ProWood Lifetime-Limited Warranty

Many DIYers and professionals trust the ProWood brand with high-quality products and a lifetime-limited warranty for ground contact and above-ground treated lumber. We stand by our premium products yet understand that wood can vary by region. To best serve you, if you are the original owner and your project follows the correct application and encounters any structural failure due to rot, fungal decay, or termite attack during its life, we will replace or refund the original price.


ProWood Lifetime-Limited Warranty 

Knowing the Correct Application Usage

Our lifetime-limited warranty covers ground contact and above-ground pressure-treated lumber. Selecting the correct type of lumber is crucial for the longevity of your project and wallet. We know it can be confusing without professional guidance, and to help, we created and attached black end tags to our lumber boards that are easy to read and recognize. (Check out our guide to reading a lumber tag.)

Ground Contact

Wood treated to (UC4A) ground contact standards is ideal for general-use situations where the wood may have contact moisture, the ground or installed in a manner that subjects the wood to comparable ground contact conditions – such as poor ventilation, tropical climates, or frequent exposure to moisture.


  • Deck joists
  • Beams
  • Ledger boards
  • Posts
  • Stair stringers
  • Certain deck board installations

Ground contact lumber is most commonly used in outdoor projects. It’s ideal for critical structures and projects that will spend its life on or in the ground.

Above Ground

Wood treated to (UC3B) above-ground standards is ideal for light-duty situations where the wood is not in contact with moisture or the ground.


  • 2x4 or 2x6 railings
  • Certain deck board installations

Above-ground and ground contact lumber applications must adhere to UC4A requirements when the wood is:

  • Difficult to maintain, repair or replace (such as deck joists and ledger boards) and are critical to the performance and safety of the entire system/construction.
  • Installed less than 6 inches from the ground.
  • At risk for poor air circulation (little airflow)
  • Likely to have prolonged contact with vegetation or damp leaves.
  • Exposed to frequent moisture.
  • Used in a tropical climate.

We focus on education first with the black end tag. For more information on our Lifetime-Limited Warranty, visit

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