ClarkDietrich™ Building Systems Products Are Certified Code Compliant

September 19, 2011

RE: ClarkDietrich™ Building Systems Products Are Certified Code Compliant

To our customers,

ClarkDietrich™ Building Systems products are certified code compliant through a number of agencies including the ICC Evaluation Service, Underwriter's Laboratories (UL), IAPMO Evaluation Services, Architectural Testing, Inc. and the NAHB Research Center.

American Metal Market to Provide SFIA with Steel Price Forecasts

September 19, 2011 — The Steel Framing Industry Association (SFIA) and the American Metal Market (AMM) have entered into a joint marketing agreement to provide SFIA members access to AMM forecasting information via the SFIA website's "Members Only" section. As part of the arrangement the AMM will also offer special discounts to SFIA members for AMM information products and services.

Top Ranking Steel Framing Manufacturers Unite as ClarkDietrich™ Building Systems

March 10, 2011 - West Chester, OH - ClarkWestern Building Systems and Dietrich Metal Framing have united to form ClarkDietrich Building Systems. By aligning the two market leaders in the metal framing industry, ClarkDietrich Building Systems (www.clarkdietrich.com) now offers the most comprehensive steel framing product line and engineering services in North America.

Worthington's News Release

Dietrich and ClarkWestern to Form Joint Venture
Worthington to acquire service center assets of MISA Metals, Inc.

February 22, 2011 - Columbus, OH - Worthington Industries, Inc. (NYSE: WOR) announced today that it has reached an agreement in principle with Marubeni-Itochu Steel America Inc. (MISA) to combine Dietrich Metal Framing and ClarkWestern Building Systems in a newly-formed joint venture.

ClarkWestern and Dietrich Metal Framing to Form Joint Venture. Worthington to Acquire Service Center Assets of MISA Metals, Inc.

February 22, 2011 - New York, NY — Marubeni-Itochu Steel America Inc. (MISA) and Worthington Industries, Inc. (NYSE: WOR) announced today that they have reached an agreement in principle to combine ClarkWestern Building Systems and Dietrich Metal Framing in a newly-formed joint venture. In the transaction, MISA will acquire a 75 percent interest of the joint venture, and Worthington will acquire a 25 percent interest. As part of the exchange, Worthington will also acquire the assets of the non-automotive service center business of MISA Metals, Inc.