Consider Environmental Impacts Of Preservative-Treated Wood Used In Construction

A house can last a lifetime. If another family moves in after you move out, that’s at least 100 years or more of constant use. Regular maintenance should be a concern of any homeowner, but what about the construction process that took place long before you came into the picture? Today, preservative-treated wood is being used as a way to combat deterioration due to wood destroying insects or fungi.   Preservative-treated wood has a long history of extending the service life of houses and other industrial products such as poles and crossties.  Some metal-based preservatives have been closely examined for possible adverse effects on human health and the environment.  

All preservatives used in the treatment process are periodically evaluated for registration by the EPA and some have been voluntarily withdrawn for residential applications such as chromated copper arsenate (CCA).  Therefore, some older and since-banned materials do end up in landfills. At issue today is the environmental impacts of preservative-treated wood, alternatives to landfills and developing metal-free preservatives.  My research has shown that properly treated CCA wood leaches an insignificant amount in service.  For more information on some of these efforts please visit and click on publications.  

The industry has been proactive to fund research efforts that remove and reuse heavy metals from decomissioned preservative-treated wood.  CCA can be effectively removed from spent wood using a process known as microwave-assisted liquefaction.  The process is a closed loop, economical, and results in no waste streams.

About the Author:

Todd Shupe is the President of and is a well recognized expert on wood-based housing and building materials, wood decay and degradation, 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 President of the Baton Rouge District of United Methodist Men, and Board Member for Gulf South Men and a Team Leader for The Kingdom Group. He is a volunteer for the Walk to Emmaus, Grace Camp, and Iron Sharpens Iron. Todd is a Men’s Ministry Specialist through the General Commission of United Methodist Men and is in training to be a Certified Lay Minister through the Louisiana Conference of the United Methodist Church.