SAN FRANCISCO – April 2, 2007 - Genstar Capital, LLC, a middle market private equity firm that focuses on investments in selected segments of the industrial technology, life sciences and business services sectors, today announced that it has
completed its previously announced acquisition of International Aluminum Corporation (NYSE: IAL), a leading manufacturer of residential and commercial aluminum building materials. The transaction is valued at $228 million.

"We invest in areas that we know and where we feel we can add value post acquisition,” said Darren J. Gold, a Managing Director of Genstar Capital. “IAL is in the sweet spot of our investment focus because it operates in the building products industry which is a sector we understand and where we have previously created value. That is a reason we are able to complete this acquisition in a very timely manner and we now look forward to implementing initiatives to further grow the business.”

Founded in 1957, International Aluminum is based in Monterey Park, CA and has three primary business lines: Its commercial division manufactures decorative entrance doors, store fronts, window and curtain walls, windows and impact and blast-resistant
systems; the residential division manufactures a broad line of vinyl and aluminum windows and doors, most of which are used in replacement or remodeling applications; and the Company’s extrusion operations manufacture mill finish, anodized and painted
extruded aluminum products for internal and external uses. The Company has approximately 1,600 employees with operations conducted from 15 North American manufacturing facilities.

Genstar Capital, LLC
Genstar’s investments in the building products industry include Gentek Building Products, Inc., a manufacturer of aluminum and vinyl siding, windows and doors; Wolverine Tube, Inc., a leading manufacturer of copper and copper alloy tube; and Panolam International, Inc., a manufacturer of decorative laminates used in both residential and commercial applications.

About Genstar Capital, LLC
Based in San Francisco, Genstar Capital (www.gencap.com) is a private equity investment firm that makes leveraged investments in quality middle-market companies. Genstar Capital works in partnership with management to transform its portfolio companies into industry-leading businesses. With more than $900 million of committed capital under management and significant experience investing in businesses, Genstar focuses on selected segments of the life sciences, business services, and industrial technology sectors.

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