USG Corporation to Participate in the CL King & Associates Best Ideas Conference 2008 in New York

James S. Metcalf, President and COO of USG Corporation, a leading building products company, will speak on Thursday, September 18, 2008 at the CL King & Associates Best Ideas Conference 2008 at the Omni Berkshire Place Hotel in New York. The presentation is scheduled to begin at approximately 8:30 a.m. Eastern Time. A live Webcast of the presentation may be accessed from the investor information page of the USG Corporation Website at http://investor.usg.com. The Webcast will be archived and available on the Investor Information Web page until Friday, September 26.

To listen to the live event, participants must have a multimedia computer and Windows Media Player software. To download the software prior to the event, participants should visit http://investor.usg.com, click on the Webcast link, complete the registration form and then click Help. Participants should access the Webcast event page at least 15 minutes before the live event.

USG Corporation is a Fortune 500 manufacturer and distributor of high-performance building systems primarily through its United States Gypsum Company, USG Interiors, Inc. and L&W Supply Corporation subsidiaries. Headquartered in Chicago, USG serves the residential and non-residential construction markets, repair and remodel construction markets, and industrial processes. USG’s wall, ceiling, flooring and roofing products provide leading-edge building solutions for customers, while L&W Supply center locations efficiently stock and deliver building materials nationwide. For additional information, visit the USG Web site at www.usg.com.