What preservatives are used for pressure treatment and how long are they effective?
For a long time, CCA (Chromated Copper Arsenate) has been used as a reliable wood preservative. CCA-treated wood protects against all major forms of destructive attack and is effective for many years. More recently, preservative manufacturers made a transition to a newer preservative, ACQ (Alkaline Copper Quaternary). ACQ is also effective for decades, reducing demands on forest resources. The next generation of preserved wood is ProWood Micro CA, a revolutionary product being offered throughout the United States by Universal Forest Products.
