EXHIBIT 10(c)



                  USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN

             (As Amended and Restated Effective as of July 1, 1997)




                             McDermott, Will & Emery
                                Chicago, Illinois



                  USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN


                                    SECTION 1

                                  Introduction

1.1.  The Plan,  the Company.  Effective  January 1, 1976 UNITED  STATES  GYPSUM
COMPANY  established UNITED STATES GYPSUM COMPANY  SUPPLEMENTAL  RETIREMENT PLAN
(the  "Plan").  On  January  1,  1985  UNITED  STATES  GYPSUM  COMPANY  became a
wholly-owned  subsidiary  of USG  CORPORATION  and effective as of that date USG
CORPORATION  was  substituted  for UNITED STATES GYPSUM COMPANY as the "Company"
under  the  Plan  and the  name  of the  Plan  was  changed  to USG  CORPORATION
SUPPLEMENTAL  RETIREMENT  PLAN.  The term  "Company"  as used in the Plan  means
UNITED STATES GYPSUM COMPANY up to January 1, 1985 and USG CORPORATION  (and any
successor thereto) on and after that date. The provisions of this subsection and
the following  provisions of the Plan constitute an amendment and restatement of
the  Plan,  as  previously  amended,  effective  as of July 1,  1997  (the  "New
Effective Date"), subject to any subsequent amendments.


1.2.  Employers.  Each  subsidiary of the Company that is an employer  under USG
Corporation  Retirement  Plan (the  "Retirement  Plan") or under USG Corporation
Investment Plan (the  "Investment  Plan") shall be an "Employer" under this Plan
unless  specified  to the  contrary  by the  Company by  writing  filed with the
Committee described in subsection 1.4.


1.3.  Purpose.  The  Company and certain of its  subsidiaries  maintain  and are
employers under the Retirement Plan and the Investment Plan, each of which plans
is intended to meet the  requirements of a "qualified plan" under Section 401(a)
of the Internal Revenue Code. The purpose of this Plan, a nonqualified  plan, is
to provide for eligible  employees benefits that could have been earned and paid
under the Retirement and Investment Plans and under any other qualified  defined
benefit and defined  contribution  plans  maintained by the controlled  group of
corporations  of which the Company is a member  ("other USG Defined  Benefit and
Defined Contribution Plans") but for the following limitations:

     (a)  Section   401(a)(4)  of  the  Internal   Revenue  Code  requires  that
contributions or benefits  provided under a qualified plan must not discriminate
in favor of highly  compensated  employees  and  therefore  amounts  deferred by
employees,  if  any,  under  the  Company's  management  incentive  compensation
programs  until their  retirement or other  termination of employment may not be
considered as a part of their employment  compensation in determining the amount
of their  contributions,  benefits provided with respect to their contributions,
and employer  provided  benefits under the  Retirement and Investment  Plans and
other USG Defined Benefit and Defined Contribution Plans.

     (b) Sections  401(a)(17) and 404(l) of the Internal  Revenue Code limit the
amount of  employees'  annual  compensation  that may be taken  into  account in
determining  the  benefits  that  may be paid to them  from the  Retirement  and
Investment  Plans and other USG Defined Benefit and Defined  Contribution  Plans
and the  deductible  Employer  contributions  that may be made to those plans to
provide such benefits.

     (c) Sections  401(k) and 401(m) of the  Internal  Revenue Code require that
employees'  before-tax  contributions and Employer matching  contributions under
USG Defined  Contribution Plans be tested to prevent  discrimination in favor of
highly compensated employees and as a result of such tests employees' before-tax
contributions and shares of Employer matching contributions under such plans may
be limited.

     (d)  Section  402(g) of the  Internal  Revenue  Code  limits  the amount of
before-tax contributions that an employee may make under the Investment Plan and
other USG Defined Contribution Plans.

     (e) Section 415 of the  Internal  Revenue  Code places  limitations  on the
amount of benefits that may be paid from and  contributions  that may be made to
the Retirement  Plan and the Investment  Plan and other USG Defined  Benefit and
Defined Contribution Plans.

The Plan also allows  Participants to elect to make before-tax  contributions to
the Plan in excess of the amount of  contributions  permitted under the terms of
the  Investment  Plan. In no event shall any benefits be payable under this Plan
that would  duplicate  benefits that become payable under any other qualified or
nonqualified  plan  maintained by the Company,  any other  Employer or any other
member of the controlled group of corporations of which the Company is a member.


1.4.  Plan  Administration.  The  Plan is  administered  by the  committee  (the
"Committee")  that is responsible for  administration of the Retirement Plan and
the Investment Plan. To the extent  appropriate,  the Committee has,  concerning
Part A Supplemental Benefits and Part A Supplemental Death Benefits described in
Section 3, the same  powers,  rights,  duties and  obligations  it has as to the
Retirement  Plan  and,  concerning  Part  B  Supplemental  Benefits  and  Part B
Supplemental  Death  Benefits  described in Section 4, the same powers,  rights,
duties and obligations it has as to the Investment Plan,  including the right to
require the  completion  of such forms or  applications  with respect to benefit
payments as it deems appropriate.


1.5. Preservation of Benefits.  Benefits shall be provided under the Plan on and
after the New  Effective  Date to, or with respect to,  former  employees of the
Company who became entitled to such benefits before that date in accordance with
the  terms of the Plan as in  effect  at the time of their  retirement  or other
termination of employment.  If an employee of an Employer was  participating  in
the  Plan  immediately  prior  to  the  New  Effective  Date  and  continues  to
participate in the Plan on and after that date, benefits payable under Section 3
of this Plan to, or with respect to, such  employee  shall not be less than what
they  would  have  been if the Plan as in  effect  immediately  prior to the New
Effective  Date continued in effect on and after that date without  change,  but
only taking into account for this purpose benefits accrued by the employee under
the  Retirement  Plan and all other USG Defined  Benefit  Plans prior to the New
Effective  Date,  and benefits  payable under Section 4 of this Plan to, or with
respect  to,  such  employee  shall not be less than his  account  described  in
subsection  4.6  determined  as of the New  Effective  Date and as  subsequently
adjusted pursuant to subsection 4.6 to reflect deemed investment of the account.


                                    SECTION 2

                          Eligibility for Participation


2.1.  Covered  Employee.  A "Covered  Employee" means an employee of an Employer
under the Plan who is a highly compensated employee as defined in Section 414(q)
of the Internal Revenue Code, unless the Committee  specifies that such employee
shall not be  considered  as a Covered  Employee  for any purpose of the Plan by
writing  filed with the  Secretary  of the  Company  prior to, or within 30 days
after, the date the employee  otherwise would become eligible for  participation
in the Plan.


2.2.  Eligibility.  Subject to the conditions and  limitations of the Plan, each
employee of an  Employer  who was a  "Participant"  in the Plan on June 30, 1997
shall  continue  as a  Participant  in the Plan after that date.  Subject to the
conditions and limitations of the Plan, each other employee of an Employer shall
become eligible to enroll in this Plan and become a  "Participant"  on the first
date occurring on or after the New Effective Date on which:

     (a) he is a Covered Employee; and

     (b) the benefits he accrues, or the contributions he is required to make or
could elect to make, or his share of employer derived contributions under one or
more of the Retirement  Plan, the Investment Plan, and other USG Defined Benefit
and Defined  Contribution Plans, are less than what they would have been (or, as
to  elected  contributions,  could  have  been) as a result  of the  limitations
described in subsection 1.3.

Each  employee will be notified of the date he is eligible to enroll in the Plan
and become a  Participant  and will be  notified  of the  enrollment  procedures
established by the Committee.


2.3.  Period  of  Participation.  An  employee  of an  Employer  who  becomes  a
Participant  in  this  Plan  will  continue  as a  Participant  in the  Plan  in
accordance with its provisions  until all benefits to which he is entitled under
the Plan  have been  distributed  to him.  However,  a  Participant  will not be
entitled to make contributions or accrue additional  benefit  entitlements under
this Plan for any period during which he is not a Covered Employee.


                                    SECTION 3

                          Part A Supplemental Benefits


3.1.  Intent.  The Employers  intend that  benefits be provided  pursuant to the
provisions  of this Section 3 that are  actuarially  equivalent  to the benefits
that would have been provided  under the  Retirement  Plan and other USG Defined
Benefit Plans if the  limitations  described in subsection 1.3 did not exist, if
before-tax  contributions  the Participant  makes pursuant to subsection 3.3 had
been made under the Retirement Plan and any other applicable USG Defined Benefit
Plan on an after-tax basis, and if amounts deferred under the Company's 1989 and
subsequent   management  incentive   compensation  programs  or  deferred  under
subsections  4.3 and 4.4 of the Plan had not been  deferred  but instead paid at
the proper time and  included in  employment  compensation  for  purposes of the
Plans, provided that the contribution requirement described in subsection 3.3 is
met.


3.2. Limited Benefits, Unlimited Benefits, Part A Supplemental Benefits and Part
A Supplemental Death Benefits. For purposes of this Section 3, the term "Limited
Benefits"  means the  benefits  that  become  payable  to or with  respect  to a
Participant  under the Retirement  Plan and all other USG Defined Benefit Plans.
The term "Unlimited  Benefits" means the benefits that would have become payable
to or  with  respect  to a  Participant  under  such  Plans  if the  limitations
described in  subsection  1.3 did not exist,  if  before-tax  contributions  the
Participant  makes pursuant to subsection 3.3 had been made under the Retirement
Plan and any other  applicable USG Defined  Benefit Plan on an after-tax  basis,
and if  amounts  deferred  by the  Participant  under  the  Company's  1989  and
subsequent   management  incentive   compensation  programs  or  deferred  under
subsections  4.3 and 4.4 of the Plan had not been  deferred  but instead paid to
the  Participant  at the proper time during  employment and then included in the
Participant's employment compensation for purposes of those Plans. Benefits that
become payable under this Section 3 to a Participant  are referred to as "Part A
Supplemental Benefits". Benefits that become payable under this Section 3 to any
person as a result  of the death of a  Participant  are  referred  to as "Part A
Supplemental Death Benefits".


3.3. Participant Contribution Requirement. A Participant's entitlement to Part A
Supplemental  Benefits  and Part A  Supplemental  Death  Benefits  described  in
subsections  3.5  and  3.7 is  subject  to  the  Participant  making  before-tax
contributions  under  this Plan.  Such  contributions  must equal the  after-tax
contributions  the  Participant  would  have  been  required  to make  under the
Retirement Plan and all other USG Defined Benefit Plans:

     (a) if amounts  contributed on a before-tax basis under this Plan, deferred
by  the  Participant  under  the  Company's  management  incentive  compensation
programs,  or deferred under subsections 4.3 and 4.4 of the Plan had not been so
contributed  or deferred but paid to the  Participant  at the proper time during
employment and then included in the  Participant's  employment  compensation for
purposes of those plans;

     (b) if the annual compensation  limitation imposed by Section 401(a)(17) of
the Internal Revenue Code (as described in subparagraph 1.3(b)) did not apply to
the Participant; and

     (c) if the  limitations  imposed under Section 415 of the Internal  Revenue
Code (as described in subparagraph 1.3(f)) did not apply to the Participant.

Notwithstanding  the  foregoing,  a  Participant  may be  eligible  for and make
after-tax contributions under the Retirement Plan or another USG Defined Benefit
Plan even though the limitations  described above in this subsection may prevent
or limit his accrual of benefits under such plans. In such case, the Participant
will accrue benefits under this Plan based on such after-tax contributions as if
they had been made under this Plan on a before-tax  basis.  The Committee  shall
maintain  a  bookkeeping  account  in the  name of each  Participant  who  makes
before-tax  contributions  under this  subsection to reflect such  contributions
and, where required, interest on such contributions. The term "interest" as used
in this Plan with respect to Participants'  before-tax  contributions made under
this  subsection  shall mean  "interest" as defined in the Retirement  Plan with
respect to  participant  contributions  under that plan but shall not  include a
higher rate of interest  required to be applied  under the  Retirement  Plan for
certain purposes pursuant to Section 411(c)(2) of the Internal Revenue Code.


3.4. Compensation Deferral Elections. A Participant's  before-tax  contributions
under this Section 3 shall be made pursuant to a compensation  deferral election
filed with his Employer  prior to the calendar  year such  contributions  are to
begin or, in the case of a Participant  who first becomes  eligible to make such
contributions  during but after the beginning of a calendar year, filed with his
Employer  not more  than 30 days  after so  becoming  eligible,  subject  to the
following:

     (a) The  Participant's  election  shall  apply to  employment  compensation
otherwise  payable after the later to occur of the date the Participant  becomes
eligible to make  before-tax  contributions  and the date the  election is filed
with his Employer.

     (b) Such election shall be automatically  revoked if the Participant ceases
to be a Covered Employee and such revocation shall be effective as to employment
compensation  the Participant is entitled to receive during the period he ceases
to be a Covered Employee.

     (c) Such election may be voluntarily  revoked by the Participant before the
beginning  of any  subsequent  calendar  year. A voluntary  revocation  shall be
effective as to employment  compensation  the Participant is entitled to receive
during that and subsequent  calendar years unless prior to the  commencement  of
any subsequent calendar year the Participant makes another compensation deferral
election.  Such  later  election  shall  apply  as  to  employment  compensation
otherwise payable during calendar years beginning after the election is made.

Any period during which a Participant does not make contributions under the Plan
(and, where applicable, does not elect to make after-tax contributions under the
Retirement  Plan or another USG Defined  Benefit Plan upon which  benefits would
accrue  under this Plan) shall be  disregarded  for  purposes of any  subsequent
calculation  of benefit  service (as defined in subsection 4.3 of the Retirement
Plan) or  compensation  (as  described in  subsection  3.3 above for purposes of
determining contributions under this Plan) used in determining the Participant's
Unlimited Benefits for a subsequent Plan year.


3.5.  Amount  of  Part A  Supplemental  Benefits.  Subject  to the  contribution
requirement  described in subsection  3.3, Part A  Supplemental  Benefits  shall
become payable under the Plan to a Participant upon the Participant's retirement
or earlier  termination of employment with the Company and its  subsidiaries.  A
Participant's  Part A  Supplemental  Benefits  shall  be in an  amount  that  is
actuarially  equivalent  to the  amount  by which  the  Participant's  Unlimited
Benefits exceed the Participant's Limited Benefits. For purposes of this Section
3,  actuarially  equivalent  benefits  shall be  calculated  on the basis of the
actuarial  factors,  assumptions  and tables  applied for that purpose under the
Retirement Plan, to the extent deemed appropriate by the Committee.


3.6. Payment of Part A Supplemental Benefits.  Subject to the provisions of this
subsection 3.6, Part A Supplemental  Benefits shall be paid in a lump sum within
30 days after such  benefits  become  payable  or, if the entire  amount of such
benefits  cannot be  determined  by the  Committee  within  that 30 day  period,
payment shall be made in one or more installments as determined by the Committee
but with the last payment due by the 30th day  following  the date the Committee
determines  the total amount of such  benefits.  The Committee in its discretion
may from time to time establish  rules  incorporating  objective  standards that
shall govern the form of payment of Part A Supplemental  Benefits that initially
become  payable  during  a  subsequent  calendar  year.  A copy of  such  rules,
certified by the Chairman or Secretary of the Committee, shall be filed with the
Secretary of the Company  before the  beginning  of the calendar  year for which
they first become effective. Any such rules in effect at the start of a calendar
year may not be modified or rescinded in that calendar  year or thereafter  with
respect to the form of payment of Part A  Supplemental  Benefits that  initially
become  payable  to any  person  under  the  Plan  during  that  calendar  year.
Notwithstanding the foregoing provisions of this subsection:

     (a) Payment of a Participant's Part A Supplemental Benefits must be made or
commence  not later than  February 1 of the  calendar  year next  following  the
calendar year in which he attains age 65 years or, if later,  his termination of
employment with the Company and its subsidiaries occurs.

     (b)  If  the  Committee   determines  that  a  Participant   whose  Part  A
Supplemental  Benefits  are  being  paid over a period of more than one year has
incurred  a severe  financial  hardship  as a  result  of the  occurrence  of an
unanticipated event beyond the Participant's  control,  the Committee may direct
that an  advance  payment  of part or all of the  Covered  Participant's  Part A
Supplemental  Benefits  be made,  but the  amount  thereof  shall not exceed the
amount needed for such financial hardship.

     (c) If a Change in Control as determined in accordance  with the provisions
of  Section 18 of the  Retirement  Plan as in effect on the New  Effective  Date
should occur,  Part A Supplemental  Benefits that initially  became payable to a
Participant  before the Change in Control but have not been paid or paid in full
shall be  distributed  in accordance  with the same form of payment as in effect
with respect to those benefits  immediately prior to the Change in Control,  but
any Part A Supplemental  Benefits that initially become payable after the Change
in Control shall be  distributed  in a lump sum to the person  entitled  thereto
within 30 days after they become payable.

     (d) If a  Participant's  death occurs while  employed by the Company or any
subsidiary of the Company or if a Participant's death occurs after he had become
entitled to Part A Supplemental Benefits but before payment of such benefits has
commenced or has been  completed,  Part A  Supplemental  Death Benefits shall be
payable with respect to the  Participant  only if and to the extent  provided in
subsection 3.7.

     (e) Spousal consent rules that apply under the Retirement Plan or any other
USG Defined  Benefit Plan with respect to forms of payment of benefits shall not
apply under this Plan.


3.7.  Amount  and  Payment  of  Part  A  Supplemental  Death  Benefits.  Part  A
Supplemental Death Benefits shall be payable under the Plan as follows:

     (a) If a  Participant's  death  occurs  while  employed by the Company or a
subsidiary  of the  Company  and if he had an  Eligible  Spouse  (as  defined in
subsection  5.1)  immediately  prior to his death,  the  Participant's  Eligible
Spouse shall be entitled to a lump sum Part A  Supplemental  Death Benefit under
this Plan  which is  actuarially  equivalent  (based on the age of the  Eligible
Spouse) to any additional monthly pre-retirement  survivor annuity benefits that
would  have  been  payable  to  the  Participant's  Eligible  Spouse  under  the
Retirement  Plan and all other USG Defined  Benefit  Plans if the  Participant's
Limited Benefits equalled his Unlimited Benefits.  The Part A Supplemental Death
Benefit  under  this  subparagraph  3.7(a)  shall  be paid to the  Participant's
Eligible  Spouse in a lump sum as soon as  practicable  after the  Participant's
death.  If the  Participant  did not have an Eligible  Spouse at the time of his
death,  no Part A  Supplemental  Death  Benefits shall be payable under the Plan
with  respect  to that  Participant  other  than  payment  to the  Participant's
Supplemental  Plan Beneficiary (as defined in subsection 5.2) of an amount equal
to the Participant's  before-tax  contributions  under the Plan with interest as
soon as practicable after the Participant's death.

     (b) If a Participant's death occurs after he had both retired (or otherwise
terminated  employment) and become entitled to Part A Supplemental  Benefits but
before payment of such benefits had been made or had commenced, and if he had an
Eligible  Spouse at the time of his death,  the  Participant's  Eligible  Spouse
shall be  entitled  to a lump sum Part A  Supplemental  Death  Benefit  which is
actuarially  equivalent  (based  on  the  age  of the  Eligible  Spouse)  to any
additional monthly pre-retirement survivor annuity benefits that could have been
payable to the  Participant's  Eligible Spouse under the Retirement Plan and all
other USG Defined Benefit Plans if the  Participant's  Limited Benefits equalled
his  Unlimited  Benefits.  The Part A  Supplemental  Death  Benefit  under  this
subparagraph 3.7(b) shall be paid to the Participant's Eligible Spouse in a lump
sum as soon as practicable after the Participant's Death. If the Participant did
not have an  Eligible  Spouse at the time of his death,  no Part A  Supplemental
Death Benefits shall be payable under the Plan with respect to that  Participant
other than payment to the  Participant's  Supplemental  Plan  Beneficiary  of an
amount equal to the Participant's  before-tax contributions under this Plan with
interest as soon as practicable after the Participant's death.

     (c) If a  Participant's  death occurs while  receiving  Part A Supplemental
Benefits,  his  Supplemental  Plan  Beneficiary  shall  be  entitled  to  Part A
Supplemental  Death Benefits equal to the death benefits,  if any, payable under
the form of payment of his Part A Supplemental Benefits.


                                    SECTION 4

                          Part B Supplemental Benefits


4.1.  Intent.  The  provisions  of  this  Section  4 are  intended  to  allow  a
Participant  to  elect  to  make  part  or  all  of  the  additional  before-tax
contributions  he could  have made under the  Investment  Plan and all other USG
Defined  Contribution Plans, and to earn the additional  matching  contributions
that would have been made by his Employer  and  credited to his  accounts  under
those  plans as a result of such  additional  before-tax  contributions,  if the
limitations described in subsection 1.3 did not exist and if amounts contributed
on a before-tax  basis under this Plan or deferred by the Participant  under the
Company's 1989 and subsequent management incentive compensation programs had not
been so  contributed  or deferred  but instead  paid to the  Participant  at the
proper time during employment and then included in the Participant's  employment
compensation  for  purposes  of  those  plans.   This  Section  4  also  permits
Participants to make additional  before-tax  contributions to the Plan in excess
of the amount permitted under the terms of the Investment Plan and to select one
or more deemed investments, the investment experience of which will be the basis
or index by which his accounts will be adjusted under this Plan.


4.2.  Part B  Supplemental  Benefits  and Part B  Supplemental  Death  Benefits.
Benefits that become payable under this Section 4 to a Participant  are referred
to as  "Part  B  Supplemental  Benefits"  or as  "Supplemental  Investment  Plan
Benefits."  Benefits that become payable under this Section 4 to any person as a
result of the death of a  Participant  are  referred to as "Part B  Supplemental
Death Benefits" or as "Supplemental Investment Plan Benefits."


4.3. Elective Participant Contributions. A Participant may elect to make part or
all of the additional  before-tax  contributions  described in subsection 4.1. A
Participant's  before-tax  contributions under this subsection 4.3 shall be made
by a compensation deferral election that is made in such form and in such manner
as the Committee shall determine; provided any such election shall be made prior
to the calendar year such  contributions are to begin, or if a Participant first
becomes eligible to make such contributions  after the beginning of any calendar
year,  not  more  than 30 days  after  so  becoming  eligible.  A  Participant's
compensation  deferral  election  under  this  subsection  4.3  shall  apply  to
employment  compensation  otherwise payable after the later to occur of the date
the Participant  becomes eligible to make before-tax  contributions and the date
the  compensation  deferral  election  is  made.  A  Participant's  compensation
deferral election may be revoked by the Participant  before the beginning of any
subsequent  calendar year.  The  revocation  shall be effective as to employment
compensation  the  Participant is entitled to receive during that and subsequent
calendar years unless prior to the commencement of any subsequent  calendar year
the  Participant  makes  another  compensation  deferral  election.  Such  later
election  shall apply as to employment  compensation  otherwise  payable  during
calendar years beginning after such later election is made.  Notwithstanding the
foregoing, a Participant's compensation deferral election automatically shall be
revoked for any period he ceases to be a highly compensated  employee as defined
in Section 414(q) of the Internal Revenue Code.


4.4. Additional Elective Participant Contributions.  A Participant who is making
the maximum permitted deferral under subsection 4.3 may elect to make additional
before-tax  contributions  pursuant  to this  subsection  4.4.  Such  additional
contributions  shall  be a  percentage  (in  whole  number  increments)  of  the
Participant's employment compensation which, when added to the percentage of the
Participant's  before-tax  contributions to this Plan pursuant to subsection 4.3
and to the Investment Plan and all other USG Defined  Contribution  Plans, shall
not exceed twenty percent. A Participant's  before-tax  contributions under this
subsection  4.4 shall be made by a compensation  deferral  election made in such
form and manner as the  Committee  shall  determine;  provided any such election
shall be made prior to the calendar year such  contributions are to begin, or if
a Participant first becomes eligible to make contributions under this subsection
4.4 after the beginning of any  subsequent  calendar year, not more than 30 days
after so becoming eligible. A Participant's compensation deferral election under
this  subsection 4.4 shall apply to employment  compensation  otherwise  payable
after the later to occur of the date the  Participant  becomes  eligible to make
before-tax  contributions  and the date the election is made. A Participant  may
revoke  or  reinstate  his  deferral  election  under  this  subsection  4.4  in
accordance with the rules on revocation and reinstatement of deferral  elections
found in subsection 4.3.

4.5.  Employer  Matching  Contributions.  A  Participant  who  makes  before-tax
contributions  under  subsection  4.3 shall be  entitled to  "Employer  Matching
Contributions"  under this Plan equal to the  additional  "corporation  matching
contributions"  he would have been entitled to receive under the Investment Plan
if such before-tax  contributions were permitted to be made under the Investment
Plan.  Employer  matching  contributions  will  not be  made  on any  before-tax
contributions  made pursuant to subsection  4.4. For purposes of this Section 4,
"corporation matching  contributions" means all forms of matching  contributions
provided for in Section 4 of the Investment Plan.

4.6. Separate Accounts,  Subaccounts,  Deemed  Investments.  The Committee shall
maintain  a  bookkeeping  account  in the  name of each  Participant  who  makes
before-tax  contributions  under  this  Section 4 and shall  maintain a separate
bookkeeping  account  in his name to  reflect  Employer  Matching  Contributions
attributable  to  such  before-tax  contributions.   In  accordance  with  rules
established by the Committee,  each  Participant's  account shall be adjusted to
reflect the investment  experience of one or more deemed investments selected by
the Participant  from among the investment funds offered in the Investment Plan.
The Committee may maintain such  subaccounts as it deems necessary to effect the
immediately  preceding sentence.  Any reference to a Participant's  "account" or
"accounts"   shall  include  all  subaccounts   established  on  behalf  of  the
Participant  by  the  Committee  in  accordance  with  this   subsection.   Each
Participant's  accounts  and  subaccounts  shall be adjusted at such time and in
such manner as accounts of  participants  in the Investment Plan are adjusted to
reflect the balances  that would have been in such  accounts if they had in fact
been maintained under the Investment Plan as described above. However, as of the
New Effective Date, each Participant's  accounts and subaccounts are not charged
the amounts that they would have been charged to represent  fees and expenses if
they had in fact been maintained under the Investment Plan. The Committee in its
discretion  may elect at some  future  date to charge  all or a portion  of such
amounts to the accounts and  subaccounts of Participants in accordance with such
rules as it may establish.


4.7.  Withdrawals.  No withdrawals may be made under this Plan with respect to a
Participant's accounts prior to the Participant's termination of employment with
the  Company  and  all of  its  subsidiaries  other  than  hardship  withdrawals
described  below.  A  Participant  may  request a hardship  withdrawal  from the
portion of his account that he would be entitled to receive under subsection 4.8
if he terminated employment with the Company and all subsidiaries on the date of
such withdrawal.  A Participant who is receiving  installment  distributions (if
such are permitted under subsection 4.9) also may request a hardship withdrawal.
Any hardship withdrawal shall be made in the same manner and subject to the same
conditions and  limitations as are set forth in the Investment Plan for hardship
withdrawals from participants'  before-tax  accounts.  However, if a Participant
incurs a hardship,  he must request a hardship withdrawal under this Plan to the
extent required to satisfy the immediate and heavy financial need caused by such
hardship before he may request a hardship  withdrawal  under the Investment Plan
or any other USG Defined  Contribution Plan. A withdrawal shall be made from the
Plan as soon as practicable after the request for the withdrawal is received and
approved by the Committee and shall be charged to the appropriate account of the
Participant  as of the date the  withdrawal  is actually  made pursuant to rules
established by the Committee.


4.8.  Vesting of Accounts.  Upon a Participant's  termination of employment with
the Company and all of its subsidiaries, the Participant (or in the event of his
death, his Supplemental Plan Beneficiary, as defined in subsection 5.2) shall be
entitled to the entire balance in the  Participant's  account which reflects his
before-tax  contributions  made under this  Section 4  (subject  to  adjustments
required of such account until complete distribution  thereof).  The Participant
or Supplemental Plan Beneficiary,  as the case may be, shall be entitled to that
portion  of  the  balance  in  the  Participant's  account  which  reflects  the
Participant's  share of  Employer  Matching  Contributions  the  Participant  or
Supplemental  Plan Beneficiary  would have been entitled to under the Investment
Plan if such contributions were "corporation matching  contributions" made under
the  Investment  Plan and such  account had been  maintained  as a  "corporation
account" under that Plan (subject to adjustments  required of such account until
complete distribution of the vested portion thereof).

4.9. Distribution of Accounts. Subject to the provisions of this subsection 4.9,
Part B  Supplemental  Benefits  shall be paid in a lump sum within 30 days after
such benefits become payable or, if the entire amount of such benefits cannot be
determined by the Committee within 30 days, payment shall be made in one or more
installments as determined by the Committee but with the last payment due by the
30th day following the date the  Committee  determines  the total amount of such
benefits.  The Committee in its discretion may from time to time establish rules
incorporating  objective standards that shall govern the form of payment of Part
B  Supplemental  Benefits  that  initially  become  payable  during a subsequent
calendar  year.  The  distribution  options  for  Part B  Supplemental  Benefits
established  by the  Committee  under this  subsection  4.9 may differ  from the
distribution  options  established by the Committee under subsection 3.6 for the
distribution  of Part A Supplemental  Benefits,  but shall be established in the
same manner and subject to the same  conditions and limitations as are set forth
in subsection 3.6, except that subparagraph  3.6(d) shall not apply in the event
of the death of a Participant.



                                    SECTION 5

                         Spouses, Beneficiaries, Funding


5.1.  Eligible  Spouse.  The spouse of a  Participant  will be  considered as an
"Eligible  Spouse" as of any date only if at least six months prior  thereto the
Participant  and his spouse were  lawfully  married  under the laws of the state
where the marriage was contracted and the marriage remains legally effective.


5.2.  Supplemental Plan Beneficiary.  A "Supplemental  Plan Beneficiary" means a
person who has been designated by a Participant as such by writing signed by the
Participant and filed with the Committee prior to the Participant's  death. If a
Participant failed to designate a Supplemental Plan Beneficiary or if the person
he designated predeceases the Participant,  the Participant's  Beneficiary under
the  Retirement  Plan shall be his  Supplemental  Plan  Beneficiary as to Part A
Supplemental  Death Benefits and his Beneficiary under the Investment Plan shall
be his Supplemental Plan Beneficiary as to Part B Supplemental Death Benefits.


5.3.  Funding.  Benefits  payable  under  this  Plan  to a  Participant  or  his
Supplemental Plan Beneficiary shall be paid directly by the Employers from their
general assets in such  proportions as the Company shall determine to the extent
such  benefits  are not paid  from a  Special  Retirement  Account  (established
pursuant to  Supplement A of this Plan) or from a so-called  "rabbi  trust",  an
irrevocable  grantor  trust the  assets of which are  subject  to the  claims of
creditors of the Employers in the event of their insolvency. The Employers shall
not be required to segregate  on their books or otherwise  any amount to be used
for the payment of benefits  under this Plan,  except as to any amounts  paid or
payable to a Special  Retirement Account under Supplement A of this Plan or to a
"rabbi trust".


                                    SECTION 6

                               General Provisions


6.1. Statement of Accounts.  The Committee shall furnish each Participant with a
statement of his Part B  Supplemental  Benefits  accounts  under this Plan as of
each  December 31, and may in its  discretion  furnish such  statements  at more
frequent intervals.


6.2. Employment Rights. Establishment of the Plan shall not be construed to give
any  Participant  the right to be  retained  in the employ of the Company or any
other Employer or to any benefits not specifically provided by this Plan.


6.3.  Interests Not Transferable.  Except as to withholding of any tax under the
laws of the  United  States  or any  state or  municipality,  the  interests  of
Participants and their  Supplemental Plan  Beneficiaries  under the Plan are not
subject  to the  claims  of  their  creditors  and  may  not be  voluntarily  or
involuntarily transferred, assigned, alienated or encumbered.

6.4.  Controlling  Law. The laws of Illinois shall be controlling in all matters
relating to the Plan.


6.5. Gender and Number.  Where the context admits, words in the masculine gender
shall  include the feminine  and neuter  genders,  the plural shall  include the
singular and the singular shall include the plural.


6.6.  Action by the Company.  Any action required of or permitted by the Company
under the Plan shall be by  resolution  of its Board of  Directors  or by a duly
authorized  committee  of its  Board of  Directors,  or by a person  or  persons
authorized by resolution of its Board of Directors or such committee.


6.7. Successor to the Company or Any Other Employer.  The term "Company" as used
in the Plan shall  include  any  successor  to the  Company by reason of merger,
consolidation,  the  purchase  or transfer  of all or  substantially  all of the
Company's  assets,  or otherwise.  The term  "Employer" as used in the Plan with
respect to the Company or any  subsidiary  shall  include any  successor to that
corporation by reason of merger, consolidation,  the purchase or transfer of all
or substantially all of the assets of that corporation, or otherwise.


6.8.  Facility of Payment.  Any amounts payable  hereunder to any person under a
legal disability or who, in the judgment of the Committee, is unable to properly
manage his affairs may be paid to the legal representative of such person or may
be applied for the benefit of such person in any manner which the  Committee may
select. Any payment made in accordance with the next preceding sentence shall be
a full and complete discharge of any liability for such payment under the Plan.



                                    SECTION 7

                            Amendment and Termination


While the Employers  expect to continue the Plan,  the Company must  necessarily
reserve  and  reserves  the  right to amend  the  Plan  from  time to time or to
terminate  the  Plan at any  time.  However,  no  amendment  of the Plan nor the
termination  of the Plan may cause the  reduction  or  cessation of any benefits
that,  but for such  amendment or  termination,  are payable  under this Plan or
would become  payable  under this Plan after the date such  amendment is made or
the  termination  of the Plan occurs with respect to benefits  accrued under the
Retirement  Plan and all other USG Defined Benefit Plans prior to such date, and
with  respect to  Participants'  before-tax  contributions  made under this Plan
prior to such date and  Employer  Matching  Contributions  attributable  to such
before-tax contributions.



                                  SUPPLEMENT A
                                       TO
                  USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN


A-1. Purpose, Special Retirement Account. The purpose of this Supplement A is to
provide for  installment  payments of part or all of the accrued  benefits under
Part A of the Plan of each Eligible  Participant  to an individual  account (the
"Special  Retirement  Account") the  Participant  established in his name with a
bank or trust company designated by the Company pursuant to an agreement between
the Participant and the Company (the "Special Retirement Agreement").


A-2.  Eligible  Participant.  The term  "Eligible  Participant"  as used in this
Supplement A means a  Participant  in Part A of the Plan who had  established  a
Special  Retirement  Account on or before May 1, 1993. No  Participant  has been
eligible to establish a Special Retirement Account after May 1, 1993.


A-3.  Accrued  Benefit and Death Benefit Values,  After-Tax  Accrued Benefit and
Death Benefit  Values.  The following terms used in this Supplement A shall have
the following meanings:

     (a) "Accrued  Benefit  Value" as of any date means the present  value of an
Eligible  Participant's  Part A Supplemental  Benefits under the Plan as of that
date, as determined by the Committee  (calculated  on the bases of the actuarial
factors,  assumptions  and  tables  then  applied  for that  purpose  under  the
Retirement  Plan and benefit  limitations  imposed by the Internal  Revenue Code
then in effect,  and  assuming  that no payments  have been made to the Eligible
Participant's  Special Retirement Account pursuant to Paragraph A-5 and that the
Eligible  Participant  will  not  have  any  additional  service  or  employment
compensation).

     (b)  "After-Tax  Accrued  Benefit  Value" as of any date means an  Eligible
Participant's  Accrued  Benefit  Value as of that  date less  Applicable  Income
Taxes.

     (c)  "Accrued  Death  Benefit  Value"  means,  in the  case of an  Eligible
Participant  whose  death  occurs  prior  to  receipt  of  any  portion  of  the
Participant's Part A Supplemental  Benefits, the present value as of the date of
the Eligible Participant's death, as determined by the Committee,  of the Part A
Supplemental  Death  Benefits,  if any,  payable to the  Eligible  Participant's
Eligible  Spouse  as of that  date  (calculated  on the  basis of the  actuarial
factors,  assumptions  and tables  then  applied  under the  Retirement  Plan in
determining the present value of accrued death benefits and benefit  limitations
imposed by the  Internal  Revenue  Code then in  effect,  and  assuming  that no
payments  have  been  made  to the  Eligible  Participant's  Special  Retirement
Account).

     (d)  "After-Tax  Accrued  Death  Benefit  Value"  means,  in the case of an
Eligible Participant described in the next preceding sentence, the Accrued Death
Benefit Value as of the date of the Eligible Participant's death less Applicable
Income Taxes.


A-4.  Applicable Income Taxes.  "Applicable Income Taxes" means, with respect to
any amount, federal, state and local income taxes on such amount (using for this
purpose,  and subject to such rules as the Committee may establish,  the highest
published applicable  individual income tax rate in effect for the calendar year
as to which  such  taxes are being  determined),  provided  that state and local
income taxes shall be considered net of federal income tax benefits.


A-5. Payments to the Special  Retirement  Account.  Subject to the provisions of
Paragraph  A-6, the following  payments  will be made to the Special  Retirement
Account of each  Eligible  Participant.  As of the  beginning  of each  calendar
quarter,  the Committee shall determine the Employee's After-Tax Accrued Benefit
Value as well as the amount, if any, by which such value exceeds the fair market
value of all  assets  of the  Special  Retirement  Account  as of the end of the
preceding  calendar  quarter.  If  Employee's  After-Tax  Accrued  Benefit Value
exceeds the fair market value of such assets by $100,000 or more, a payment will
be made to the Special  Retirement  Account equal to the difference between such
values.  Payments  required to be made to the Special  Retirement  Account under
this Paragraph A-5 shall be made directly by the Company or from USG Corporation
Deferred Benefit Trust, or from both sources,  as soon as practicable  after the
amounts of the payments have been  determined by the Committee.  Pursuant to the
terms of the Special Retirement Agreement,  the Company will gross-up the amount
of a payment made to the Special  Retirement Account under this Paragraph A-5 so
as to provide  funds for the  Applicable  Income  Taxes  payable by the Eligible
Participant  on such payment and will make  payments to (or with respect to) the
Eligible  Participant in order to provide funds for the Applicable  Income Taxes
payable on investment income earned by the Special Retirement Account.


A-6.  Adjustment of Part A Supplemental  Benefits and Part A Supplemental  Death
Benefits Upon Retirement or Death.  For the purpose of determining the amount of
payments  to be made to an Eligible  Participant's  Special  Retirement  Account
pursuant  to  Paragraph  A-5,  it is  assumed  that  no  portion  of the  Part A
Supplemental Benefits he has accrued has been paid under the Plan. However, each
payment  made to an Eligible  Participant's  Special  Retirement  Account  shall
reduce the  obligation of the Plan to provide Part A  Supplemental  Benefits and
Part  A  Supplemental  Death  Benefits  to or  with  respect  to  that  Eligible
Participant and thus benefits  otherwise payable under the Plan shall be reduced
to reflect such  payments.  Upon an Eligible  Participant's  retirement or death
before retirement, the following shall apply:

     (a) No  further  payments  need  be made  under  the  Plan to the  Eligible
Participant's Special Retirement Account.

     (b) The  Committee  shall  determine  the  amount  of  Part A  Supplemental
Benefits or Part A  Supplemental  Death Benefits that would be payable under the
Plan as a result of such retirement or death if no payments had been made to the
Eligible  Participant's  Special Retirement Account and also shall determine the
After-Tax Accrued Benefit Value or After-Tax Accrued Death Benefit Value, as the
case may be, of those benefits.

     (c) The  benefits  determined  under  subparagraph  (b) next above shall be
reduced so that their  After- Tax Accrued  Benefit  Value or  After-Tax  Accrued
Death  Benefit Value equals the amount by which the  After-Tax  Accrued  Benefit
Value or After-Tax  Accrued Death Benefit Value,  determined in accordance  with
subparagraph (b) next above,  exceeds the fair market value of all assets of the
Eligible  Participant's  Special  Retirement  Account  as of  the  date  of  his
retirement or death,  disregarding  assets of the Special Retirement Account, if
any, that are required to be paid to the Company.  Subject to the  provisions of
subparagraph (d) next below,  the resulting  benefits shall be the actual Part A
Supplemental  Benefits or Part A  Supplemental  Death Benefits that will be paid
under the Plan to, or with respect to, the Eligible Participant.

     (d)  Subparagraph  3.7(b) of the Plan  provides  for the  payment of Part A
Supplemental  Death Benefits to the Eligible  Spouse of an Eligible  Participant
who dies after  retirement  but before  payment of any  portion of the  Eligible
Participant's Part A Supplemental Benefits had been made or commenced.  However,
if an Eligible  Participant  retires but dies before all assets in the  Eligible
Participant's   Special  Retirement  Account  not  in  excess  of  the  Eligible
Participant's  After-Tax Accrued Benefit Value have been distributed to him, the
Special  Retirement  Agreement  requires that the undistributed  portion of such
assets be distributed as soon as  practicable  after the Eligible  Participant's
death to the Eligible  Participant's  Beneficiary  under the Special  Retirement
Agreement.  In this case,  Part A  Supplemental  Death Benefits shall be payable
under  subparagraph  3.7(b) of the Plan to the  Eligible  Spouse of the Eligible
Participant  only to the extent,  if any,  the fair  market  value of the assets
distributed  from the Special  Retirement  Account to the  Eligible  Participant
after his  retirement and the assets  distributed or to be distributed  from the
Special  Retirement  Account  to such  Beneficiary  is less than the  After- Tax
Accrued Death Benefit Value of the Part A Supplemental  Death Benefits otherwise
payable to the Eligible Spouse under Part A of the Plan.

     (e) The actual Part A Supplemental  Benefits or Part A  Supplemental  Death
Benefits  determined under subparagraphs (c) and (d) next above shall be paid as
provided in subsection 3.6 or 3.7 of the Plan, whichever applies.

     (f) If the fair market  value of all assets in the  Eligible  Participant's
Special Retirement Account as of the date of his retirement or death exceeds the
After-Tax  Accrued  Benefit Value or the AfterTax  Accrued Death Benefit  Value,
whichever applies,  the Special  Retirement  Agreement provides that such excess
assets shall be returned to the Company.


A-7.  Terms and Provisions of the Plan. All the terms and provisions of the Plan
shall apply to this  Supplement  A and vice versa,  except that where and to the
extent the terms and provisions of the Plan and this Supplement A conflict,  the
terms and provisions of this Supplement A shall govern.
</TEXT> </DOCUMENT>
<DOCUMENT>
<TYPE>EX-10
<SEQUENCE>3
<DESCRIPTION>MATERIAL CONTRACTS
<TEXT>



                                  EXHIBIT 10(l)

                                 Execution Copy


AMENDMENT  NO.  2  dated  as of May  14,  1997  (this  "Amendment"),  among  USG
Corporation, a Delaware corporation (the "Borrower"), the financial institutions
parties hereto (the  "Lenders") and The Chase Manhattan Bank, a New York banking
corporation,  formerly known as Chemical Bank, in its separate capacity as agent
for the Lenders (the "Agent").

PRELIMINARY STATEMENTS. (1) The Borrower, the Lenders, the Issuing Banks and the
Agent have  entered  into the Credit  Agreement  dated as of July 27,  1995,  as
amended by  Amendment  No. 1 thereto  dated as of February 1, 1996 (the  "Credit
Agreement")  and have agreed to amend the Credit  Agreement as  hereinafter  set
forth.

(2)  Capitalized  terms used herein and not otherwise  defined herein shall have
the meanings ascribed to such terms in the Credit Agreement.

In  consideration  of the premises and the agreements,  provisions and covenants
herein  contained,  the parties hereto hereby agree, on the terms and subject to
the conditions set forth herein, as follows:

SECTION 1.  Amendment of the Credit  Agreement.  The Credit  Agreement is hereby
amended as follows:

1.  Section  1.01 of the  Credit  Agreement  is hereby  amended  to  delete  the
definition of "Applicable  Commitment  Fee" contained  therein and to substitute
the following therefor:

"Applicable  Commitment Fee" shall mean, for any date, the applicable  number of
basis  points  (expressed  as  a  percentage)  set  forth  below  based  on  the
Debt/EBITDA  Ratio as of the  last day of the  Borrower's  most  recently  ended
period of four consecutive fiscal quarters:

         Debt/EBITDA Ratio                                                        Applicable Commitment Fee
         -----------------                                                        -------------------------
                                                                                     (in basis points)

                                                                                         
         greater than 3.00 to 1.0                                                           31.25

         greater than 2.50 to 1.0 but less
           than or equal to 3.00 to 1.0                                                     25.00

         greater than 2.00 to 1.0 but less
           than or equal to 2.50 to 1.0                                                     22.50

         greater than 1.50 to 1.0 but less
           than or equal to 2.00 to 1.0                                                     20.00

         greater than 1.25 to 1.0 but less
           than or equal to 1.50 to 1.0                                                     18.75

         greater than 1.00 to 1.0 but less
           than or equal to 1.25 to 1.0                                                     15.00

         less than or equal to 1.0 to 1.0                                                   12.50

For purposes of the foregoing,  the Applicable  Commitment Fee at any time shall
be  determined by reference to the  Debt/EBITDA  Ratio as of the last day of the
Borrower's  most recently ended fiscal quarter,  provided,  that, in calculating
the Debt/EBITDA  Ratio for purposes of this  definition,  Debt shall not include
obligations  with  respect  to letters  of credit  (including  Letters of Credit
issued hereunder)  entered into in the ordinary course of business and having an
aggregate  outstanding  face  amount of up to  $50,000,000  to the  extent  such
letters  of  credit  are not drawn on or, if and to the  extent  drawn on,  such
drawing is promptly reimbursed following receipt by the applicable account party
of a demand  for  reimbursement  following  payment  on the  letter  of  credit.
Following  the end of any such  fiscal  quarter,  any  change in the  Applicable
Commitment Fee shall become  effective for all purposes on and after the earlier
of (i) the date of delivery to the Agent of the  Debt/EBITDA  Ratio  Certificate
for such  fiscal  quarter  and (ii) the  date of  delivery  to the  Agent of the
Financial Officer's certificate and applicable financial statements described in
Sections 5.07(a),  (b) and (c) relating to such fiscal quarter.  Notwithstanding
the  foregoing,  at any time during which the Borrower has failed to deliver the
Financial Officer's certificate and applicable financial statements described in
Sections  5.07(a),  (b) and (c) with respect to a fiscal  quarter in  accordance
with the provisions  thereof for more than five days after such  certificate and
the  applicable  financial  statements  are due,  and  until  such  time as such
financial  statements are so delivered,  the Applicable  Commitment Fee shall be
31.25 basis points.

2.  Section  1.01 of the  Credit  Agreement  is hereby  amended  to  delete  the
definition of "Applicable Eurodollar Margin" contained therein and to substitute
the following therefore:

"Applicable  Eurodollar  Margin" shall mean,  for any date,  with respect to the
Revolving Loans comprising any Eurodollar  Borrowing,  the applicable margin set
forth below based on the Debt/EBITDA  Ratio as of the last day of the Borrower's
most recently ended period of four consecutive fiscal quarters:



         Debt/EBITDA Ratio                                                        Applicable Commitment Fee
         -----------------                                                        -------------------------
                                                                                     (in basis points)

                                                                                         
         greater than 3.00 to 1.0                                                           112.5

         greater than 2.50 to 1.0 but less
           than or equal to 3.00 to 1.0                                                     75.00

         greater than 2.00 to 1.0 but less
           than or equal to 2.50 to 1.0                                                     62.50

         greater than 1.50 to 1.0 but less
           than or equal to 2.00 to 1.0                                                     55.00

         greater than 1.25 to 1.0 but less
           than or equal to 1.50 to 1.0                                                     45.00

         greater than 1.00 to 1.0 but less
           than or equal to 1.25 to 1.0                                                     40.00

         less than or equal to 1.0 to 1.0                                                   37.50


For purposes of the  foregoing,  the  Applicable  Eurodollar  Margin at any time
shall be determined by reference to the Debt/EBITDA  Ratio as of the last day of
the  Borrower's  most  recently  ended  fiscal  quarter,   provided,   that,  in
calculating the Debt/EBITDA  Ratio for purposes of this  definition,  Debt shall
not include  obligations with respect to letters of credit (including Letters of
Credit  issued  hereunder)  entered into in the ordinary  course of business and
having an aggregate  outstanding  face amount of up to $50,000,000 to the extent
such  letters of credit are not drawn on or, if and to the extent drawn on, such
drawing is promptly reimbursed following receipt by the applicable account party
of a demand  for  reimbursement  following  payment  on the  letter  of  credit.
Following  the end of any such  fiscal  quarter,  any  change in the  Applicable
Eurodollar  Margin  shall  become  effective  for all  purposes on and after the
earlier  of (i) the  date of  delivery  to the  Agent of the  Debt/EBITDA  Ratio
Certificate  and  (ii)  the  date of  delivery  to the  Agent  of the  Financial
Officer's  certificate and applicable financial statements described in Sections
5.07(a),  (b) and (c)  relating  to such  fiscal  quarter.  Notwithstanding  the
foregoing,  at any time  during  which the  Borrower  has failed to deliver  the
Financial Officer's certificate and applicable financial statements described in
Sections  5.07(a),  (b) and (c) with respect to a fiscal  quarter in  accordance
with the provisions  thereof for more than five days after such  certificate and
the  applicable  financial  statements  are due,  and  until  such  time as such
financial statements are so delivered, the Applicable Eurodollar Margin shall be
112.50 basis points.

1.3  Section  5.09 of the Credit  Agreement  (which  requires  the pledge to the
Collateral Trustee of newly created or acquired domestic Material  Subsidiaries)
is hereby deleted in its entirety.

1.4 Section 6.09 of the Credit Agreement is hereby amended to delete the maximum
Debt/EBITDA  Ratio of 4.50 to 1.00 set forth in  subsection  (a)  thereof and to
substitute a maximum Debt/EBITDA Ratio of 4.00 to 1.00 therefor.

SECTION 2. Release of Collateral.  Pursuant to Section 9.07(c)(ii) of the Credit
Agreement, all of the Lenders hereby direct the Collateral Trustee, and instruct
the Borrower to direct the Collateral Trustee, to release its Lien on all of the
"Collateral"  (as defined in the Collateral  Trust Agreement) in accordance with
the procedures described in Section 7 of the Collateral Trust Agreement.

SECTION 3. Representations and Warranties.  The Borrower represents and warrants
to each of the Lenders and the Agent that:

         (a) This Amendment has been duly authorized,  executed and delivered by
it and  constitutes  its legal,  valid and binding  obligation,  enforceable  in
accordance  with its  terms  except as such  enforceability  may be  limited  by
bankruptcy, insolvency, reorganization, fraudulent transfer, moratorium or other
similar laws affecting  creditors' rights generally and by general principles of
equity (regardless of whether such  enforceability is considered in a proceeding
at law or in equity).

         (b)  Before   and  after   giving   effect   to  this   Amendment,  the
representations  and warranties  set forth in Article V of the Credit  Agreement
are true and correct in all material respects with the same effect as if made on
the date  hereof,  except to the  extent  such  representations  and  warranties
expressly relate to an earlier date.

         (c) Before or after giving effect to this Amendment, no Event of
 Default or Potential Event of Default has occurred and is continuing.

SECTION 4. Condition to  Effectiveness.  The amendments to the Credit  Agreement
set forth in this  Amendment  shall become  effective as of the date first above
written when the Agent shall have received  counterparts of this Amendment that,
when taken  together,  bear the  signatures of the Borrower,  the Agent and each
Lender.

SECTION 5. Credit Agreement.  Except as specifically  amended hereby, the Credit
Agreement  and each Loan  Document  shall  continue  in full force and effect in
accordance  with the respective  provisions  thereof as in existence on the date
hereof.  After the date hereof, any reference to the Credit Agreement shall mean
the Credit Agreement as amended hereby.


SECTION 6. Applicable Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

SECTION  7.  Counterparts.  This  Amendment  may be  executed  in  two  or  more
counterparts,  each of which shall  constitute an original but all of which when
taken together shall constitute but one contract.

SECTION  8.  Expenses.  The  Borrower  agrees  to  reimburse  the  Agent for its
out-of-pocket  expenses  in  connection  with  this  Amendment,   including  the
reasonable fees,  charges and disbursements of Sidley & Austin,  counsel for the
Agent.


IN WITNESS  WHEREOF,  the parties  hereto have caused this  Amendment to be duly
executed by their  respective  authorized  officers as of the day and year first
written above.

                         USG CORPORATION


                         By_____________________________
                         Name:__________________________
                         Title:_________________________



                         THE CHASE MANHATTAN BANK,
                         individually and as Agent

                         By______________________________
                         Name:___________________________
                         Title:__________________________



                          BANKERS TRUST COMPANY


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          CITIBANK, N.A.


                          By______________________________
                          Name:___________________________
                          Title:__________________________




                          THE BANK OF TOKYO-MITSUBISHI, LTD.,
                          CHICAGO BRANCH


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          BANK OF MONTREAL
  

                          By______________________________
                          Name:___________________________
                          Title:__________________________




                          BANQUE PARIBAS, CHICAGO BRANCH

                          By______________________________
                          Name:___________________________
                          Title:__________________________


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          THE FIRST NATIONAL BANK OF CHICAGO


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          THE FUJI BANK, LIMITED


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          THE INDUSTRIAL BANK OF JAPAN,
                          LIMITED, CHICAGO BRANCH


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          LASALLE NATIONAL BANK


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          MORGAN GUARANTY TRUST COMPANY OF NEW
                          YORK


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          THE NORTHERN TRUST COMPANY


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          THE SANWA BANK, LIMITED, CHICAGO BRANCH


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          TORONTO DOMINION (TEXAS), INC.
 

                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          ARAB BANKING CORPORATION


                          By_____________________________
                          Name:__________________________
                          Title:_________________________




                          MITSUBISHI TRUST & BANKING CORPORATION,
                          CHICAGO BRANCH


                          By______________________________
                          Name:___________________________
                          Title:__________________________




                          WACHOVIA BANK OF GEORGIA, N.A.


                          By______________________________
                          Name:___________________________
                          Title:__________________________




                          TRUST COMPANY BANK


                          By______________________________
                          Name:___________________________
                          Title:__________________________




                          CAISSE NATIONALE DE CREDIT AGRICOLE


                          By______________________________
                          Name:___________________________
                          Title:__________________________



                          THE MITSUI TRUST & BANKING CO. LTD.,
                          NEW YORK BRANCH


                          By______________________________
                          Name:___________________________
                          Title:__________________________




                          THE SUMITOMO BANK, LTD., CHICAGO BRANCH


                          By______________________________
                          Name:___________________________
                          Title:__________________________