Exhibit 32.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF

THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of International Aluminum Corporation (the “Company”) on Form 10-Q for the period ended December 31, 2006, as filed with the Securities and Exchange Commission (the “Report”), we the undersigned certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to our knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 7, 2007		/S/ RONALD L. RUDY
		Ronald L. Rudy
		President and
		Chief Executive Officer


Date: February 7, 2007		/S/MITCHELL K. FOGELMAN
		Mitchell K. Fogelman
		Senior Vice President — Finance
		and Chief Financial Officer