Pressure-treated wood has a long history−it's been around since the second half of the 19th century. Wood has been preserved with chemicals containing various pesticides as a means to protect against such intruders as termites and decay fungi. This course will provide a background on traditional CCA-treated wood, and will introduce the next-generation preservative−copper azole. We will discover how it works, why it exists, what it protects against, available types, how it is made, where it is used, and how it differs from traditional treated wood, including its key features. At the completion of this course, you will be able to describe the pressure preservative process, explain the treated wood transition that occurred in 2003, discuss the features and uses of copper azole-treated wood, and detail the many environmental benefits of treated wood.