Labels:bulletin board | sky | slide projector OCR: Traditional woods Pressure Treated Lumber (PTL) Pressure-treated lumber is. as the name treated chemically under pressure, resist insect damage, rot, and from ground contact and th elements. The most common preservative until very recent times was chromated copper arsenate Yet while arsenic excellent defense against insects, rot and decay does have environmental drawbac ARemative Exterior Decking Miterials sisobbns environm ental drawbacks Mirterials
