<PAGE>
 
                                                                         10.4(b)

                           INDEMNIFICATION AGREEMENT


     THIS AGREEMENT, made and entered into this 20th day of June, 1990
("Agreement"), by and between UNR INDUSTRIES, INC., a Delaware corporation
("Corporation", which term shall include any one or more of its subsidiaries
where appropriate), and DARIUS W. GASKINS, JR. ("Indemnitees"):

     WHEREAS, highly competent persons are becoming more reluctant to serve
corporations as directors or officers or in other capacities unless they are
provided with adequate protection through insurance or adequate indemnification
against inordinate risks of claims and actions against them arising out of their
service to, and activities on behalf of, such corporations; and

     WHEREAS, the current impracticability of obtaining adequate insurance and
the uncertainties relating to indemnification have increased the difficulty of
attracting and retaining such persons;

     WHEREAS, the Board of Directors of the Corporation (the "Board") has
determined that the difficulty in attracting and retaining such persons is
detrimental to the best interests of the Corporation's stockholders and that the
Corporation should act to assure such persons that there will be increased
certainty of such protection in the future;

     WHEREAS, it is reasonable, prudent and necessary for the Corporation
contractually to obligate itself to indemnify such persons to the fullest extent
permitted by applicable law so that they will serve or continue to serve the
Corporation free from undue concern that they will not be so indemnified; and

     WHEREAS, Indemnitee is willing to serve, continue to serve and/or to
undertake additional service for or on behalf of the Corporation on the
condition that he be so indemnified;

     NOW, THEREFORE, in consideration of the premises and the covenants
contained herein, the Corporation and Indemnitee do hereby covenant and agree as
follows:

     1.  Services by Indemnitee.  Indemnitee agrees to serve or continue to
serve as a director and/or officer of the Corporation.  This Agreement shall not
impose any obligation on the Indemnitee or the Corporation to continue the
Indemnitee's position with the Corporation beyond any period otherwise
applicable.

     2.  General.  The Corporation shall indemnify, and shall advance Expenses
(as hereinafter defined) to, Indemnitee as provided in this Agreement and to the
fullest extent permitted by law.

     3.  Proceedings other Than Proceedings by or in the Right of the
Corporation.  Indemnitee shall be entitled to the rights of indemnification
provided in this Section 3 if, by 
<PAGE>
 
reason of his Corporate Status (as hereinafter
defined), he is, or is threatened to be made, a party to any threatened, pending
or completed Proceeding (as hereinafter defined), other than a Proceeding by or
in the right of the Corporation.  Pursuant to this Section 3, Indemnitee shall
be indemnified against Expenses, judgements, fines and amounts paid in
settlement actually and reasonably incurred by him or on his behalf in
connection with such Proceeding or any claim, issue or matter therein, if he
acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of the Corporation, and, with respect to any
criminal Proceeding, had no reasonable cause to believe his conduct was
unlawful.

     4.  Proceedings by or in the Right of the Corporation.  Indemnitee shall be
entitled to the rights of indemnification provided in this Section 4 if, by
reason of his Corporate Status, he is, or is threatened to be made, a party to
any threatened, pending or completed Proceeding brought by or in the right of
the Corporation to procure a judgment in its favor.  Pursuant to this Section 4,
Indemnitee shall be indemnified against Expenses actually and reasonably
incurred by him or on his behalf in connection with such Proceeding if he acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the Corporation.  Notwithstanding the foregoing, no
indemnification against such Expenses shall be made in respect of any claim,
issue or matter as to which Indemnitee shall have been adjudged to be liable to
the Corporation if such indemnification is not permitted by Delaware or other
applicable law; provided, however, that indemnification against Expenses shall
nevertheless be made by the Corporation in such event to the extent that the
Court of Chancery of the State of Delaware, or the court in which such
proceeding shall have been brought or is pending, shall determine.

     5.  Indemnification for Expenses of a Party who is Wholly or Partly
Successful.  Notwithstanding any other provision of this Agreement, to the
extent that Indemnitee is, by reason of his Corporate Status, a party to and is
successful, on the merits or otherwise, in any Proceeding, he shall be
indemnified against all Expenses actually and reasonably incurred by him or on
his behalf in connection therewith.  If Indemnitee is not wholly successful in
such Proceeding but is successful, on the merits or otherwise, as to one or more
but less than all claims, issues or matters in such Proceeding, the Corporation
shall indemnify Indemnitee against all Expenses actually and reasonably incurred
by him or on his behalf in connection with each successfully resolved claim,
issue or matter.  For purposes of this Section 5 and without limitation, the
termination of any claim, issue or matter in such a Proceeding by dismissal or
withdrawal with or without prejudice, shall be deemed to be a successful result
as to such claim, issue or matter.

     6.  Advance of Expenses.  The Corporation shall advance all reasonable
Expenses incurred by or on behalf of Indemnitee in connection with any
Proceeding within twenty (20) days after the receipt by the Corporation of a
statement or statements from Indemnitee requesting such advance or advances from
time to time, whether prior to or after final disposition of such Proceeding.
Such statement or statements shall reasonably evidence the Expenses incurred by
Indemnitee and shall include or be preceded or accompanied by an undertaking by
or on behalf of Indemnitee to repay any Expenses advanced if it shall ultimately
be determined that Indemnitee is not entitled to be indemnified against such
Expenses.  Unpaid expenses shall bear
<PAGE>
 
interest accruing at the prime rate of
interest from the twenty-first (21) day after receipt by the Corporation of such
statement until said expenses are paid.

     7.                     Procedure for Determination of Entitlement to
Indemnification.

          (a) To obtain indemnification under this Agreement, Indemnitee shall
submit to the Corporation a written request, including therein or therewith such
documentation and information as is reasonably available to Indemnitee and is
reasonably necessary to determine whether and to what extent Indemnitee is
entitled to indemnification.  The Secretary of the Corporation shall, promptly
upon receipt of such a request for indemnification, advise the Board and counsel
for the Corporation in writing that Indemnitee has requested indemnification.

          (b) Upon written request by Indemnitee for indemnification pursuant to
Section 7(a) hereof, a determination, if required by applicable law, with
respect to Indemnitee's entitlement thereto shall be made in the specific case:
(i) if a Change in Control (as hereinafter defined) shall have occurred, by
Independent Counsel (as hereinafter defined) in a written opinion to the Board,
a copy of which shall be delivered to Indemnitee (unless Indemnitee shall
request that such determination be made by the Board or the stockholders, in
which case the determination shall be made in the manner provided below in
clause (ii) or (iii); (ii) if a Change of Control shall not have occurred, (A)
by the Board by a majority vote of a quorum consisting of Disinterested
Directors (as hereinafter defined), (B) if a quorum of the Board consisting of
Disinterested Directors is not obtainable or, even if obtainable, such quorum of
Disinterested Directors so directs, by Independent Counsel in a written opinion
to the Board, a copy of which shall be delivered to Indemnitee, or (C) by the
stockholders of the Corporation; or (iii) as provided in Section 8(b) of this
Agreement; and, if it is so determined that Indemnitee is entitled to the
indemnification, payment to Indemnitee shall be made within ten (10) days after
such determination.  Indemnitee shall cooperate with the person, persons or
entity making such determination with respect to Indemnitee's entitlement to
indemnification, including providing to such person, persons or entity upon
reasonable advance request any documentation or information that is not
privileged or otherwise protected from disclosure and which is reasonably
available to Indemnitee and reasonably necessary to such determination.  Any
costs or expenses (including attorneys' fees and disbursements) incurred by
Indemnitee in so cooperating shall be borne by the Corporation "irrespective of
the determination as to Indemnitee's entitlement to indemnification) and the
Corporation hereby indemnifies and agrees to hold Indemnitee harmless therefrom.

          (c) If the determination of entitlement to indemnification is to be
made by Independent Counsel pursuant to Section 7(b) of this Agreement, the
Independent Counsel shall be selected as provided in this Section 7(c).  If a
Change of Control shall not have occurred, the Independent Counsel shall be
selected by the Board, and the Corporation shall give written notice to
Indemnitee advising him of the identity of the Independent Counsel so selected.
If a Change of Control shall have occurred, the Independent Counsel shall be
selected by Indemnitee (unless Indemnitee shall request that such selection be
made by the Board, in which event the preceding sentence shall apply), and
Indemnitee shall give written notice to the Corporation advising it of the
identity of the Independent Counsel so selected.  In either event, Indemnitee or
<PAGE>
 
the Corporation, as the case may be, may, within seven (7) days after such
written notice of selection shall have been given, deliver to the Corporation or
to Indemnitee, as the case may be, a written objection to such selection.  Such
objection may be asserted only on the ground that the Independent Counsel so
selected does not meet the requirement of "Independent Counsel" as defined in
Section 14 of this Agreement, and the objection shall set forth with
particularity the factual basis of such assertion.  If such written objection is
made, the Independent Counsel so selected may not serve as Independent Counsel
unless and until a court has determined that such objection is without merit.
If, within twenty (20) days after submission by Indemnitee of a written request
for indemnification pursuant to Section 7(a) of this Agreement, no Independent
Counsel shall have been selected or, if selected, shall have been objected to,
in accordance with this Section 7(c), either the Corporation or Indemnitee may
petition the Court of Chancery of the State of Delaware or other court of
competent jurisdiction for resolution of any objection that shall have been made
by the Corporation or Indemnitee to the other's selection of Independent Counsel
and/or for the appointment as Independent Counsel of-a person selected by the
Court or by such other person as the Court shall designate, and the person with
respect to whom an objection is favorably resolved or the person as so appointed
shall act as Independent Counsel under Section 7(b) of this Agreement.  The
Corporation shall pay any and all reasonable fees and expenses of Independent
Counsel incurred by such Independent Counsel in connection with acting pursuant
to Section 7(b) of this Agreement, and the Corporation shall pay all reasonable
fees and expenses incident to the procedures of this Section 7(c), regardless of
the manner in which such Independent Counsel was selected or appointed.  Upon
the due commencement of any judicial proceeding or arbitration pursuant to
Section 9(a)(iii) of this Agreement, Independent Counsel shall be discharged and
relieved of any further responsibility in such capacity (subject to the
applicable standards of professional conduct then prevailing).

     8.  Presumptions and Effect of Certain Proceedings.

          (a) If a Change of Control shall have occurred, in making a
determination with respect to entitlement to indemnification hereunder, the
person, persons or entity making such determination shall presume that
Indemnitee is entitled to indemnification under this Agreement if Indemnitee has
submitted a request for indemnification in accordance with Section 7(a) of this
Agreement, and the Corporation shall have the burden of proof to overcome that
presumption in connection with the making by any person, persons or entity of
any determination contrary to that presumption.

          (b) If the person, persons or entity empowered or selected under
Section 7 of this Agreement to determine whether Indemnitee is entitled to
indemnification shall not have made such determination within sixty (60) days
after receipt by the Corporation of the request therefor, the requisite
determination of entitlement to indemnification shall be deemed to have been
made and Indemnitee shall be entitled to such indemnification, absent (i) a
misstatement by Indemnitee of a material fact, or an omission of a material fact
necessary to make Indemnitee's statement not materially misleading, in
connection with the request for indemnification, or (ii) a prohibition of such
indemnification under applicable law; provided, however, that such sixty-day
period may be extended for a reasonable time, not to exceed an additional thirty
(30) days, if the person, persons or entity making the determination with
respect to entitlement to indemnification 
<PAGE>
 
in good faith requires such additional time for the obtaining or evaluating of
documentation and/or information relating thereto; and provided, further, that
the foregoing provisions of this Section 8(b) shall not apply (i) if the
determination of entitlement to indemnification is to be made by the
stockholders pursuant to Section 7(b) of this Agreement and if (A) within
fifteen (15) days after receipt by the Corporation of the request such
determination the Board has resolved to submit such determination to the
stockholders for their consideration at an annual meeting thereof to be held
within seventy-five (75) days after such receipt and such determination is made
threat, or (B) a special meeting of stockholders is called within fifteen (15)
days after such receipt for the purpose of making such determination, such
meeting is held for such purpose within sixty (60) days after having been so
called and such determination of entitlement is made thereat, or (ii) if the
determination of entitlement to indemnification is to be made by Independent
Counsel pursuant to Section 7(b) of this Agreement.

          (c) The termination of any Proceeding or of any claim, issue or matter
therein by judgment, order, settlement or conviction, or upon a plea of nolo
contendere or its equivalent, shall not (except as otherwise expressly provided
in this Agreement) of itself adversely affect the right of Indemnitee to
indemnification or create a presumption that Indemnitee did not act in good
faith and in a manner that he reasonably believed to be in or not opposed to the
best interests of the Corporation or, with respect to any criminal Proceeding,
that Indemnitee had reasonable cause to believe that his conduct was unlawful.

     9.                                  Remedies and Indemnitee.

          (a) If (i) a determination is made pursuant to Section 7 of this
Agreement that Indemnitee is not entitled to indemnification under this
Agreement, (ii) advancement of Expenses is not timely made pursuant to Section 6
of this Agreement, (iii) the determination of entitlement to indemnification is
to be made by Independent Counsel pursuant to Section 7(b) of this Agreement and
such determination shall not have been made and delivered in a written opinion
within ninety (90) days after receipt by the Corporation of the request for
indemnification, (iv) payment of indemnification is not made pursuant to Section
5 of this Agreement within ten (10) days after receipt by the Corporation of a
written request therefor or (v) payment of indemnification or such determination
is deemed to have been made pursuant to Section 8 of this Agreement, Indemnitee
shall be entitled to an adjudication in an appropriate court of the State of
Delaware, or in any other court of competent jurisdiction, of his entitlement to
such indemnification or advancement of Expenses.  Alternatively, Indemnitee, at
his option, may seek an award in arbitration to be conducted by a single
arbitrator, which arbitrator shall be a member of the bar in the State of
Illinois, pursuant to the rules of the American Arbitration Association.
Indemnitee shall commence such proceeding seeking an adjudication or an award in
arbitration within 180 days following the date on which Indemnitee first has the
right to commence such proceeding pursuant to this Section 9(a).  The
Corporation shall not oppose Indemnitee's right to any such adjudication or
award in arbitration.

          (b) In the event that a determination shall have been made pursuant to
Section 7 of this Agreement that Indemnitee is not entitled to indemnification,
any judicial proceeding or arbitration commenced pursuant to this Section 9
shall be conducted in all respects as a de novo 
<PAGE>
 
trial, or arbitration, on the
merits and Indemnitee shall not be prejudiced by reason of that adverse
determination.  If a Change of Control shall have occurred, in any judicial
proceeding or arbitration commenced pursuant to this Section 9 the Corporation
shall have the burden of proving that Indemnitee is not entitled to
indemnification or advancement of Expenses, as the case may be.

          (c) If a determination shall have been made or deemed to have been
made pursuant to Section 7 or 8 of this Agreement that Indemnitee is entitled to
indemnification, the Corporation shall be bound by such determination in any
judicial proceeding or arbitration commenced pursuant to this Section 9, absent
(i) a misstatement by Indemnitee of a material fact, or an omission of a
material fact necessary to make Indemnitee's statement not materially
misleading, in connection with the request for indemnification or (ii) a
prohibition of such indemnification under applicable law.

          (d) The Corporation shall be precluded from asserting in any judicial
proceeding or arbitration commenced pursuant to this Section 9 that the
procedures and presumptions of this Agreement are not valid, binding and
enforceable and shall stipulate in any such court or before any such arbitrator
that the Corporation is bound by all the provisions of this Agreement.

          (e) If Indemnitee, pursuant to this Section 9, seeks a judicial
adjudication of or an award in arbitration to enforce his rights under, or to
recover damages for breach of, this Agreement, Indemnitee shall be entitled to
recover from the Corporation, and shall be indemnified by the Corporation
against, any and all expenses (of the types described in the definition of
Expenses in Section 14 of this Agreement) actually and reasonably incurred by
him in such judicial adjudication or arbitration, but only if he prevails
therein.  If it shall be determined in said judicial adjudication or arbitration
that Indemnitee is entitled to receive part but not all of the indemnification
or advancement of Expenses sought, the expenses incurred by Indemnitee in
connection with such judicial adjudication or arbitration shall be appropriately
prorated.

     10.                                        Security.

          (a) To the extent requested by the Indemnitee and approved by the
Board, the Corporation may at any time and from time to time provide security to
the Indemnitee for the Corporation's obligations hereunder through an
irrevocable bank line of credit, funded trust or other collateral.  Any such
security, once provided to the Indemnitee, may not be revoked or released
without the prior written consent of Indemnitee.

          (b) For each Proceeding in which Indemnitee is entitled to
indemnification, the Corporation, at the time such Proceeding is commenced,
shall deposit a minimum of One Million Dollars ($1,000,000) in an escrow account
to fund any Expenses, judgments or fines imposed in such Proceeding or any
amount paid or payable pursuant to an agreement of settlement of such
Proceeding, for or on behalf of Indemnitee pursuant to this Agreement.  In the
event a single Proceeding involves more than one Indemnitee, only one such
escrow account shall be established with respect to such Proceeding.  The
Corporation shall maintain a minimum 
<PAGE>
 
balance in each such escrow account of One
Million Dollars ($1,000,000) and shall increase such amount from time to time as
it shall deem necessary or desirable to meet the Corporation's anticipated
obligations in connection with such Proceeding, pursuant to this Agreement.  The
amount deposited by the Corporation in any such escrow account shall not limit
the Corporation's liability under this Agreement.  At the termination of any
such Proceeding, after payment of all Expenses, judgments, fines or settlement
amounts, the balance of funds remaining in the escrow account established for
such Proceeding shall be returned to the Corporation for its general purposes
and such escrow account shall be closed.

     11.                   Non-Exclusivity; Duration of Agreement; Insurance;
Subrogation.

          (a) The rights of indemnification and to receive advancement of
Expenses as provided by this Agreement shall not be deemed exclusive of any
other rights to which Indemnitee may at any time be entitled under applicable
law, the Corporation's certificate of incorporation or bylaws, any other
agreement, a vote of stockholders or a resolution of directors, or otherwise.
This Agreement shall continue until and terminate upon the latter of: (a) ten
(10) years after the date that Indemnitee shall have ceased to serve as a
director and officer of the Corporation or fiduciary of any other corporation,
partnership, joint venture, trust, employee benefit plan or other enterprise
that Indemnitee served at the request of the Corporation; or (b) the final
termination of all pending Proceedings in respect of which Indemnitee is granted
rights of indemnification or advancement of Expenses hereunder and of any
proceeding commenced by Indemnitee pursuant to Section 9 of this Agreement
relating thereto.  This Agreement shall be binding upon the Corporation and its
successors and assigns and shall inure to the benefit of Indemnitee and his
heirs, executors and administrators.

          (b) If the Corporation maintains an insurance policy or policies
providing liability insurance for directors or officers of the Corporation or
fiduciaries of any other corporation, partnership, joint venture, trust,
employee benefit plan or other enterprise that such person serves at the request
of the Corporation, Indemnitee shall be covered by such policy or policies in
accordance with the terms thereof to the maximum extent of the coverage
available for any such director or officer under such policy or policies.

          (c) If any payment is made under this Agreement, the Corporation shall
be subrogated to the extent of such payment to all of the rights of recovery of
Indemnitee, who shall execute all papers required and take all action necessary
to secure such rights, including execution of such documents as are necessary to
enable the Corporation to bring suit to enforce such rights.

          (d) The Corporation shall not be liable under this Agreement to make
any payment of amounts otherwise indemnifiable hereunder if and to the extent
that Indemnitee has otherwise actually received such payment under any insurance
policy, contract, agreement or otherwise.

     12.  Severability.  If any provision or provisions of this Agreement shall
be held to be invalid, illegal or unenforceable for any reason whatsoever (a)
the validity, legality and 
<PAGE>
 
enforceability of the remaining provisions of this
Agreement (including, without limitation, each portion of any Section of this
Agreement containing any such provision held to invalid, illegal or
unenforceable, that is not itself invalid, illegal or unenforceable) shall not
in any way be affected or impaired thereby; and (b) to the fullest extent
possible, the provisions of this Agreement (including, without limitation, each
portion of any Section of this Agreement containing any such provision held to
be invalid, illegal or unenforceable, that is not itself invalid, illegal or
unenforceable) shall be construed so as to give effect to the intent manifested
by the provision held invalid, illegal or unenforceable.

     13.  Exception to Right of Indemnification or Advancement of Expenses.
Notwithstanding any other provision of this Agreement, Indemnitee shall not be
entitled to indemnification or advancement of Expenses under this Agreement with
respect to any Proceeding, or any claim, issue or matter therein, brought or
made by him against the Corporation, except as may be provided in Section 9(e)
of this Agreement.

     14.  Definitions.   For purposes of this Agreement:

          (a) "Change in Control" means a change in control of the Corporation
of a nature that would be required to be reported in response to Item 5(f) of
Schedule 14A of Regulation 14A (or in response to any similar item or any
similar schedule or form) promulgated under the Securities Exchange Act of 1934,
as amended (the "Act"), whether or not the Corporation is then subject to such
reporting requirement; provided, however, that, without limitation, such a
Change in Control shall be deemed to have occurred if (i) any "person" (as such
term is used in Sections 13(d) and 14(d) of the Act) is or becomes the
"beneficial owner" (as defined in Rule 13d-3 under the Act), directly or
indirectly, of securities of the Corporation representing 20% or more of the
combined voting power of the Corporation's then outstanding securities without
the prior approval of at least two-thirds of the members of the Board in office
immediately prior to such person attaining such percentage interest; (ii) the
Corporation is a party to a merger, consolidation, sale of assets or other
reorganization, or a proxy contest, as a consequence of which members of the
Board in office immediately prior to such transaction or event constitute less
than a majority of the Board thereafter; or (iii) during any period of two (2)
consecutive years, individuals who at the beginning of such period constituted
the Board (including for this purpose any new director whose election or
nomination for election by the Corporation's stockholders was approved by a vote
of at least two-thirds of the directors then still in office who were directors
at the beginning of such period) cease for any reason to constitute at least a
majority of the Board.

          (b) "Corporate Status" describes the status of a person who is or was
or has agreed to become a director of the Corporation, or is or was an officer,
employee, agent or fiduciary of the Corporation or of any other corporation,
partnership, joint venture, trust, employee benefit plan or other enterprise
that such person is or was serving at the request of the Corporation.
<PAGE>
 
          (c) "Disinterested Director" means a director of the Corporation who
is not and was not a party to the Proceeding in respect of which indemnification
is sought by Indemnitee.

          (d) "Expenses" shall include all reasonable attorneys' fees,
retainers, court costs, transcript costs, fees of experts and witnesses, travel
expenses, duplicating costs, printing and binding costs, telephone charges,
postage, delivery service fees, and all other disbursements or expenses of the
type customarily incurred in connection with prosecuting, defending, preparing
to prosecute or defend or investigating a Proceeding.

          (e) "Independent Counsel" means a law firm, or a member of a law firm,
that is experienced in matters of corporation law and neither at the time of
designation is, nor in the five years immediately preceding such designation
was, retained to represent: (i) the Corporation or Indemnitee in any matter
material to either such party or (ii) any other party to the Proceeding giving
rise to a claim for indemnification hereunder.  Notwithstanding the foregoing,
the term "Independent Counsel" shall not include any person who, under the
applicable standards of professional conduct then prevailing, would have a
conflict of interest in representing either the Corporation or Indemnitee in an
action to determine Indemnitee's rights under this Agreement arising on or after
the date of this Agreement, regardless of when the Indemnitee's act or failure
to act occurred.

          (f) "Proceeding" includes any action, suit, arbitration, alternate
dispute resolution mechanism, investigation, administrative hearing an any other
proceeding (including any appeals from any of the foregoing) whether civil,
criminal, administrative or investigative, except one initiated by an Indemnitee
pursuant to Section 9 of this Agreement to enforce his rights under this
Agreement

     15.  Headings.  The headings of the Sections of this Agreement are inserted
for convenience of reference only and shall not be deemed to constitute part of
this Agreement or to affect the construction thereof.

     16.  Modification and Waiver.  This Agreement may be amended from time to
time to reflect changes in Delaware law or for other reasons.  No supplement,
modification or amendment of this Agreement shall be binding unless executed in
writing by both of the parties hereto.  No waiver of any of the provisions of
this Agreement shall be deemed or shall constitute a waiver of any other
provision hereof (whether or not similar) nor shall waiver constitute a
continuing waiver.

     17.  Notice by Indemnitee.  Indemnitee agrees promptly to notify the
Corporation in writing upon being served with any summons, citation, subpoena,
complaint, indictment, information or other document relating to any Proceeding
or matter that may be subject to indemnification or advancement of Expenses
covered hereunder; provided, however, that the failure to give any such notice
shall not disqualify the Indemnitees from indemnification hereunder.
<PAGE>
 
     18.  Notices.  All notices requests, demands, and other communications
hereunder shall be in writing and shall be deemed to have been duly given (i) if
delivered by hand and receipted for by the party to whom said notice or other
communication shall have been directed, at the time of delivery, or (ii) if
mailed by certified mail (return receipt requested) with postage prepaid, on the
third business day after the date on which it is so mailed, and addressed:

(c)                                         if to Indemnitee, to:

          Darius W. Gaskins, Jr.

          130 County Road

          Ipswich, MA  01938

(d)  if to the Corporation, to:

          UNR INDUSTRIES, INC.

          332 South Michigan Avenue

          Suite 300

          Chicago, Illinois  60604

          Attention:  Secretary

or to such other address as may have been furnished by like notice to Indemnitee
by the Corporation or to the Corporation by Indemnitee, as the case may be.

     19.  Governing Law.  The parties agree that this Agreement shall be
governed by, and construed and enforced in accordance with, the laws of the
State of Delaware applicable to contracts made and to be performed in such state
without giving effect to the principles of conflicts of laws.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the
day and year first above set forth.

                                By:          /s/ William Andrews
                                             -------------------
                                    President


                                INDEMNITEE:


                                                     /s/ Darius W. Gaskins, Jr.
                                                     --------------------------