What is the typical moisture content of pressure-treated lumber after treatment?

The typical moisture content of pressure-treated lumber after treatment falls within the range of 15% to 20%. This moisture content is achieved because the pressure treatment process involves forcing the preservative chemicals into the wood, which can initially result in a higher moisture content. However, once the treatment is completed, the lumber is usually air-dried, stabilizing the moisture content at a level that makes it suitable for construction purposes.

Maintaining this moisture content is important for various reasons, including reducing the risk of warping, cracking, or other structural issues that can arise from wood that is either too dry or too wet. Additionally, a moisture content within this range ensures compatibility with other materials used in construction, such as drywall, insulation, and framing lumber, all of which can expand or contract differently depending on their moisture content.

Understanding the typical moisture content of pressure-treated lumber is essential for contractors to ensure proper installation and long-term durability of structures.