This weekend we are going to be residing our home. Just to see how our house was built, I took a chunk of siding off.. Underneath that I found 1" Pink XPS (Assuming) hardboard insulation. I cut a chunk of that out to see what was behind it.. and I found my wall studs and insulation.. No OSB on the exterior of the house (except in the corners where they placed 4x8's. Now, I have been looking around my windows, and found that underneath them, there is just the pink 1" insulation, and no OSB, and to the sides, there is Insulation, and then OSB under it. There is no visible flashing on the outer side of the pink insulation around my windows. We haven't had any problems with our siding, or any kind of leakage with the house, we just don't like the color of the old stuff... Can we just take the old stuff off, and put the new stuff on.. or should we go a few steps further and do a house wrap over the insulation.. What do you guys recommend?