contractor, the rights and duties of which are
limited to those expressly set forth in this Agreement and the other Loan
Documents. Each of the Lenders hereby agrees to assert no claim against the
Administrative Agent on any agency theory or any other theory of liability for
breach of fiduciary duty, all of which claims each Lender hereby waives.

         10.2. Powers. The Administrative Agent shall have and may exercise such
powers under the Loan Documents as are specifically delegated to the
Administrative Agent by the terms of each thereof, together with such powers as
are reasonably incidental thereto. The Administrative Agent shall have no
implied duties to the Lenders, or any obligation to the Lenders to take any
action thereunder except any action specifically provided by the Loan Documents
to be taken by the Administrative Agent.

                                      -55-
<PAGE>   63

         10.3. General Immunity. Neither the Administrative Agent nor any of its
directors, officers, agents or employees shall be liable to the Borrower, the
Lenders or any Lender for any action taken or omitted to be taken by it or them
hereunder or under any other Loan Document or in connection herewith or
therewith except to the extent such action or inaction is determined in a final
non-appealable judgment by a court of competent jurisdiction to have arisen from
the gross negligence, bad faith or willful misconduct of such Person.

         10.4. No Responsibility for Credit Extensions, Recitals, etc. Neither
the Administrative Agent nor any of its directors, officers, agents or employees
shall be responsible for or have any duty to ascertain, inquire into, or verify
(a) any statement, warranty or representation made in connection with any Loan
Document or any borrowing hereunder; (b) the performance or observance of any of
the covenants or agreements of any obligor under any Loan Document, including,
without limitation, any agreement by an obligor to furnish information directly
to each Lender; (c) the satisfaction of any condition specified in Article IV,
except receipt of items required to be delivered solely to the Administrative
Agent; (d) the existence or possible existence of any Default or Unmatured
Default; (e) the validity, enforceability, effectiveness, sufficiency or
genuineness of any Loan Document or any other instrument or writing furnished in
connection therewith; (f) the value, sufficiency, creation, perfection or
priority of any Lien in any collateral security; or (g) the financial condition
of the Borrower or any guarantor of any of the Obligations or of any of the
Borrower's or any such guarantor's respective Subsidiaries. The Administrative
Agent shall have no duty to disclose to the Lenders information that is not
required to be furnished by the Borrower to the Administrative Agent at such
time, but is voluntarily furnished by the Borrower to the Administrative Agent
(either in its capacity as Administrative Agent or in its individual capacity).

         10.5. Action on Instructions of Lenders. The Administrative Agent shall
in all cases be fully protected in acting, or in refraining from acting,
hereunder and under any other Loan Document in accordance with written
instructions signed by the Required Lenders or all Lenders, as the case may be,
and such instructions and any action taken or failure to act pursuant thereto
shall be binding on all of the Lenders. The Lenders hereby acknowledge that the
Administrative Agent shall be under no duty to take any discretionary action
permitted to be taken by it pursuant to the provisions of this Agreement or any
other Loan Document unless it shall be requested in writing to do so by the
Required Lenders. The Administrative Agent shall be fully justified in failing
or refusing to take any action hereunder and under any other Loan Document
unless it shall first be indemnified to its satisfaction by the Lenders pro rata
against any and all liability, cost and expense that it may incur by reason of
taking or continuing to take any such action.

         10.6. Employment of Administrative Agents and Counsel. The
Administrative Agent may execute any of its duties as Administrative Agent
hereunder and under any other Loan Document by or through employees, agents, and
attorneys-in-fact and shall not be answerable to the Lenders, except as to money
or securities received by it or its authorized agents, for the default or
misconduct of any such agents or attorneys-in-fact selected by it with
reasonable care. The Administrative Agent shall be entitled to advice of counsel
concerning the contractual arrangement between the Administrative Agent and the
Lenders and all matters pertaining to the Administrative Agent's duties
hereunder and under any other Loan Document.

                                      -56-
<PAGE>   64

         10.7. Reliance on Documents; Counsel. The Administrative Agent shall be
entitled to rely upon any Note, notice, consent, certificate, affidavit, letter,
telegram, statement, paper or document believed by it to be genuine and correct
and to have been signed or sent by the proper person or persons, and, in respect
to legal matters, upon the opinion of counsel selected by the Administrative
Agent, which counsel may be employees of the Administrative Agent.

         10.8. Administrative Agent's Reimbursement and Indemnification. The
Lenders agree to reimburse and indemnify the Administrative Agent ratably in
proportion to their respective Commitments (or, if the Commitments have been
terminated, in proportion to their Commitments immediately prior to such
termination) (i) for any amounts not reimbursed by the Borrower for which the
Administrative Agent is entitled to reimbursement by the Borrower under the Loan
Documents, (ii) for any other expenses incurred by the Administrative Agent on
behalf of the Lenders, in connection with the preparation, execution, delivery,
administration and enforcement of the Loan Documents (including, without
limitation, for any expenses incurred by the Administrative Agent in connection
with any dispute between the Administrative Agent and any Lender or between two
or more of the Lenders) and (iii) for any liabilities, obligations, losses,
damages, penalties, actions, judgments, suits, costs, expenses or disbursements
of any kind and nature whatsoever which may be imposed on, incurred by or
asserted against the Administrative Agent in any way relating to or arising out
of the Loan Documents or any other document delivered in connection therewith or
the transactions contemplated thereby (including, without limitation, for any
such amounts incurred by or asserted against the Administrative Agent in
connection with any dispute between the Administrative Agent and any Lender or
between two or more of the Lenders), or the enforcement of any of the terms of
the Loan Documents or of any such other documents, provided that (i) no Lender
shall be liable for any of the foregoing to the extent any of the foregoing is
found in a final non-appealable judgment by a court of competent jurisdiction to
have resulted from the gross negligence or willful misconduct of the
Administrative Agent and (ii) any indemnification required pursuant to Section
3.5(vii) shall, notwithstanding the provisions of this Section 10.8, be paid by
the relevant Lender in accordance with the provisions thereof. The obligations
of the Lenders under this Section 10.8 shall survive payment of the Obligations
and termination of this Agreement.

         10.9. Notice of Default. The Administrative Agent shall not be deemed
to have knowledge or notice of the occurrence of any Default or Unmatured
Default hereunder unless the Administrative Agent has received written notice
from a Lender or the Borrower referring to this Agreement describing such
Default or Unmatured Default and stating that such notice is a "notice of
default". In the event that the Administrative Agent receives such a notice, the
Administrative Agent shall give prompt notice thereof to the Lenders.

         10.10. Rights as a Lender. In the event the Administrative Agent is a
Lender, the Administrative Agent shall have the same rights and powers hereunder
and under any other Loan Document with respect to its Commitment and its Credit
Extensions as any Lender and may exercise the same as though it were not the
Administrative Agent, and the term "Lender" or "Lenders" shall, at any time when
the Administrative Agent is a Lender, unless the context otherwise indicates,
include the Administrative Agent in its individual capacity. The Administrative
Agent and its Affiliates may accept deposits from, lend money to, and generally
engage in any kind of trust, debt, equity or other transaction, in addition to
those contemplated by this Agreement or any other Loan Document, with the
Borrower or any of its Subsidiaries in

                                      -57-
<PAGE>   65

which the Borrower or such Subsidiary is not restricted hereby from engaging
with any other Person.

         10.11. Lender Credit Decision. Each Lender acknowledges that it has,
independently and without reliance upon the Administrative Agent, the Arranger
or any other Lender and based on the financial statements prepared by the
Borrower and such other documents and information as it has deemed appropriate,
made its own credit analysis and decision to enter into this Agreement and the
other Loan Documents. Each Lender also acknowledges that it will, independently
and without reliance upon the Administrative Agent, the Arranger or any other
Lender and based on such documents and information as it shall deem appropriate
at the time, continue to make its own credit decisions in taking or not taking
action under this Agreement and the other Loan Documents.

         10.12. Successor Administrative Agent. The Administrative Agent may
resign at any time by giving written notice thereof to the Lenders and the
Borrower, such resignation to be effective upon the appointment of a successor
Administrative Agent or, if no successor Administrative Agent has been
appointed, forty-five days after the retiring Administrative Agent gives notice
of its intention to resign. The Administrative Agent may be removed at any time
with or without cause by written notice received by the Administrative Agent
from the Required Lenders, such removal to be effective on the date specified by
the Required Lenders. Upon any such resignation or removal, the Required Lenders
shall have the right to appoint, on behalf of the Borrower and the Lenders, a
successor Administrative Agent. If no successor Administrative Agent shall have
been so appointed by the Required Lenders within thirty days after the resigning
Administrative Agent's giving notice of its intention to resign, then the
resigning Administrative Agent may appoint, on behalf of the Borrower and the
Lenders, a successor Administrative Agent. Notwithstanding the previous
sentence, the Administrative Agent may at any time without the consent of the
Borrower or any Lender, appoint any of its Affiliates which is a commercial bank
as a successor Administrative Agent hereunder. If the Administrative Agent has
resigned or been removed and no successor Administrative Agent has been
appointed, the Lenders may perform all the duties of the Administrative Agent
hereunder and the Borrower shall make all payments in respect of the Obligations
to the applicable Lender and for all other purposes shall deal directly with the
Lenders. No successor Administrative Agent shall be deemed to be appointed
hereunder until such successor Administrative Agent has accepted the
appointment. Any such successor Administrative Agent shall be a commercial bank
having capital and retained earnings of at least $1,000,000,000. Upon the
acceptance of any appointment as Administrative Agent hereunder by a successor
Administrative Agent, such successor Administrative Agent shall thereupon
succeed to and become vested with all the rights, powers, privileges and duties
of the resigning or removed Administrative Agent. Upon the effectiveness of the
resignation or removal of the Administrative Agent, the resigning or removed
Administrative Agent shall be discharged from its duties and obligations
hereunder and under the Loan Documents. After the effectiveness of the
resignation or removal of an Administrative Agent, the provisions of this
Article X shall continue in effect for the benefit of such Administrative Agent
in respect of any actions taken or omitted to be taken by it while it was acting
as the Administrative Agent hereunder and under the other Loan Documents. In the
event that there is a successor to the Administrative Agent by merger, or the
Administrative Agent assigns its duties and obligations to an Affiliate pursuant
to this Section 10.12, then the

                                      -58-
<PAGE>   66

term "Prime Rate" as used in this Agreement shall mean the prime rate, base rate
or other analogous rate of the new Administrative Agent.

         10.13. Administrative Agent and Arranger Fees. The Borrower agrees to
pay to the Administrative Agent and the Arranger, for their respective accounts,
the fees agreed to by the Borrower, the Administrative Agent and the Arranger
pursuant to that certain letter agreement dated August 9, 2000, or as otherwise
agreed from time to time.

         10.14. Delegation to Affiliates. The Borrower and the Lenders agree
that the Administrative Agent may delegate any of its duties under this
Agreement to any of its Affiliates. Any such Affiliate (and such Affiliate's
directors, officers, agents and employees) which performs duties in connection
with this Agreement shall be entitled to the same benefits of the
indemnification, waiver and other protective provisions to which the
Administrative Agent is entitled under Articles IX and X.

         10.15. Co-Agents, Documentation Agent, Syndication Agent, etc. Neither
any of the Lenders identified in this Agreement as a "co-agent" nor the
Documentation Agent or the Syndication Agent shall have any right, power,
obligation, liability, responsibility or duty under this Agreement other than
those applicable to all Lenders as such. Without limiting the foregoing, none of
such Lenders shall have or be deemed to have a fiduciary relationship with any
Lender. Each Lender hereby makes the same acknowledgments with respect to such
Lenders as it makes with respect to the Administrative Agent in Section 10.11.

                                   ARTICLE XI

                            SETOFF; RATABLE PAYMENTS

         11.1. Setoff. In addition to, and without limitation of, any rights of
the Lenders under applicable law, if the Borrower becomes insolvent, however
evidenced, or any Default occurs, any and all deposits (including all account
balances, whether provisional or final and whether or not collected or
available) and any other Indebtedness at any time held or owing by any Lender or
any Affiliate of any Lender to or for the credit or account of the Borrower may
be offset and applied toward the payment of the Obligations owing to such
Lender, whether or not the Obligations, or any part thereof, shall then be due.

         11.2. Ratable Payments. If any Lender, whether by setoff or otherwise,
has payment made to it upon its Outstanding Credit Exposure (other than payments
received pursuant to Section 3.1, 3.2, 3.4 or 3.5) in a greater proportion than
that received by any other Lender, such Lender agrees, promptly upon demand, to
purchase a portion of the Aggregate Outstanding Credit Exposure held by the
other Lenders so that after such purchase each Lender will hold its Pro Rata
Share of the Aggregate Outstanding Credit Exposure. If any Lender, whether in
connection with setoff or amounts which might be subject to setoff or otherwise,
receives collateral or other protection for its Obligations or such amounts
which may be subject to setoff, such Lender agrees, promptly upon demand, to
take such action necessary such that all Lenders share in the benefits of such
collateral ratably in proportion to their respective Pro Rata Share of the
Aggregate Outstanding Credit Exposure. In case any such payment is disturbed by
legal process, or otherwise, appropriate further adjustments shall be made.

                                      -59-
<PAGE>   67

                                   ARTICLE XII

                BENEFIT OF AGREEMENT; ASSIGNMENTS; PARTICIPATIONS

         12.1. Successors and Assigns. The terms and provisions of the Loan
Documents shall be binding upon and inure to the benefit of the Borrower and the
Lenders and their respective successors and assigns, except that (i) Borrower
shall not have the right to assign its rights or obligations under the Loan
Documents and (ii) any assignment by any Lender must be made in compliance with
Section 12.3. The parties to this Agreement acknowledge that clause (ii) of this
Section 12.1 relates only to absolute assignments and does not prohibit
assignments creating security interests, including, without limitation, any
pledge or assignment by any Lender of all or any portion of its rights under
this Agreement and any Note to a Federal Reserve Bank; provided, however, that
no such pledge or assignment creating a security interest shall release the
transferor Lender from its obligations hereunder unless and until the parties
thereto have complied with the provisions of Section 12.3. The Administrative
Agent may treat the Person which made any Credit Extension or which holds any
Note as the owner thereof for all purposes hereof unless and until such Person
complies with Section 12.3; provided, however, that the Administrative Agent may
in its discretion (but shall not be required to) follow instructions from the
Person which made any Credit Extension or which holds any Note to direct
payments relating to such Credit Extension or Note to another Person. Any
assignee of the rights to any Credit Extension or any Note agrees by acceptance
of such assignment to be bound by all the terms and provisions of the Loan
Documents. Any request, authority or consent of any Person, who at the time of
making such request or giving such authority or consent is the owner of the
rights to any Credit Extension (whether or not a Note has been issued in
evidence thereof), shall be conclusive and binding on any subsequent holder or
assignee of the rights to such Credit Extension.

         12.2. Participations.

                  12.2.1 Permitted Participants; Effect. Any Lender may, in the
         ordinary course of its business and in accordance with applicable law,
         at any time sell to one or more banks or other entities
         ("Participants") participating interests in any Outstanding Credit
         Exposure of such Lender, any Note held by such Lender, any Commitment
         of such Lender or any other interest of such Lender under the Loan
         Documents. In the event of any such sale by a Lender of participating
         interests to a Participant, such Lender's obligations under the Loan
         Documents shall remain unchanged, such Lender shall remain solely
         responsible to the other parties hereto for the performance of such
         obligations, such Lender shall remain the owner of its Outstanding
         Credit Exposure and the holder of any Note issued to it in evidence
         thereof for all purposes under the Loan Documents, all amounts payable
         by the Borrower under this Agreement shall be determined as if such
         Lender had not sold such participating interests, and the Borrower and
         the Administrative Agent shall continue to deal solely and directly
         with such Lender in connection with such Lender's rights and
         obligations under the Loan Documents.

                  12.2.2 Voting Rights. Each Lender shall retain the sole right
         to approve, without the consent of any Participant, any amendment,
         modification or waiver of any provision of the Loan Documents other
         than any amendment, modification or waiver

                                      -60-
<PAGE>   68

         with respect to any Credit Extension or Commitment in which such
         Participant has an interest which forgives principal, interest, fees or
         any Reimbursement Obligation or reduces the interest rate or fees
         payable with respect to any such Credit Extension or Commitment,
         extends the Facility Termination Date, postpones any date fixed for any
         regularly-scheduled payment of principal of or interest on any Credit
         Extension in which such Participant has an interest, or any
         regularly-scheduled payment of fees on any such Credit Extension or
         Commitment, releases any guarantor of any such Credit Extension (except
         as otherwise permitted by Section 8.2(v)) or releases any collateral
         held in the Facility LC Collateral Account (except in accordance with
         the terms hereof) or all or substantially all of any other collateral,
         if any, securing any such Credit Extension.

                  12.2.3 Benefit of Setoff. The Borrower agrees that each
         Participant shall be deemed to have the right of setoff provided in
         Section 11.1 in respect of its participating interest in amounts owing
         under the Loan Documents to the same extent as if the amount of its
         participating interest were owing directly to it as a Lender under the
         Loan Documents, provided that each Lender shall retain the right of
         setoff provided in Section 11.1 with respect to the amount of
         participating interests sold to each Participant. The Lenders agree to
         share with each Participant, and each Participant, by exercising the
         right of setoff provided in Section 11.1, agrees to share with each
         Lender, any amount received pursuant to the exercise of its right of
         setoff, such amounts to be shared in accordance with Section 11.2 as if
         each Participant were a Lender.

         12.3. Assignments.

                  12.3.1 Permitted Assignments. Any Lender may, in the ordinary
         course of its business and in accordance with applicable law, at any
         time assign to one or more banks or other entities ("Purchasers") all
         or any part of its rights and obligations under the Loan Documents;
         provided however, if such assignments are of Eurodollar Loans prior to
         the last day of the Interest Period applicable thereto, the Borrower
         will not be required to pay the breakage fees, if any, associated with
         such assignment. Such assignment shall be substantially in the form of
         Exhibit C or in such other form as may be agreed to by the parties
         thereto. The consent of the Borrower, the Administrative Agent and the
         LC Issuer shall be required prior to an assignment becoming effective
         with respect to a Purchaser which is not a Lender or an Affiliate
         thereof; provided, however, that if a Default has occurred and is
         continuing, the consent of the Borrower shall not be required. Such
         consent from any of the Borrower, the Administrative Agent and the LC
         Issuer shall not be unreasonably withheld or delayed. Each such
         assignment with respect to a Purchaser which is not a Lender or an
         Affiliate thereof shall (unless each of the Borrower and the
         Administrative Agent otherwise consents) be in an amount not less than
         the lesser of (i) $5,000,000 or (ii) the remaining amount of the
         assigning Lender's Commitment (calculated as at the date of such
         assignment) or outstanding Credit Extensions (if the applicable
         Commitment has been terminated).

                  12.3.2 Effect; Effective Date. Upon (i) delivery to the
         Administrative Agent of a notice of assignment, substantially in the
         form attached as Exhibit I to Exhibit C (a "Notice of Assignment"),
         together with any consents required by Section 12.3.1, and (ii)
         effective on and after January 9, 2001, payment of a $4,000 fee to the
         Administrative

                                      -61-
<PAGE>   69

         Agent for processing such assignment, such assignment shall become
         effective on the effective date specified in such Notice of Assignment.
         The Notice of Assignment shall contain a representation by the
         Purchaser to the Administrative Agent and the Borrower to the effect
         that none of the consideration used to make the purchase of the
         Commitment and Outstanding Credit Exposure under the applicable
         assignment agreement are "plan assets" as defined under ERISA and that
         the rights and interests of the Purchaser in and under the Loan
         Documents will not be "plan assets" under ERISA. On and after the
         effective date of such assignment, such Purchaser shall for all
         purposes be a Lender party to this Agreement and any other Loan
         Document executed by or on behalf of the Lenders and shall have all the
         rights and obligations of a Lender under the Loan Documents, to the
         same extent as if it were an original party hereto, and no further
         consent or action by the Borrower, the Lenders or the Administrative
         Agent shall be required to release the transferor Lender with respect
         to the percentage of the Aggregate Commitment and Outstanding Credit
         Exposure assigned to such Purchaser. Upon the consummation of any
         assignment to a Purchaser pursuant to this Section 12.3.2, the
         transferor Lender, the Administrative Agent and the Borrower shall, if
         the transferor Lender or the Purchaser desires that its Loans be
         evidenced by Notes, make appropriate arrangements so that new Notes or,
         as appropriate, replacement Notes are issued to such transferor Lender
         and new Notes or, as appropriate, replacement Notes, are issued to such
         Purchaser, in each case in principal amounts reflecting their
         respective Commitments, as adjusted pursuant to such assignment.

         12.4. Dissemination of Information. The Borrower authorizes each Lender
to disclose to any Participant or Purchaser or any other Person acquiring an
interest in the Loan Documents by operation of law (each a "Transferee") and any
prospective Transferee any and all information in such Lender's possession
concerning the creditworthiness of the Borrower and its Subsidiaries, including
without limitation any information contained in any Reports; provided that each
Transferee and prospective Transferee agrees to be bound by Section 9.11 of this
Agreement.

         12.5. Tax Treatment. If any interest in any Loan Document is
transferred to any Transferee which is organized under the laws of any
jurisdiction other than the United States or any State thereof, the transferor
Lender shall cause such Transferee, concurrently with the effectiveness of such
transfer, to comply with the provisions of Section 3.5(iv).

                                  ARTICLE XIII

                                     NOTICES

         13.1. Notices. Except as otherwise permitted by Section 2.14 with
respect to borrowing notices, all notices, requests and other communications to
any party hereunder shall be in writing (including electronic transmission,
facsimile transmission or similar writing) and shall be given to such party: (x)
in the case of the Borrower or the Administrative Agent, at its address or
facsimile number set forth on the signature pages hereof, (y) in the case of any
Lender, at its address or facsimile number set forth below its signature hereto,
or (z) in the case of any party, at such other address or facsimile number as
such party may hereafter specify for the purpose by notice to the Administrative
Agent and the Borrower in accordance with the provisions of this Section 13.1.
Each such notice, request or other communication shall be effective (i) if given
by

                                      -62-
<PAGE>   70

facsimile transmission, when transmitted to the facsimile number specified in
this Section and confirmation of receipt is received, (ii) if given by mail, 72
hours after such communication is deposited in the mails with first class
postage prepaid, addressed as aforesaid, or (iii) if given by any other means,
when delivered (or, in the case of electronic transmission, received) at the
address specified in this Section; provided that notices to the Administrative
Agent under Article II shall not be effective until received.

         13.2. Change of Address. The Borrower, the Administrative Agent and any
Lender may each change the address for service of notice upon it by a notice in
writing to the other parties hereto.

                                   ARTICLE XIV

                                  COUNTERPARTS

         This Agreement may be executed in any number of counterparts, all of
which taken together shall constitute one agreement, and any of the parties
hereto may execute this Agreement by signing any such counterpart. This
Agreement shall be effective when it has been executed by the Borrower, the
Administrative Agent, the LC Issuer and the Lenders and each party has notified
the Administrative Agent by facsimile transmission or telephone that it has
taken such action.

                                   ARTICLE XV

          CHOICE OF LAW; CONSENT TO JURISDICTION; WAIVER OF JURY TRIAL

         15.1. CHOICE OF LAW. THE LOAN DOCUMENTS (OTHER THAN THOSE CONTAINING A
CONTRARY EXPRESS CHOICE OF LAW PROVISION) SHALL BE CONSTRUED IN ACCORDANCE WITH
THE INTERNAL LAWS WITHOUT REGARD TO THE CONFLICT OF LAWS PROVISIONS) OF THE
STATE OF TEXAS, BUT GIVING EFFECT TO FEDERAL LAWS APPLICABLE TO NATIONAL BANKS.

         15.2. CONSENT TO JURISDICTION. THE BORROWER HEREBY IRREVOCABLY SUBMITS
TO THE NON-EXCLUSIVE JURISDICTION OF ANY UNITED STATES FEDERAL OR TEXAS STATE
COURT SITTING IN DALLAS, TEXAS IN ANY ACTION OR PROCEEDING ARISING OUT OF OR
RELATING TO ANY LOAN DOCUMENTS AND THE BORROWER HEREBY IRREVOCABLY AGREES THAT
ALL CLAIMS IN RESPECT OF SUCH ACTION OR PROCEEDING MAY BE HEARD AND DETERMINED
IN ANY SUCH COURT AND IRREVOCABLY WAIVES ANY OBJECTION IT MAY NOW OR HEREAFTER
HAVE AS TO THE VENUE OF ANY SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN SUCH A
COURT OR THAT SUCH COURT IS AN INCONVENIENT FORUM. NOTHING HEREIN SHALL LIMIT
THE RIGHT OF THE ADMINISTRATIVE AGENT, THE LC ISSUER OR ANY LENDER TO BRING
PROCEEDINGS AGAINST THE BORROWER IN THE COURTS OF ANY OTHER JURISDICTION. ANY
JUDICIAL PROCEEDING BY THE BORROWER AGAINST THE ADMINISTRATIVE AGENT, THE LC
ISSUER

                                      -63-
<PAGE>   71

OR ANY LENDER OR ANY AFFILIATE OF THE ADMINISTRATIVE AGENT, THE LC ISSUER OR ANY
LENDER INVOLVING, DIRECTLY OR INDIRECTLY, ANY MATTER IN ANY WAY ARISING OUT OF,
RELATED TO, OR CONNECTED WITH ANY LOAN DOCUMENT SHALL BE BROUGHT ONLY IN A COURT
IN DALLAS, TEXAS.

         15.3. WAIVER OF JURY TRIAL. THE BORROWER, THE ADMINISTRATIVE AGENT, THE
LC ISSUER AND EACH LENDER HEREBY WAIVE TRIAL BY JURY IN ANY JUDICIAL PROCEEDING
INVOLVING, DIRECTLY OR INDIRECTLY, ANY MATTER (WHETHER SOUNDING IN TORT,
CONTRACT OR OTHERWISE) IN ANY WAY ARISING OUT OF, RELATED TO, OR CONNECTED WITH
ANY LOAN DOCUMENT OR THE RELATIONSHIP ESTABLISHED THEREUNDER.

         15.4. Effect of Amendment and Restatement.

                  (a) This Agreement is an amendment and restatement of the
         terms and provisions of the Existing Credit Agreement. The indebtedness
         of the Borrower outstanding under the Existing Credit Agreement and the
         Notes outstanding thereunder immediately prior to the effectiveness
         hereof ("Restatement Effective Time") is called the "Existing
         Indebtedness". Neither the execution and delivery of this Agreement by
         the Borrower or any Lender, nor any of the terms or provisions
         contained herein, shall be construed to be a payment on or with respect
         to the Existing Indebtedness or any accrued interest thereon. Without
         limiting the foregoing, the Borrower and each of its Subsidiaries
         hereby ratifies and confirms each Loan Document to which such Person is
         a party including without limitation the Guaranty.

                  (b) Notwithstanding any provision of this Agreement to the
         contrary, all Eurodollar Advances which are outstanding at the
         Restatement Effective Time (each an "Existing Eurodollar Borrowing")
         shall continue to be maintained by the Lenders until the last day of
         the current Interest Period therefor (except to the extent prepaid or
         converted by the Borrower prior to such date).

                  [Remainder of Page Intentionally Left Blank]

                                      -64-
<PAGE>   72

         IN WITNESS WHEREOF, the Borrower, the Lenders, the LC Issuer and the
Administrative Agent have executed this Agreement as of the date first above
written.

                                   CENTEX CONSTRUCTION PRODUCTS, INC.,
                                   as Borrower

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Address:       2728 N. Harwood
                                                  Dallas, Texas  75201

                                   Attention:     Arthur R. Zunker, Jr.
                                                  Chief Financial Officer
                                   Telephone:     (214) 981-6510
                                   FAX:           (214) 981-6559

                                      -65-
<PAGE>   73

Commitments:
$35,000,000                        BANK ONE,  NA,
                                   Individually, as Administrative Agent, LC
                                   Issuer and as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Address:       1717 Main Street, 3rd Floor
                                                  Dallas, Texas  75201

                                   Attention:     Kathy M. Turner
                                   Telephone:     (214) 290-4438
                                   FAX:           (214) 290-2765

                                      -66-
<PAGE>   74

$30,000,000                        BANK OF AMERICA, N.A.,
                                   Individually, as Syndication Agent and as a
                                   Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        Kelly Allred
                                   Telephone:        (949) 260-5654
                                   FAX:              (949) 260-5638

                                      -67-
<PAGE>   75

$35,000,000                        PNC BANK, NATIONAL ASSOCIATION
                                   Individually, as Documentation Agent and as
                                   a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:     Philip Liebscher

                                   Telephone:     (412) 762-3202
                                   FAX:           (412) 762-6484

                                      -68-
<PAGE>   76

$15,000,000                        BNP PARIBAS,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        Henry F. Setina

                                   Telephone:        (972) 788-9191
                                   FAX:              (972) 788-9140

                                      -69-
<PAGE>   77

$15,000,000                        THE CHASE MANHATTAN BANK,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:      Allen K. King

                                   Telephone:      (214) 965-2705
                                   FAX:            (214) 965-2044

                                      -70-
<PAGE>   78

$15,000,000                        FIRSTAR BANK, N.A.,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        Gregory L. Dryden

                                   Telephone:        (314) 418-3983
                                   FAX:              (314) 418-3859

                                      -71-
<PAGE>   79

$15,000,000                        THE BANK OF TOKYO-MITSUBISHI, LTD.,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        John M. Mearns

                                   Telephone:        (214) 954-1200
                                   FAX:              (214) 954-1007

                                      -72-
<PAGE>   80

$25,000,000                        CREDIT LYONNAIS NEW YORK BRANCH,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        Robert Smith

                                   Telephone:        (214) 220-2311
                                   FAX:              (214) 220-2323

                                      -73-
<PAGE>   81

$20,000,000                        SUNTRUST BANK,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        Donald L. Gaudette, Jr.

                                   Telephone:        (404) 658-4925
                                   FAX:              (404) 827-6270

                                      -74-
<PAGE>   82

$10,000,000                        BANK HAPOALIM B.M.,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        Gabriel Lubiner

                                   Telephone:        (212) 782-2197
                                   FAX:              (212) 782-2187

                                      -75-
<PAGE>   83

$15,000,000                        HARRIS TRUST AND SAVINGS BANK,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        James J. Owen

                                   Telephone:        (312) 461-2962
                                   FAX:              (312) 765-8105

                                      -76-
<PAGE>   84

$20,000,000                        BANK OF TEXAS, N.A.,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        David Broussard, Jr.

                                   Telephone:        (214) 987-8863
                                   FAX:              (214) 987-8892

                                      -77-
<PAGE>   85

$15,000,000                        COMERICA BANK,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        Carol S. Geraghty

                                   Telephone:        (972) 361-2548
                                   FAX:              (972) 361-2550

                                      -78-
<PAGE>   86

$10,000,000                        UMB BANK, N.A.,
                                   as a Lender

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   Attention:        Terry Dierks

                                   Telephone:        (816) 860-7101
                                   FAX:              (816) 860-3772

$275,000,000

                                      -79-
<PAGE>   87

         Each Guarantor hereby consents and agrees to this Agreement and agrees
that the Guaranty shall remain in full force and effect and shall continue to
(i) guarantee the Guaranteed Obligations (as defined in the Guaranty) and (ii)
be the legal, valid and binding obligation of such Guarantor enforceable against
such Guarantor in accordance with its terms.

                                   GUARANTORS:

                                   REPUBLIC HOLDING CORPORATION
                                   REPUBLIC GYPSUM OPERATING LLC
                                   REPUBLIC GYPSUM HOLDING LLC
                                   REPUBLIC PAPERBOARD COMPANY LLC
                                   HOLLIS & EASTERN RAILROAD COMPANY LLC
                                   AMERICAN GYPSUM COMPANY
                                   AMERICAN GYPSUM MARKETING COMPANY
                                   CCP CEMENT COMPANY
                                   CCP CONCRETE/AGGREGATES COMPANY
                                   CCP GYPSUM COMPANY
                                   CENTEX MATERIALS GP LTD, LLC
                                   MATHEWS READYMIX, INC.
                                   MOUNTAIN CEMENT COMPANY
                                   NEVADA CEMENT COMPANY
                                   TLCC GP LLC
                                   TEXAS CEMENT COMPANY
                                   WESTERN AGGREGATES, INC.

                                   By:
                                       -----------------------------------------
                                       Arthur R. Zunker, Jr.
                                       Senior Vice President - Finance and
                                       Treasurer

                                   REPUBLIC GYPSUM COMPANY, LP

                                   By: REPUBLIC GYPSUM OPERATING LLC,
                                       as its general partner

                                       By:
                                          --------------------------------------
                                          Arthur R. Zunker, Jr.
                                          Senior Vice President - Finance and
                                          Treasurer

                                      -80-
<PAGE>   88

                                   CENTEX MATERIALS, LP

                                   By: CENTEX MATERIALS GP LTD, LLC,
                                       as its general partner

                                       By:
                                          --------------------------------------
                                          Arthur R. Zunker, Jr.
                                          Senior Vice President - Finance and
                                          Treasurer

                                   CENTEX MATERIALS LP LTD, LLC

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                   TLCC LP LLC

                                   By:
                                      ------------------------------------------
                                   Name:
                                        ----------------------------------------
                                   Title:
                                         ---------------------------------------

                                      -81-

<PAGE>   89
                                    EXHIBIT A

                                Pricing Schedule

<Table>
<Caption>
                                     APPLICABLE MARGIN           APPLICABLE MARGIN          APPLICABLE FEE RATE
            STATUS                  FOR EURODOLLAR RATE          FOR FLOATING RATE          FOR COMMITMENT FEE
            ------                  -------------------          -----------------          -------------------
<S>                                 <C>                          <C>                        <C>
Level I Status                             1.00%                       0.00%                      0.250%

Level II Status                            1.25%                       0.25%                      0.250%

Level III Status                           1.50%                       0.50%                      0.300%

Level IV Status                            1.75%                       0.75%                      0.375%

Level V Status                             2.25%                       1.25%                      0.500%

Level VI Status                            2.50%                       1.50%                      0.500%

Level VII Status                           2.75%                       1.75%                      0.500%
</Table>

         For the purposes of this Schedule, the following terms have the
following meanings, subject to the final paragraph of this Schedule:

         "Financials" means the annual or quarterly financial statements of the
Borrower delivered pursuant to Section 6.1(i) or (ii).

         "Level I Status" exists at any date if, as of the last day of the
fiscal quarter of the Borrower referred to in the most recent Financials, the
Leverage Ratio is less than 1.00 to 1.00.

         "Level II Status" exists at any date if, as of the last day of the
fiscal quarter of the Borrower referred to in the most recent Financials, (i)
the Borrower has not qualified for Level I Status and (ii) the Leverage Ratio is
greater than or equal to 1.00 to 1.00 but less than 1.50 to 1.00.

         "Level III Status" exists at any date if, as of the last day of the
fiscal quarter of the Borrower referred to in the most recent Financials, (i)
the Borrower has not qualified for Level I Status or Level II Status and (ii)
the Leverage Ratio is greater than or equal to 1.50 to 1.00 but less than 2.00
to 1.00.

         "Level IV Status" exists at any date if, as of the last day of the
fiscal quarter of the Borrower referred to in the most recent Financials, (i)
the Borrower has not qualified for Level I Status, Level II Status, or Level III
status and (ii) the Leverage Ratio is greater than or equal to 2.00 to 1.00 but
less than 2.50 to 1.00.

         "Level V Status" exists at any date if, as of the last day of the
fiscal quarter of the Borrower referred to in the most recent Financials, (i)
the Borrower has not qualified for Level I Status, Level II Status, Level III
Status, or Level IV Status and (ii) the Leverage Ratio is greater than or equal
to 2.50 to 1.00 but less than 3.00 to 1.00.

EXHIBIT A - Page 1
<PAGE>   90

         "Level VI Status" exists at any date if, as of the last day of the
fiscal quarter of the Borrower referred to in the most recent Financials, (i)
the Borrower has not qualified for Level I Status, Level II Status, Level III
Status, Level IV Status, or Level V Status and (ii) the Leverage Ratio is
greater than or equal to 3.00 to 1.00 but less than 3.25 to 1.00.

         "Level VII Status" exists at any date if the Borrower has not qualified
for Level I Status, Level II Status, Level III Status, Level IV Status, Level V
Status, or Level VI Status.

         "Status" means either Level I Status, Level II Status, Level III
Status, Level IV Status, Level V Status, Level VI Status, or Level VII Status.

         The Applicable Margin and Applicable Fee Rate shall be determined in
accordance with the foregoing table based on the Borrower's Status as reflected
in the then most recent Financials. Adjustments, if any, to the Applicable
Margin or Applicable Fee Rate shall be effective five Business Days after the
Administrative Agent has received the applicable Financials. If the Borrower
fails to deliver the Financials to the Administrative Agent at the time required
pursuant to Section 6.1, then the Applicable Margin and Applicable Fee Rate
shall be the highest Applicable Margin and Applicable Fee Rate set forth in the
foregoing table until five days after such Financials are so delivered.
Notwithstanding the foregoing, (a) the Applicable Margin shall remain no lower
than Level V Status as of July 20, 2001 until the Administrative Agent has
received the applicable Financials for the fiscal quarter ending June 30, 2001,
and (b) the Applicable Fee Rate shall be 0.50% if at any time during such fiscal
quarter the average daily Aggregate Outstanding Credit Exposure is less than 50%
of the Aggregate Commitment.

EXHIBIT A - Page 2
<PAGE>   91
                                    EXHIBIT B

                             COMPLIANCE CERTIFICATE

To:      The Lenders parties to the
         Credit Agreement described below

         This Compliance Certificate is furnished pursuant to that certain
Amended and Restated Credit Agreement dated as of June 30, 2001 to be effective
as of July 20, 2001 (as amended, modified, renewed or extended from time to
time, the "Agreement") among Centex Corporation Products, Inc., a Delaware
corporation (the "Borrower"), the lenders party thereto, Bank of America, N.A.,
as Syndication Agent, PNC Bank, National Association, as Documentation Agent,
Bank One, NA, as LC Issuer and as Administrative Agent for the Lenders. Unless
otherwise defined herein, capitalized terms used in this Compliance Certificate
have the meanings ascribed thereto in the Agreement.

         THE UNDERSIGNED HEREBY CERTIFIES THAT:

         1. I am the duly elected ______________________________ of the
Borrower;

         2. I have reviewed the terms of the Agreement and I have made, or have
caused to be made under my supervision, a detailed review of the transactions
and conditions of the Borrower and its Significant Subsidiaries during the
accounting period covered by the attached financial statements;

         3. The examinations described in paragraph 2 did not disclose, and I
have no knowledge of, the existence of any condition or event which constitutes
a Default or Unmatured Default during or at the end of the accounting period
covered by the attached financial statements or as of the date of this
Certificate, except as set forth below; and

         4. Schedule I attached hereto sets forth financial data and
computations evidencing the Borrower's compliance with certain covenants of the
Agreement, all of which data and computations are true, complete and correct.

         5. Schedule II hereto sets forth the determination of the interest
rates to be paid for Advances, the LC Fee rates and the commitment fee rates
commencing on the fifth day following the delivery hereof.

         6. Schedule III attached hereto sets forth the various reports and
deliveries which are required at this time under the Agreement and the other
Loan Documents and the status of compliance.

         Described below are the exceptions, if any, to paragraph 3 by listing,
in detail, the nature of the condition or event, the period during which it has
existed and the action which the Borrower has taken, is taking, or proposes to
take with respect to each such condition or event:

<PAGE>   92

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

         The foregoing certifications, together with the computations set forth
in Schedule I and Schedule II hereto and the financial statements delivered with
this Certificate in support hereof, are made and delivered this _____ day of
_______________, 200___.

                                       -----------------------------------------

<PAGE>   93

                      SCHEDULE I TO COMPLIANCE CERTIFICATE

                  Compliance as of _______________, 200__ with
              Provisions of _______________ and _______________ of
                                  the Agreement

<PAGE>   94

                      SCHEDULE II TO COMPLIANCE CERTIFICATE

                    Borrower's Applicable Margin Calculation

<PAGE>   95

                     SCHEDULE III TO COMPLIANCE CERTIFICATE

                      Reports and Deliveries Currently Due
<PAGE>   96
                                    EXHIBIT C

                              ASSIGNMENT AGREEMENT

         This Assignment Agreement (this "Assignment Agreement") between
_______________ ______________________________ (the "Assignor") and
______________________________ _______________ (the "Assignee") is dated as of
_______________, 200___, The parties hereto agree as follows:

         1. PRELIMINARY STATEMENT. The Assignor is a party to an Amended and
Restated Credit Agreement (which, as it may be amended, modified, renewed or
extended from time to time is herein called the "Credit Agreement") described in
Item 1 of Schedule 1 attached hereto ("Schedule 1"). Capitalized terms used
herein and not otherwise defined herein shall have the meanings attributed to
them in the Credit Agreement.

         2. ASSIGNMENT AND ASSUMPTION. The Assignor hereby sells and assigns to
the Assignee, and the Assignee hereby purchases and assumes from the Assignor,
an interest in and to the Assignor's rights and obligations under the Credit
Agreement and the other Loan Documents, such that after giving effect to such
assignment the Assignee shall have purchased pursuant to this Assignment
Agreement the percentage interest specified in Item 3 of Schedule 1 of all
outstanding rights and obligations under the Credit Agreement and the other Loan
Documents relating to the facilities listed in Item 3 of Schedule 1. The
aggregate Commitment (or Outstanding Credit Exposure, if the applicable
Commitment has been terminated) purchased by the Assignee hereunder is set forth
in Item 4 of Schedule 1.

         3. EFFECTIVE DATE. The effective date of this Assignment Agreement (the
"Effective Date") shall be the later of the date specified in Item 5 of Schedule
1 or two Business Days (or such shorter period agreed to by the Administrative
Agent) after this Assignment Agreement, together with any consents required
under the Credit Agreement, are delivered to the Administrative Agent. In no
event will the Effective Date occur if the payments required to be made by the
Assignee to the Assignor on the Effective Date are not made on the proposed
Effective Date.

         4. PAYMENT OBLIGATIONS. In consideration for the sale and assignment of
Outstanding Credit Exposure hereunder, the Assignee shall pay the Assignor, on
the Effective Date, the amount agreed to by the Assignor and the Assignee. On
and after the Effective Date, the Assignee shall be entitled to receive all
payments of principal, interest, Reimbursement Obligations and fees with respect
to the interest assigned hereby. The Assignee will promptly remit to the
Assignor any interest on the Outstanding Credit Exposure and fees received from
the Administrative Agent which relate to the portion of the Commitment or
Outstanding Credit Exposure assigned to the Assignee hereunder and not
previously paid by the Assignee to the Assignor. In the event that either party
hereto receives any payment to which the other party hereto is entitled under
this Assignment Agreement, then the party receiving such amount shall promptly
remit it to the other party hereto.

         5. RECORDATION FEE. The Assignor and Assignee each agree to pay
one-half of the recordation fee required to be paid to the Administrative Agent
in connection with this Assignment Agreement unless otherwise specified in Item
6 of Schedule 1.

<PAGE>   97

         6. REPRESENTATIONS OF THE ASSIGNOR; LIMITATIONS ON THE ASSIGNOR'S
LIABILITY. The Assignor represents and warrants that (i) it is the legal and
beneficial owner of the interest being assigned by it hereunder, (ii) such
interest is free and clear of any adverse claim created by the Assignor and
(iii) the execution and delivery of this Assignment Agreement by the Assignor is
duly authorized. It is understood and agreed that the assignment and assumption
hereunder are made without recourse to the Assignor and that the Assignor makes
no other representation or warranty of any kind to the Assignee. Neither the
Assignor nor any of its officers, directors, employees, agents or attorneys
shall be responsible for (i) the due execution, legality, validity,
enforceability, genuineness, sufficiency or collectability of any Loan Document,
including without limitation, documents granting the Assignor and the other
Lenders a security interest in assets of the Borrower or any guarantor, (ii) any
representation, warranty or statement made in or in connection with any of the
Loan Documents, (iii) the financial condition or creditworthiness of the
Borrower or any guarantor, (iv) the performance of or compliance with any of the
terms or provisions of any of the Loan Documents, (v) inspecting any of the
property, books or records of the Borrower, (vi) the validity, enforceability,
perfection, priority, condition, value or sufficiency of any collateral securing
or purporting to secure the Credit Extensions or (vii) any mistake, error of
judgment, or action taken or omitted to be taken in connection with the Credit
Extensions or the Loan Documents.

         7. REPRESENTATIONS AND UNDERTAKINGS OF THE ASSIGNEE. The Assignee (i)
confirms that it has received a copy of the Credit Agreement, together with
copies of the financial statements requested by the Assignee and such other
documents and information as it has deemed appropriate to make its own credit
analysis and decision to enter into this Assignment Agreement, (ii) agrees that
it will, independently and without reliance upon the Administrative Agent, the
Assignor or any other Lender and based on such documents and information at it
shall deem appropriate at the time, continue to make its own credit decisions in
taking or not taking action under the Loan Documents, (iii) appoints and
authorizes the Administrative Agent to take such action as agent on its behalf
and to exercise such powers under the Loan Documents as are delegated to the
Administrative Agent by the terms thereof, together with such powers as are
reasonably incidental thereto, (iv) confirms that the execution and delivery of
this Assignment Agreement by the Assignee is duly authorized, (v) agrees that it
will perform in accordance with their terms all of the obligations which by the
terms of the Loan Documents are required to be performed by it as a Lender, (vi)
agrees that its payment instructions and notice instructions are as set forth in
the attachment to Schedule 1, (vii) confirms that none of the funds, monies,
assets or other consideration being used to make the purchase and assumption
hereunder are "plan assets" as defined under ERISA and that its rights, benefits
and interests in and under the Loan Documents will not be "plan assets" under
ERISA, (viii) agrees to indemnify and hold the Assignor harmless against all
losses, costs and expenses (including, without limitation, reasonable attorneys'
fees) and liabilities incurred by the Assignor in connection with or arising in
any manner from the Assignee's non-performance of the obligations assumed under
this Assignment Agreement, and (ix) if applicable, attaches the forms prescribed
by the Internal Revenue Service of the United States certifying that the
Assignee is entitled to receive payments under the Loan Documents without
deduction or withholding of any United States federal income taxes.

         8. GOVERNING LAW. This Assignment Agreement shall be governed by the
internal law, and not the law of conflicts, of the State of Texas.

<PAGE>   98

         9. NOTICES. Notices shall be given under this Assignment Agreement in
the manner set forth in the Credit Agreement. For the purpose hereof, the
addresses of the parties hereto (until notice of a change is delivered) shall be
the address set forth in the attachment to Schedule 1.

         10. COUNTERPARTS; DELIVERY BY FACSIMILE. This Assignment Agreement may
be executed in counterparts. Transmission by facsimile of an executed
counterpart of this Assignment Agreement shall be deemed to constitute due and
sufficient delivery of such counterpart and such facsimile shall be deemed to be
an original counterpart of this Assignment Agreement.

         IN WITNESS WHEREOF, the duly authorized officers of the parties hereto
have executed this Assignment Agreement by executing Schedule 1 hereto as of the
date first above written.

                  [Remainder of Page Intentionally Left Blank]

<PAGE>   99

                                   SCHEDULE 1
                             to Assignment Agreement

1.       Description and Date of Credit Agreement: Amended and Restated Credit
         Agreement dated as of June 30, 2001 to be effective as of July 2001,
         among Centex Construction Products, Inc., the Lenders named therein,
         Bank of America, N.A., Syndication Agent, PNC Bank, National
         Association, as Documentation Agent, Bank One, NA, as LC Issuer and as
         Administrative Agent

2.       Date of Assignment Agreement: _______________, 200__

3.       Amounts (As of Date of Item 2 above):

<Table>
<Caption>
                                                          Revolving Credit Facility
                                                          -------------------------
<S>                                                       <C>
         a.   Assignee's percentage of
              Revolving Credit Facility
              purchased under the Assignment                            %
              Agreement**                                          -----

         b.   Amount of each Facility purchased
              under the Assignment Agreement
                                                                   $
4.       Assignee's Commitment (or                                  -----
         Outstanding Credit Exposure with
         respect to terminated Commitments)
         purchased hereunder:                                 $
                                                               ---------------
5.       Proposed Effective Date:
                                                              ----------------
</Table>

Accepted and Agreed:

[NAME OF ASSIGNOR]                     [NAME OF ASSIGNEE]

By:                                    By:
   -------------------------------        --------------------------------------
   Name:                                  Name:
        --------------------------             ---------------------------------
   Title:                                 Title:
         -------------------------              --------------------------------

<PAGE>   100

ACCEPTED AND CONSENTED TO BY           ACCEPTED AND CONSENTED TO BY
CENTEX CONSTRUCTION PRODUCTS, INC.     BANK ONE, NA, as Administrative Agent

By:                                    By:
   -------------------------------        --------------------------------------
   Name:                                  Name:
        --------------------------             ---------------------------------
   Title:                                 Title:
         -------------------------              --------------------------------

**   Percentage taken to 10 decimal places

<PAGE>   101

                Attachment to SCHEDULE 1 to ASSIGNMENT AGREEMENT

                        ADMINISTRATIVE INFORMATION SHEET

         Attach Assignor's Administrative Information Sheet, which must
           include notice addresses for the Assignor and the Assignee
                            (Sample form shown below)

                              ASSIGNOR INFORMATION

CONTACT:

Name:                                  Telephone No.:
     -----------------------------                   ---------------------------
Fax No.:                               Telex No.:
        --------------------------               -------------------------------
                                       Answerback:
                                                  ------------------------------

PAYMENT INFORMATION:
                                       -----------------------------------------

                                       -----------------------------------------

                                       -----------------------------------------

Name & ABA # of Destination Bank:
                                       -----------------------------------------

                                       -----------------------------------------

                                       -----------------------------------------

Account Name & Number for Wire Transfer:
                                       -----------------------------------------

                                       -----------------------------------------

                                       -----------------------------------------

Other Instructions:
                   -------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

ADDRESS FOR NOTICES FOR ASSIGNOR:
                                       -----------------------------------------

                                       -----------------------------------------

                                       -----------------------------------------

                              ASSIGNEE INFORMATION

CREDIT CONTACT:

Name:                                  Telephone No.:
     -----------------------------                   ---------------------------
Fax No.:                               Telex No.:
        --------------------------               -------------------------------
                                       Answerback:
                                                  ------------------------------

<PAGE>   102

KEY OPERATIONS CONTACTS:

Booking Installation:                      Booking Installation:
                     -----------------                          ----------------
Name:                                      Name:
     ---------------------------------          --------------------------------
Telephone No.:                             Telephone No.:
              ------------------------                   -----------------------
Fax No.:                                   Fax No.:
        ------------------------------             -----------------------------
Telex No.:                                 Telex No.:
          ----------------------------               ---------------------------
Answerback:                                Answerback:
           ---------------------------                --------------------------

PAYMENT INFORMATION:

Name & ABA # of Destination Bank:
                                           -------------------------------------

                                           -------------------------------------

                                           -------------------------------------

Account Name & Number for Wire Transfer:
                                           -------------------------------------

                                           -------------------------------------

                                           -------------------------------------

Other Instructions:
                   -------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

ADDRESS FOR NOTICES FOR ASSIGNEE:
                                           -------------------------------------

                                           -------------------------------------

                                           -------------------------------------

                              BANK ONE INFORMATION

      Assignee will be called promptly upon receipt of the signed agreement.

INITIAL FUNDING CONTACT:                   SUBSEQUENT OPERATIONS CONTACT:

Name:                                      Name:
     --------------------------------           --------------------------------
Telephone No.: (312)                       Telephone No.: (312)
              -----------------------                    -----------------------
Fax No.: (312)                             Fax No.: (312)
        -----------------------------              -----------------------------

                                           Bank One Telex No.: 190201
                                                              ------------------
                                           Answerback: FNBC UT
                                                      --------------------------
INITIAL FUNDING STANDARDS:

Libor - Fund 2 days after rates are set.

BANK ONE WIRE INSTRUCTIONS:                Bank One, NA, ABA # 071000013
                                           LS2 Incoming Account # 481152860000
                                           Ref:
                                               ---------------------------------

<PAGE>   103

ADDRESS FOR NOTICES FOR BANK ONE:       1 Bank One Plaza
                                        Chicago, IL 60670
                                        Attn: Agency Compliance Division
                                              Suite IL1-0353
                                        Fax No. (312) 732-2038 or (312) 732-4339
<PAGE>   104
                                    EXHIBIT D

                 LOAN/CREDIT RELATED MONEY TRANSFER INSTRUCTION

To Bank One, NA,
as Administrative Agent (the "Administrative Agent")
under the Credit Agreement described below.

Re:      Amended and Restated Credit Agreement, dated as of June 30, 2001 to be
         effective July 20, 2001 (as the same may be amended or modified, the
         "Credit Agreement"), among Centex Construction Products, Inc., a
         Delaware corporation (the "Borrower"), the Lenders named therein, the
         LC Issuer, the Syndication Agent, the Documentation Agent and the
         Administrative Agent. Capitalized terms used herein and not otherwise
         defined herein shall have the meanings assigned thereto in the Credit
         Agreement.

         The Administrative Agent is specifically authorized and directed to act
upon the following standing money transfer instructions with respect to the
proceeds of Advances or other extensions of credit from time to time until
receipt by the Administrative Agent of a specific written revocation of such
instructions by the Borrower, provided, however, that the Administrative Agent
may otherwise transfer funds as hereafter directed in writing by the Borrower in
accordance with Section 13.1 of the Credit Agreement or based on any telephonic
notice made in accordance with Section 2.14 of the Credit Agreement.

Facility Identification Number(s)
                                  ----------------------------------------------

Customer/Account Name
                      ----------------------------------------------------------

Transfer Funds To
                 ---------------------------------------------------------------

                 ---------------------------------------------------------------

For Account No.
               -----------------------------------------------------------------

Reference/Attention To
                      ----------------------------------------------------------

Authorized Officer (Customer Representative)       Date
                                                       -------------------------

-------------------------                          -----------------------------
(Please Print)                                     Signature

<PAGE>   105

Bank Officer Name                                  Date
                                                       -------------------------

-------------------------                          -----------------------------
(Please Print)                                     Signature

    (Deliver Completed Form to Credit Support Staff For Immediate Processing)

<PAGE>   106

                                   EXHIBIT E

                                     NOTE

                                                                   July 20, 2001

         Centex Construction Products, Inc., a Delaware corporation (the
"Borrower"), promises to pay to the order of _______________________ (the
"Lender") the aggregate unpaid principal amount of all Loans made by the Lender
to the Borrower pursuant to Article II of the Agreement (as hereinafter
defined), in immediately available funds at the main office of Bank One, NA in
Dallas, Texas, as Administrative Agent, together with interest on the unpaid
principal amount hereof at the rates and on the dates set forth in the
Agreement. The Borrower shall pay the principal of and accrued and unpaid
interest on the Loans in full on the Facility Termination Date.

         The Lender shall, and is hereby authorized to, record on the schedule
attached hereto, or to otherwise record in accordance with its usual practice,
the date and amount of each Loan and the date and amount of each principal
payment hereunder.

         This Note is one of the Notes issued pursuant to, and is entitled to
the benefits of, the Amended and Restated Credit Agreement dated as of June 30,
2001 to be effective July 20, 2001 (which, as it may be amended or modified and
in effect from time to time, is herein called the "Agreement"), among the
Borrower, the lenders party thereto, including the Lender, Bank of America,
N.A., as Syndication Agent, PNC Bank, National Association, as Documentation
Agent, Bank One, NA, as LC Issuer and as Administrative Agent, to which
Agreement reference is hereby made for a statement of the terms and conditions
governing this Note, including the terms and conditions under which this Note
may be prepaid or its maturity date accelerated. This Note is guaranteed
pursuant to the Guaranty, all as more specifically described in the Agreement,
and reference is made thereto for a statement of the terms and provisions
thereof. Capitalized terms used herein and not otherwise defined herein are used
with the meanings attributed to them in the Agreement.

                                          CENTEX CONSTRUCTION PRODUCTS, INC.

                                          By:
                                             -----------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------

<PAGE>   107

                   SCHEDULE OF LOANS AND PAYMENTS OF PRINCIPAL
                                       TO
                   NOTE OF CENTEX CONSTRUCTION PRODUCTS, INC.
                               DATED JULY 20, 2001

<Table>
<Caption>

              Principal           Maturity            Principal
              Amount of          of Interest           Amount           Unpaid
Date            Loan               Period               Paid            Balance
----          ---------          -----------          ---------         -------
<S>           <C>                <C>                  <C>               <C>

</Table><PAGE>   1
                                                                   EXHIBIT 10.20

                       NONQUALIFIED STOCK OPTION AGREEMENT

         THIS NONQUALIFIED STOCK OPTION AGREEMENT is entered into as of June 19,
2001 between Uranium Resources, Inc., a Delaware corporation (the "Company"),
and Leland O. Erdahl, an individual (the "Optionee").

                                    RECITALS:

         A. The Company desires to grant an option to Optionee to purchase
shares of the Company's common stock; and

         B. Optionee desires to accept such option.

         NOW, THEREFORE, in consideration of the foregoing and the mutual
promises set forth herein, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties agree as
follows:

         1. Grant of Option.

                  The Company hereby grants to Optionee an irrevocable option to
purchase up to 100,000 shares of the Common Stock of the Company (the "Shares")
at a price of $0.22 per share.

         2. Term of Option.

                  This option shall expire, terminate, and be of no further
force and effect upon the earliest to occur of the following (the "Expiration
Date"): (a) at 5:00 p.m., Central Time, on June 18, 2011; (b) on the thirtieth
day after the Optionee ceases to be a director of the Company, if the Optionee
ceases to be a director of the Company for any reason other than removal for
cause or death; (c) if the Optionee is removed as a director for cause, at the
time of such removal; or (d) if the Optionee dies before this option otherwise
expires, this option shall be exercisable for a period of one year after the
date of death by the Optionee's heirs or legal representatives to the same
extent it was exercisable by the Optionee on the date of death.

         3. Exercise of Option.

                  This option shall be exercised at any time prior to the
Expiration Date by delivery of written notice to the Company setting forth the
number of Shares with respect to which this option is being exercised and the
address to which the certificates representing the Shares shall be mailed. In
order to be effective, such written notice shall be accompanied at the time of
its delivery to the Company by payment by certified check or by bank cashier's
check payable to the Company of the option price of such Shares. In addition,
the Optionee hereby agrees to pay to the Company at the time such written notice
of exercise is delivered to the Company any federal, state, or local taxes which
the Company deems necessary or appropriate to be withheld in connection with the
exercise of the option granted hereunder. As promptly as practicable after the
receipt by the Company of the foregoing, the Company shall cause to be delivered
to the Optionee a certificate or certificates representing the number of Shares
with respect to which this option has been so exercised.

                                       1
<PAGE>   2

         4. Reserved Shares.

                  The Company has duly reserved for issuance a number of
authorized but unissued shares adequate to fulfill its obligations under this
agreement. During the term of this agreement the Company shall take such action
as may be necessary to maintain at all times an adequate number of shares
reserved for issuance or treasury shares to fulfill its obligations hereunder.

         5. Assignment or Transfer.

                  This option may not be assigned or transferred without the
prior written consent of the Company.

         6. Compliance with Law.

                  This option shall not be exercised, and no Shares shall be
issued in respect hereof, unless (a) in compliance with federal and applicable
state securities or other laws and (b) the Company obtains any approval or other
clearance from any federal or state governmental agency which the Company in its
sole discretion shall determine to be necessary or advisable. Any determination
in this connection by the Company shall be final, binding, and conclusive on all
parties.

         7. Legends and Representations.

                  (a) The certificates evidencing Shares purchased pursuant to
this option shall bear the following legends:

                  THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN
                  REGISTERED UNDER THE SECURITIES ACT OF 1933 AND MAY NOT BE
                  SOLD, TRANSFERRED, ASSIGNED OR HYPOTHECATED UNLESS THERE IS AN
                  EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT COVERING SUCH
                  SECURITIES OR THE COMPANY RECEIVES AN OPINION OF COUNSEL FOR
                  THE HOLDER OF THESE SECURITIES REASONABLY SATISFACTORY TO THE
                  COMPANY AND ITS COUNSEL STATING THAT SUCH SALE, TRANSFER,
                  ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION
                  AND PROSPECTUS DELIVERY REQUIREMENTS OF SUCH ACT.

                  THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER
                  WHO SO REQUESTS, THE POWERS, DESIGNATIONS, PREFERENCES AND
                  RELATIVE, PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF
                  EACH CLASS OF STOCK OR SERIES THEREOF AND THE QUALIFICATIONS,
                  LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR RIGHTS.

                  (b) Upon delivery of the Notice specified in Section 3 above
and as a condition to the exercise of this option, Optionee shall be deemed to
have made the following representations to the Company:

                           (1) Investment Intent; Capacity to Protect Interests.
Optionee is receiving the Shares solely for Optionee's own account for
investment and not with a view to or for sale in connection with any
distribution and not with any present intention of selling, offering to sell or
otherwise disposing of or distributing thereof in any transaction other than a
transaction exempt from registration under the Securities Act of 1933, as
amended (the "Act"). Optionee is experienced in evaluating and investing in
companies such as the Company.

                           (2) Information Concerning the Company. Optionee has
received all such information as Optionee has deemed necessary and appropriate
to evaluate an investment in the Shares, and Optionee has received satisfactory
and complete information concerning the business and financial condition of the
Company in response to all inquiries in respect thereof.

                           (3) Restricted Securities. Optionee understands and
acknowledges that:

                                       2
<PAGE>   3

                                    (a) The Shares have not been registered
under the Act, and the Shares must be held indefinitely unless subsequently
registered under the Act or an exemption from such registration is available and
the Company is under no obligation to register the Shares;

                                    (b) the share certificate representing the
Shares will be stamped with legends specified in Section 7(a) hereof; and

                                    (c) the Company will make a notation in its
records of the aforementioned restrictions on transfer and legends.

                           (4) Further Limitations on Disposition. Without in
any way limiting his representations set forth above, Optionee further agrees
that he shall in no event make any disposition of all or any portion of the
Shares unless and until:

                                    (a) there is then in effect a registration
statement under the Act covering such proposed disposition and such disposition
is made in accordance with said registration statement; or

                                    (b)(1) Optionee shall have notified the
Company of the proposed disposition and shall have furnished the Company with a
detailed statement of the circumstances surrounding the proposed disposition,
(2) Optionee shall have furnished the Company with an opinion of Optionee's
counsel to the effect that such disposition will not require registration of
such Shares under the Act, and (3) such opinion of Optionee's counsel shall have
been concurred in by counsel for the Company and the Company shall have advised
Optionee of such concurrence.

         8. Notice.

                  All notices or other communications desired to be given
hereunder shall be in writing and shall be deemed to have been duly given upon
receipt, if personally delivered, or on the third business day following mailing
by United States first class mail, postage prepaid, and addressed as follows:

If to the Company:                  Paul Willmott, President
                                    Uranium Resources, Inc.
                                    650 South Edmonds, Suite 108
                                    Lewisville, TX 75067

If to Optionee:                     Leland O. Erdahl

or to such other address as either party shall give to the other in the manner
set forth above.

         9. Tax Treatment. Optionee acknowledges that the tax treatment of this
option, Shares subject to this option or any events or transactions with respect
thereto may be dependent upon various factors or events which are not determined
by this Agreement. The Company makes no representations with respect to and
hereby disclaims all responsibility as to such tax treatment.

         10. Nonqualified Status. This option is not intended to be an
"Incentive Stock Option" as defined in Section 422 of the Internal Revenue Code
of 1986, as amended, and it shall not be treated as an Incentive Stock Option,
whether or not, by its terms, it meets the requirements of Section 422.

         11. Adjustments. The number of shares of Common Stock covered by the
Option, as well as the price per share of Common Stock covered by the Option,
shall be proportionately adjusted for any increase or decrease in the number of
issued and outstanding shares of Common Stock resulting from a stock split,
reverse stock split, stock

                                       3
<PAGE>   4

dividend, combination or reclassification of the Common Stock of the Company.
Such adjustment shall be made by the Board, whose determination in that respect
shall be final, binding and conclusive.

                  In the event of the proposed merger or consolidation of the
Company or dissolution or liquidation of the Company, the Board shall notify the
Optionee at least fifteen (15) days prior to such proposed action. To the extent
it has not been previously exercised, the option will terminate immediately
prior to the consummation of such proposed action.

         IN WITNESS WHEREOF, the Company and Optionee have executed this Stock
Option Agreement effective as of the date first set forth above.

                                       URANIUM RESOURCES, INC.

                                       By:
                                          --------------------------------------
                                          Paul K. Willmott, President

                                       -----------------------------------------
                                       Leland O. Erdahl

                                       4

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