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KDAT Treated Lumber

What is KDAT Treated Lumber

When southern pine is treated, it undergoes a process in which it is soaked with a liquid solution of copper azole preservative. At this point this “wet” board is either shipped out to consumers, or it undergoes a drying process called KDAT.  KDAT or Kiln Dried After Treatment, is a method in which lumber is dried in a controlled environment before being sold. The KDAT process takes place in a giant kiln where controlled temperatures combined with airflow between each board, ensures the lumber is dried uniformly. Traditional decking without this extra step often take 8 months to a year to dry out, making it less desirable as it is exposed to the harsh sun and environment for that drying time. The boards are more likely to cup due to the top surface drying out faster than the bottom. Deck boards will often start to grey since they aren’t sealed for protection. It is recommending that KDAT decking is stained immediately after installation to ensure maximum protection.

Below are some of the benefits of using KDAT Lumber:

  • -Ability to be immediately or pre-stained without waiting months for wet treated wood to dry naturally.
  • -Fast staining reduces twisting, cupping, and warping
  • -Less shrinkage problems
  • -Lighter material
  • -Environmentally sound; less leaching possibility since re-drying assures maximum fixation within the wood.
  • -Better fastener holding power

David Pfeiffer

Project Developer

About the Author

Hello! I’m David, one of the Project Developers here at Woodland Deck Company. Before Woodland, I obtained my bachelor's degree from The Ohio State University and worked in the landscape industry. Outside of work I enjoy soccer, golf, and pretty much anything to do with the outdoors. On weekends, my wife and I enjoy spending time with family and volunteering for our church’s youth group. The thing I like most about Woodland Deck is the great group of people I get to work with on a daily basis!


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