About Georgia GulfGeorgia Gulf Corporation is a leading, integrated North American manufacturer of two chemical lines, chlorovinyls and aromatics, and manufactures vinyl-based building and home improvement products. The Company’s vinyl-based building and home improvement products, marketed under Royal Building Products and Exterior Portfolio brands, include window profiles, patio doors, mouldings, siding, pipe and pipe fittings, soffit, rain ware and decking. Georgia Gulf, headquartered in Atlanta, Georgia, has manufacturing facilities located throughout North America to provide industry-leading service to customers. For more information, visit www.ggc.com. Georgia Gulf Corporation announced January 14, 2013, that when its pending merger with PPG Industries, Inc.’s commodity chemicals business is completed, the combined organization will be Axiall Corporation and will be traded on the New York Stock Exchange under the ticker symbol of AXLL. More information about Axiall and the pending company’s brand story can be found at www.axiallcorp.com. Additional Information and Where to Find it This communication does not constitute an offer to buy, or solicitation of an offer to sell, any securities of the Company, and no offer or sale of such securities will be made in any jurisdiction where it would be unlawful to do so. In connection with the Transactions (as defined in the Offer to Purchase), the Company has filed with the Securities and Exchange Commission (“ SEC”) a registration statement on Form S-4 relating to the Transactions. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE PROSPECTUS FORMING PART OF THE REGISTRATION STATEMENT, AND ANY OTHER RELEVANT DOCUMENTS BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE COMPANY, PPG INDUSTRIES, INC.’S COMMODITY CHEMICALS BUSINESS AND THE TRANSACTIONS. Investors and security holders will be able to obtain these materials and other documents filed with the SEC free of charge at the SEC’s website, www.sec.gov. In addition, copies of the registration statement may be obtained free of charge by accessing the Company’s website at www.ggc.com by clicking on the “Investors” link and then clicking on the “SEC Filings” link, or upon written request to Georgia Gulf Corporation at 115 Perimeter Center Place, Suite 460, Atlanta, Georgia 30346, Attention: Investor Relations. Shareholders may also read and copy any reports, statements and other information filed by the Company with the SEC, at the SEC public reference room at 100 F Street, N.E., Washington D.C. 20549. Please call the SEC at 1-800-SEC-0330 or visit the SEC’s website for further information on its public reference room.