Benefits of CCA-Treated Wood

Our highway and interstate system is a critical component of our nation’s infrastructure and economy. These are essential for the transportation of goods and services, emergency responders, commuting to work and family vacations. It is imperative that our highways provide safe travel for all. Highway guardrails, as you can see, are an important safety component of our highways. They typically consist of a galvanized metal rail, treated wood block, treated wood post and fasters. However, steel blocks and posts can also be used.

Chromated copper arsenate (CCA) has a long history as an EPA-approved wood preservative for numerous applications such as posts and blocks used in the guardrail assembly. Numerous independent studies have shown that CCA is an environmentally-safe wood preservative and has very minimal leaching.

Dr. Kenneth Brooks wrote in Pressure Treated Wooden Utility Poles and Our Environment, “pressure-treated wood utility poles pose no greater risk to the environment than growing the wheat used to bake your next loaf of bread, and present far less personal risk than driving to your local grocery store to purchase that bread.” Similarly, Dr. Paul Morris has written, “There are environmental risks associated with everything we do and with all of the material used to construct utility structures. For instance, the leaching of zinc from steel utility poles.”

The Treated Wood Council commissioned an independent study of the environmental impacts associated with the national production, use and disposition of treated wood and galvanized steel highway guard rail posts using life cycle assessment (LCA) methodologies. The results for treated wood compared to galvanized steel guard rail posts were significant (© Treated Wood Council, 2013).

  • Less Energy and Resource Use: Treated wood highway guard rail posts require less total energy and less fossil fuel than galvanized steel highway guard rail posts.
  • Lower Environmental Impacts: Treated wood highway guard rail posts have lower environmental impacts than galvanized steel highway guard rail posts in five of six impact indicator categories assessed: anthropogenic greenhouse gas, total greenhouse gas, acid rain, ecotoxicity, and smog-causing emissions.
  • Offsets Fossil Fuel Use: Reuse of treated wood highway guard rail posts for energy recovery will offset the use of fossil fuel energy and thereby reduce greenhouse gas levels in the atmosphere.

Here’s the bottom line – CCA-treated wood is a critical part of our nation’s infrastructure and economy. It is safe for the environment and has a long history of EPA approval for both the environment and human exposure.”

The alternatives (steel and concrete) are not renewable and require more energy to produce than CCA-treated wood, he adds. Last but not least, CCA-treated wood is more cost effective than the alternatives. CCA-treated wood is good for the environment and the economy!

Meet the Author

Todd Shupe is the President of and is a well recognized expert on wood-based housing and wood science.  Shupe worked as a  professor and lab director at LSU for over 20 years. He is active in several ministries including his Christian blog Todd is the Secretary of the Baton Rouge District of United Methodist Men, Database Coordinator for Gulf South Men, and volunteer for the Walk to Emmaus, Grace Camp, Iron Sharpens Iron, Open Air Ministries, HOPE Ministries food pantry. Todd is currently preparing to be a Men’s Ministry Specialist through the General Commission of United Methodist Men.