EXHIBIT A JOINT FILING AGREEMENTJoint Filing Agreement • September 17th, 2007 • Highland Capital Management Lp • Industrial inorganic chemicals
In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13D and Schedule 13G (including amendments thereto) with regard to the Common Stock of Georgia Gulf Corporation, a Delaware corporation, and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Joint Filing Agreement as of September 17, 2007.
