What is the industry average moisture content percentage for construction lumber?

The industry average moisture content percentage for construction lumber is typically around 15%. This level of moisture content is optimal for use in construction as it balances the wood's strength, stability, and resistance to warping or splitting during the drying process. At this moisture level, lumber is less likely to develop significant shrinkage or expansion once installed, which is crucial since fluctuating moisture content can lead to structural issues over time.

A moisture content of around 20% can signify wood that is still in the drying phase, which is generally not suitable for most construction applications as it can lead to problems like mold growth and dimensional changes as the lumber continues to dry. A moisture content at 25% is high enough to increase the risk of decay and insect damage, making it inappropriate for use. While a moisture content of 10% is often ideal for interior applications, especially in dry environments, it is not the average for construction lumber, as most lumber is processed and delivered with a higher moisture content suitable for building processes.