Press Release

June 23, 2006

Simpson Manufacturing Co., Inc. Announces Officer Changes in Subsidiary, Officer and Director Planned Retirement

Pleasanton, CA -- Simpson Manufacturing Co., Inc. (the "Company") announced today that, effective August 1, 2006, Phillip "Terry" Kingsfather has accepted the position of President and Chief Operating Officer of the Company's subsidiary, Simpson Strong-Tie Company Inc., to succeed Stephen Lamson. Mr. Lamson has informed the Company that he intends to retire in 2007. Until then, Mr. Lamson intends to continue as Vice President and a Director of the Company. He will work with Mr. Kingsfather in the transition of responsibilities of President and Chief Operating Officer of Simpson Strong-Tie Company Inc.

Phillip "Terry" Kingsfather, age 59, is currently the Vice President of Simpson Strong-Tie for the Anchor Systems product line and has been with the Company for 27 years. His career with the Company started in 1979 as an outside sales representative in the Pacific Northwest for Simpson Strong-Tie Company Inc., after which, in 1985, he moved on to regional sales manager. He joined the Anchor Systems sales team in 1997 and was instrumental in the roll-out of this product line. Prior to being appointed Vice President in 2004, he had focused on sales to Anchor Systems national accounts.

Simpson Manufacturing Co., Inc., headquartered in Pleasanton, California, through its subsidiary, Simpson Strong-Tie Company Inc., designs, engineers and is a leading manufacturer of wood-to-wood, wood-to-concrete and wood-to-masonry connectors, fastening systems and pre-fabricated shearwalls. Simpson Strong-Tie also offers a full line of adhesives, mechanical anchors and powder actuated tools for concrete, masonry and steel. The Company's other subsidiary, Simpson Dura-Vent Company, Inc., designs, engineers and manufactures venting systems for gas and wood burning appliances. The Company's common stock trades on the New York Stock Exchange under the symbol "SSD."

For further information, contact Barclay Simpson at (925) 560-9032.

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