• Western Wood Preservers Institute

  Headquartered in Vancouver, Washington, the Western Wood Preservers Institute (WWPI) is a nonprofit member trade organization representing the interests of the preserved wood products industry throughout western North America for nearly 75 years.

• Western Wood Preservers Institute

• American Wood Preservers Institute

• American Wood Products, Inc.

• Canadian Wood Council

• Cedar Shake & Shingle Bureau

• Gunnison Garage Door, Inc.

• Hickson Corp.

• Homasote Company

• Hoover Treated Wood Products

• J.H. Baxter & Co.

• Lamboo® Incorporated

• Osmose Wood Preserving

• Permapost Products Co.

• Southern Milling & Lumber

• Texas Woods

• Viance

• Woodmaster Foundations