About Western Wood Preservers Institute - WWPI

Headquartered in Vancouver, Washington, the Western Wood Preservers Institute (WWPI) is a nonprofit member trade organization representing the interest of the preserved wood products industry throughout western North America for more than 60 years. The membership consists of companies that either manufacture products, are directly affiliated or provide a service to the preserved wood industry. The primary activity areas of the WWPI include regulatory and market outreach programs aimed at sustaining a viable western North America preserved wood industry.

Get smart on Treated Wood with the new WWPI app!


WWPI has just released a free interactive smartphone app for treated wood specifiers, suppliers, users and inspectors. This new app will allow you to look up the commodity, application and exposure environment for treated wood products and find out the required retention by the AWPA and the CheckMark third party inspection details on the end tag.

In addition the app allows you to look up the Treated Wood Council's life cycle assessments (LCA) comparing treated wood vs. substitutes as published by different peer reviewed journals. The app also provides information on different WWPI programs, EPA approved preservatives, fire retardants and safe handling and answers frequently asked questions (FAQ).  The app will soon include a search services for treated lumber yards near your location.

The app will allow an architect or engineer to search, review and specify the proper AWPA Use Category for a designed application. Contractors will be able to look up the Use Category and get quotes from the lumberyard on specific preservatives that meet the proper retention. Building officials and code inspectors can verify the end tags on treated lumber or plywood to ensure they meet the proper standards.

Utilizing the app will help the entire building process by streamlining one of the more confusing operations and improve the knowledge about and use of preserved wood products.

The app is available on all tablet and smartphone operating systems, through the iTunes Store for iPhones and iPads and the Google Play Store for Android phones and tablets. Also avaiable is an HTML5 version for Microsoft and Blackberry users. Scan the QR code below to download it.


Scan for Android App

Scan for Apple iOS App

Scan for HTML5 App

Treated Wood featured on DIY Network

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Deconstruction was a television series that appeared on the Do-It-Yourself Network exploring the science behind home improvement. In 2009, show producers asked WWPI for help to develop a show to demonstrate the science behind pressure treated wood. The segment opens at one of WWPI’s treater members – Allweather Wood plant in Colorado – and describes the wood treating process. At 9 minutes and 30 seconds they show the durability and termite test results. There is also a later segment on fire retardants, starting at 16 minutes and 30 seconds.

This is a great educational and fun video to watch.We hope you enjoy it and share it with others.

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Check out our YouTube Channel

Take a look at our YouTube Channel for the latest videos on treated lumber.

Preview our newest video on the process of treating wood. This 3-minute, professionally produced video highlights how products are pressure treated and features WWPI Member companies explaining the many advantages of treated wood.



Webinar Details!

Please check back for updated information on the next woodpoles.org webinar sponsored by the NAWPC.


WWPI Purpose Statement

To support and sustain the production and use of treated wood products manufactured in western North America.

WWPI Mission Statement

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It is the WWPI mission to protect and promote the manufacture and markets for preservative treated wood products produced by the industry in western North America. This shall be accomplished through coordinated industry strategies, utilizing the best scientific information available to:
  • Increase public and consumer appreciation and confidence in our products and our industry;
  • Secure reasonable and economic federal, state, provincial and local environmental regulation regarding our products and processes;
  • Promote the development and application of codes, standards and Quality Assurance programs to ensure products best meet the needs of the users.

WWPI Environmental Code

Members of WWPI share the public concerns for a sound economy, healthy environment and good stewardship of all natural resources.
To that end, the members strive to achieve the following principals:
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  • To produce high quality products which, when used as intended, will
    significantly extend the useful life of the treated wood material.
  • To operate facilities in a manner which meets or exceeds applicable federal, state or provincial regulations.
  • To support and utilize research aimed at developing products and processes which are consumer and environmentally friendly.
  • To participate in the development of public regulations and product standards which are based on sound scientific information and balance the long term need for a strong economy and healthy environment.
  • To actively support the reuse and recycling of treated wood products.


The Western Wood Preservers Institute believes the information contained on this Web Site to be based on up-to-date scientific and economic information and is intended for general informational purposes. In furnishing this information, the Institute make no warranty or representation, either expressed or implied, as to the reliability or accuracy of such information; nor does the Institute assume any liability resulting from use of or reliance upon the information by any party. This document should also not be construed as a specific endorsement or warranty, direct or implied, of treated wood products or preservatives, in terms of performance, environmental impact, or safety. The information contained herein should not be construed as a recommendation to violate any federal, provincial, state or municipal law, rule or regulation, and any party using or producing pressure treated wood products should review all such laws, rules or regulations prior to using or producing treated wood products.

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