Pressure Treated Lumber
What is pressure treated lumber?
Pressure Treated Lumber Definition– Wood that is treated with a chemical solution applied under high pressure allowing it to resist water and fungal damage.
Ideal Home Garden Explains
Pressure treated lumber is dipped in either chromated copper arsenate or alkaline copper quat. These chemicals both help prevent moisture and fight fungus, two major causes of wood rot. Alkaline copper quat is generally considered to be the safer option of the two, though extreme care should always be taken when handling either substance in home wood products.