Georgia Gulf Corporation (NYSE:GGC) today announced that a favorable private letter ruling has been received by PPG Industries from the U.S. Internal Revenue Service with respect to the previously announced separation of PPG’s commodity chemicals business and subsequent merger of a newly formed company owning the commodity chemicals business (“Splitco”) with a subsidiary of Georgia Gulf Corporation. The receipt of the ruling is a closing condition and an important milestone in moving towards completion of the transaction. As previously disclosed, the Georgia Gulf Board of Directors has called a special meeting to be held on January 10, 2013, for shareholders of record on November 26, 2012, to approve the issuance of Georgia Gulf shares in the proposed merger with PPG’s commodity chemicals business and to approve other matters described in the proxy statement dated December 6, 2012. If approved by Georgia Gulf’s shareholders at the special meeting, the merger is expected to close in late January 2013. The terms of the proposed transaction call for PPG to form a new company by separating its commodity chemicals business through a spinoff or split off, and then immediately thereafter merging that business with a Georgia Gulf subsidiary in a Reverse Morris Trust transaction. The proposed merger would result in PPG shareholders receiving approximately 50.5 percent of the shares of the merged company (“The Newly Merged Company”), with existing Georgia Gulf shareholders owning approximately 49.5 percent of The Newly Merged Company. About Georgia Gulf Georgia 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. Safe Harbor This communication contains certain statements relating to future events and our intentions, beliefs, expectations, and predictions for the future. Any such statements other than statements of historical fact are forward-looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. Words or phrases such as “will likely result,” “are expected to,” “will continue,” “is anticipated,” “we believe,” “we expect,” “estimate,” “project,” “may,” “will,” “intend,” “plan,” “believe,” “target,” “forecast,” “would” or “could” (including the negative or variations thereof) or similar terminology used in connection with any discussion of future plans, actions, or events, including with respect to the proposed separation of PPG’s commodity chemicals business from PPG and the merger of the PPG commodity chemicals business and Georgia Gulf (the “Transaction”), generally identify forward-looking statements. These forward-looking statements include, but are not limited to, statements regarding the expected benefits of the Transaction, and the expected timing of completion of the Transaction, and Georgia Gulf’s anticipated future financial and operating performance and results, including its respective estimates for growth. These statements are based on the current expectations of the management of Georgia Gulf. There are a number of risks and uncertainties that could cause Georgia Gulf’s actual results to differ materially from the forward-looking statements included in this communication. These risks and uncertainties include risks relating to (i) Georgia Gulf's ability to obtain requisite shareholder approval to complete the Transaction, (ii) PPG being unable to obtain necessary tax authority and other regulatory approvals required to complete the Transaction, or such required approvals delaying the Transaction or resulting in the imposition of conditions that could have a material adverse effect on the combined company or causing the companies to abandon the Transaction, (iii) other conditions to the closing of the Transaction not being satisfied, (iv) a material adverse change, event or occurrence affecting Georgia Gulf or the PPG commodity chemicals business prior to the closing of the Transaction delaying the Transaction or causing the companies to abandon the Transaction, (v) problems arising in successfully integrating the businesses of the PPG commodity chemicals business and Georgia Gulf, which may result in the combined company not operating as effectively and efficiently as expected, (vi) the possibility that the Transaction may involve other unexpected costs, liabilities or delays, (vii) the businesses of each respective company being negatively impacted as a result of uncertainty surrounding the Transaction, (viii) disruptions from the Transaction harming relationships with customers, employees or suppliers, and (ix) uncertainties regarding future prices, industry capacity levels and demand for Georgia Gulf’s products, raw materials and energy costs and availability, feedstock availability and prices, changes in governmental and environmental regulations, the adoption of new laws or regulations that may make it more difficult or expensive to operate Georgia Gulf’s businesses or manufacture its products before or after the Transaction, Georgia Gulf’s ability to generate sufficient cash flows from its business before and after the Transaction, future economic conditions in the specific industries to which its products are sold, and global economic conditions.