Steve, That is not the problem. The houses of the last century are still up and serving their owners well. They didnt treat wood in those days. The problem is they dont have a clue about design, or any of the more scientific reasons that create this problem. Pressure treated timber, is far superior to painted treated timber, but that has nothing to do with the problem. The problem lies in the fact that design is completely wrong. Build a house with untreated wood exactly as your great grandfather did, and it will last 150 years. Let the timber breathe no stupid insulation in the wall.
macdunk