CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in Registration Statement No. 333-144500 on Form S-3 and Registration Statement No. 333-141663, No. 333-141662, No. 333-90726, No. 333-90724, No. 033-61073, No. 033-61075, No.
333-27967 and No. 333-42648 on Form S-8 of our reports dated October 30, 2009, relating to the
consolidated financial statements and financial statement schedule of Commercial Metals Company and subsidiaries and the
effectiveness of Commercial Metals Company and subsidiaries internal control over financial
reporting, appearing in this Annual Report on Form 10-K of Commercial Metals Company for the year
ended August 31, 2009.
/s/ Deloitte & Touche LLP
October 30, 2009