What does it mean for wood to be kiln-dried?

Kiln-dried wood refers to lumber that has been dried in a controlled environment using a kiln, which is specifically designed to circulate heat and dry the wood efficiently. This process significantly lowers the moisture content of the wood, typically to around 6-8%, which is optimal for most indoor applications. By removing moisture in a controlled manner, kiln drying helps to prevent future warping, cracking, and mold growth, resulting in wood that has improved stability and longevity.

In contrast, air-dried wood generally involves drying naturally outdoors, which can be slower and less predictable in achieving the desired moisture levels. Chemical treatments for preservation serve a different purpose, focusing on extending the wood's life against pests and decay, while cutting wood into specific shapes and sizes relates to the milling process, not drying. Therefore, kiln drying stands out as a precise method for ensuring the wood reaches the appropriate moisture content for structural integrity and performance.