POWER OF ATTORNEY

	Know all by these presents, that the undersigned hereby constitutes
and appoints each of, ANN  J. BRUDER, LOUIS A. FEDERLE, REBECCA N. HEFFINGTON,
PAUL KIRKPATRICK, WILLIAM B. LARSON,  and MURRAY R. McCLEAN, signing singly,
 the undersigneds true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the undersigneds
capacity as an officer and/or director of Commercial Metals Company (the
Company), Forms 3, 4, and 5 in accordance with Section 16(a) of the
securities Exchange Act of 1934 and the rules hereunder;
(2) do and perform any and all acts for and on behalf of the undersigned
 which may be necessary or desirable to complete and execute any such
Form 3, 4 or 5, complete and execute any amendment or amendments thereto,
and timely file such form with the United States Securities and Exchange
Commission and any stock exchange or similar authority; and

(3) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit
to, in the best interest of, or legally required by, the undersigned, it
being understood that the documents executed by such attorney-in-fact on
 behalf of the undersigned pursuant to this Power of Attorney shall be in
such form and shall contain such terms and conditions as such attorney-in-
fact may approve in such attorney-in-facts discretion.

        The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing whatsoever
 requisite, necessary, or proper to be done in the exercise of any of the
rights and powers herein granted, as fully to all intents and purposes as
the undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-facts substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of
the undersigned, are not assuming, nor is the Company assuming, any of the
undersigneds responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.

	This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4 or 5 with respect
to the undersigneds holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 1st day of February, 2010.

					__________________________________
					TRACY L. PORTER