Pressure treated wood

Pressure treated wood is a type of lumber that has been chemically treated to make it more resistant to decay, insects, and other forms of damage that can occur over time. The treatment process involves placing the wood in a large cylinder and subjecting it to high pressure, forcing a preservative solution deep into the wood fibers. The most commonly used preservative solution for pressure treated wood is chromated copper arsenate (CCA), although other preservatives such as alkaline copper quat (ACQ) and copper azole (CA) have become more popular due to concerns over the safety of CCA.