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Message: <blockquote data-quote="airshot" data-source="post: 496001" data-attributes="member: 1183"><p>There was a change in the chemicals used in PT wood around that time.  I built my home during that period when the " new and improved" PT wood was brought to market. I am wondering if the newer version is less harmfull to aluminum??  I built a deck on the back of my home that I planned on enclosing in the years to come, but as life happens, plans got changed.  The deck was  made of regular and PT lumber and treated lumber was used for landscaping projects.  This new version of treated lumber has all rotted and deteriorated while the untreated lumber is still not to bad, far better condition than all the new improved PT lumber!!!!  Neighbors have had the same experience with the new stuff.  My thoughts are that the new treated lumber may not be as corrosive as the old, it certainly does not hold up in weather conditions, even talked to home depot, and they agreed, the new stuff is no where as weather proof as the old...food for thought......</p></blockquote><p></p>