Pressure Treated lumber (PT lumber) is a very convenient and affordable choice to offer your home buyers for exterior applications. It offers durability, rot resistance and termite protection. The chemical process which infuses these characteristics, however, can have some undesirable consequences. One such consequence is twisting over time. How Pressure Treated Lumber is Created Originally, manufacturers preserved Pressure Treated lumber with a chemical known as Chromated Copper Arsenic. The EPA eventually decided that the toxicity of this chemical was quite dangerous and recommended that such wood be treated with a penetrating oil finish bi-annually. But over time, lumber manufacturers stopped … Read more »