FEATURING OUR EFFORTS TO BECOME A HIGHER-PERFORMING ORGANIZATION SEPTEMBER 2012 Integraon Teams Begin Process of Building a Unified Organizaon When two companies are combined — such as the proposed merger of Georgia Gulf and PPG’s chlor-alkali and derivaves business — countless issues must be addressed to ensure a successful launch: things like making sure employees get paid as payroll systems are combined and working with local ulies to ensure that the new company’s supply of power and water will not be interrupted. Funconal and operaonal leaders from the two companies began the process of idenfying essenal Day One acvies as a first step in preparing to integrate the organizaons once the merger is approved and launched. The areas of focus include: Environmental, Health and Safety Finance and Accounng Financial Planning and Analysis Human Resources IT and Transion Services “We have a unique opportunity to create a company like no other in the chlor-alkali industry,” Joe Breunig, Georgia Gulf’s execuve vice president-chemicals, told aendees of the inial Integraon Team Leader meeng. Breunig challenged the Integraon Team Leaders to pursue “excellence in everything we do. We have an opportunity to do things differently and beer by ulizing each company’s best pracces. We are creang a foundaon that 6,000 employees will be working from and building on as we move through the integraon, so any me we have an opportunity to pick a beer way, we need to do so.” In the coming weeks, the Integraon Team Leaders will begin creang sub-teams to handle specific issues within their funcons. Over me, hundreds of employees from both companies will play a key role in integraon planning and implementaon. As a first step toward integrang the two companies, the meeng provided an opportunity for employees from each organizaon to gain a beer understanding of their counterparts’ businesses and products. A key takeaway was the fact that the new company will have a broad porolio of products with extensive assets along both the chlorovinyls and chlor-alkali chains. “Once the merger is completed, we will have the luxury of deciding where along that chain of products that we can extract the most value,” said Paul Carrico, president and CEO of Georgia Gulf — and the new company. To maximize value in the near term, the Integraon Teams are looking for ways to achieve the synergies expected to come from the merger during the first 24 months. “The success of this merger will be measured by our ability to deliver on those synergies,” Carrico said. He added, however, that unlike many mergers, headcount reducons are not expected to contribute major savings. (connued on page 2) Also in this issue: . RiechesBaird has been selected to help create a corporate brand strategy for the new company. page 2 If you have quesons or comments about the content of this newsleer or Georgia Gulf’s Build the Future iniaves, contact Alan Chapple, Director of Corporate Communicaons, at chapplea@ggc.com. Monthly quiz: What are some of the benefits and opportunies expected from the merger? The 5th employee to email the correct answer to chapplea@ggc.com will win a Build the Future coffee mug. Congratulaons to July quiz winner Jerry Chan, senior financial systems analyst in Atlanta. Legal Operaons and Technology Procurement Sales and Markeng Supply Chain “Creang a Fortune 500 company was not our intent, but when you look at the opportunies, this merger is the best I have seen in our industry.” Paul Carrico President and CEO, Georgia Gulf “We are combining one and one and geng three.” Tim Mann EVP & General Counsel, Georgia Gulf “We have a unique opportunity to create a company like no other in the chlor-alkali industry.” Joe Breunig EVP-Chemicals, Georgia Gulf

SEPTEMBER 2012 PAGE 2 (connued from page 1) “In many deals, the eliminaon of posions accounts for signifi- cant synergies. That’s not the case here,” Carrico said. “There will be some overlap of jobs in a few areas, and we will need to deal with that. But we need talent, and the ability to combine the skills and experience of both companies is one of the most compelling reasons for this merger.” Another Day One personnel issue is compensaon and benefits. “With 6,000 employees in two companies, we need to make sure that we have processes in place to ensure everyone gets paid on Day One,” said James Worrell, Georgia Gulf vice president of human resources. “Beyond Day One, we will also be working on integrang our benefits programs, which are similar but certainly have some differences.” Worrell said that current benefits offerings should remain largely intact for the PPG employees through 2013. “Beyond that, we have me to work on this to develop a new offering of benefits that is compeve for employees and meets the needs of the company in terms of cost and our ability to aract and retain people,” Worrell said. RiechesBaird Selected as Corporate Branding Partner Signage. Business cards. Leerhead. Email and website addresses. Countless items will be needed to launch the company once the merger between Georgia Gulf and PPG’s chlor-alkali and derivaves business is approved and consummated. A common thread in each element is the need for a new company name. In August, Georgia Gulf’s execuve team approved the selecon of RiechesBaird to serve as our corporate strategic branding consultant. “When we launched the effort to hire a branding partner, we wanted to find a company that knows business — business, in general, as well as the chemicals business,” said Alan Chapple, facilitator of the Corporate Brand Strategy Team. “We also wanted a firm that could help us create a new name, logo and corporate identy that would energize our employees, capvate our customers, and resonate with shareholders and other external audiences.” RiechesBaird is a naonally recognized specialist in business-to-business branding. The company has deep experience in helping companies to define and communicate new business realies in mes of dynamic change. “The brand will help give form and substance to this excing opportunity to create an enrely new and different kind of company,” said Alan Brew, a principal at RiechesBaird. “The brand will help the new company reinforce its vision of becoming an integrated chemicals and building products powerhouse,” Brew said. To help develop a brand that captures the essence of the new company and the importance of our products, RiechesBaird will survey employees of both companies, as well as customers and other outside stakeholders. The goal is to present inial branding recommendaons to the steering team by mid- October and to gain execuve approval by November 1. The steering team includes three members from each company. From Georgia Gulf: Bill Doherty, vice president- PVC compounds; Jennifer McGill, Royal’s group markeng director; and Josh Wierzba, pricing analyst-vinyl resins. PPG’s members include Sharon Piciacchio, vice president-chlor-alkali markeng, services, and calcium hypochlorite and global supply chain; Wayne Gasior, senior director-strategic accounts and interna- onal; and Frank Schiffman, markeng manager-calcium hypochlorite. “The brand will help the new company reinforce its vision of becoming an integrated chemicals and building products powerhouse.” — Alan Brew, RiechesBaird Cauonary Statements Regarding Forward-Looking Informaon This communicaon contains certain statements relang to future events and our intenons, beliefs, expectaons, and predicons for the future. Any such statements other than statements of historical fact are forward-looking statements within the meaning of the Securies Act of 1933 and the Securies Exchange Act of 1934. These forward-looking statements include, but are not limited to, statements regarding expected benefits of the merger of Georgia Gulf and the chlor-alkali and derivaves business of PPG (the “Merger”), integraon plans and expected synergies therefrom, the expected ming of compleon of the Merger, and Georgia Gulf’s ancipated future financial and operang performance and results, including its esmates for growth. These statements are based on the current expectaons of the management of Georgia Gulf. There are a number of risks and uncertaines that could cause Georgia Gulf’s actual results to differ materially from the forward-looking statements included in this communicaon. These risks and uncertaines include risks relang to the pares’ respec- ve abilies to obtain all necessary approvals to complete, and to otherwise complete, the Merger and to achieve the expected benefits therefrom. In light of these risks, uncertaines, assumpons, and other factors inherent in forward-looking statements, actual results may differ materially from those discussed in this communica- on. Other unknown or unpredictable factors could also have a material adverse effect on Georgia Gulf’s actual future results, performance, or achievements. For a further discussion of these and other risks and uncertaines applicable to Georgia Gulf and its business, see Georgia Gulf’s Annual Report on Form 10-K for the fiscal year ended December 31, 2011 and subsequent filings with the Securies and Exchange Commission (the “SEC”). As a result of the foregoing, readers are cauoned not to place undue reliance on these forward-looking statements, which speak only as of the date of this communicaon. Georgia Gulf expressly disclaims any duty to update any forward-looking statement whether as a result of new informa on, future events, or changes in its expectaons, except as required by law. Addional Informaon In connecon with the Merger, Georgia Gulf will file with the SEC a registraon statement on Form S-4 that will include a proxy statement and prospectus of Georgia Gulf relang to the Merger. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT AND PROXY STATEMENT/PROSPECTUS, AND ANY OTHER RELEVANT DOCUMENTS, WHEN THEY BECOME AVAILABLE, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT GEORGIA GULF, THE BUSINESS AND THE MERGER. Investors and security holders will be able to obtain these materials (when they are available) and other documents filed with the SEC free of charge at the SEC’s website, www.sec.gov. In addion, copies of the registraon statement and proxy statement/prospectus (when they become available) may be obtained free of charge by accessing Georgia Gulf’s website at www.ggc.com by clicking on the “Investors” link and then clicking on the “SEC Filings” link, or upon wrien request to Georgia Gulf at Georgia Gulf Corporaon, 115 Perimeter Center Place, Suite 460, Atlanta, Georgia 30346, Aenon: Investor Relaons. Shareholders may also read and copy any reports, statements and other informaon filed by Georgia Gulf 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 informaon on its public reference room. Georgia Gulf, PPG, and certain of their respecve directors, execuve officers and other members of management and employees may be deemed to be parcipants in the solicitaon of proxies from shareholders in respect of the Merger under the rules of the SEC. Informaon regarding Georgia Gulf’s directors and execuve officers is available in its 2011 Annual Report on Form 10-K filed with the SEC on February 24, 2012, and in its definive proxy statement filed with the SEC on April 16, 2012 in connecon with its 2012 annual meeng of stockholders. Informaon regarding PPG’s directors and execuve officers is available in its 2011 Annual Report on Form 10-K filed with the SEC on February 16, 2012, and in its definive proxy statement filed with the SEC on March 8, 2012 in connecon with its 2012 annual meeng of stockholders. Other informaon regarding the parcipants in the proxy solicitaon and a descrip- on of their direct and indirect interests, by security holdings or otherwise, will be contained in the registraon statement and proxy statement/prospectus and other relevant materials to be filed with the SEC when they become available.