EXHIBIT 99.1 GULF ISLAND FABRICATION, INC. P.O. Box 310 583 Thompson Road Houma, Louisiana 70361-0310 Phone (985) 872-2100 VIA EDGAR TRANSMISSION Securities and Exchange Commission 450 Fifth Street, NW Washington, D.C. 20549 Re: Gulf Island Fabrication, Inc. Certification of Contents of Form 10-K for the period ending December 31, 2002, pursuant to Section 906 of the Sarbanes- Oxley Act of 2002 Ladies and Gentlemen: Gulf Island Fabrication, Inc. filed today, via EDGAR, its annual report on Form 10-K for the period ending December 31, 2002. The undersigned, who are the Chief Executive Officer and Chief Financial Officer of the Company, respectively, certify that the Form 10-K fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934, and that the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company for the period covered by such report. Very truly yours, By: /s/ Kerry J. Chauvin ------------------------------------------- Kerry J. Chauvin Chief Executive Officer By: /s/ Joseph P. Gallagher, III ------------------------------------------- Joseph P. Gallagher, III Chief Financial Officer A signed original of this written statement required by Section 906 has been provided to Gulf Island Fabrication, Inc. and will be retained by Gulf Island Fabrication, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.