I just bought a new house (built in 2005) and the windows (Vinylite, sliders) become fogged and iced up on a cold winter day. This is not just normal fog and ice, the fog encompasses the entire window and the ice is thick around the edges. I even had it on the vinyl, well below the window. I have noticed that people around this area put there windows in and then apply house wrap up to the window, not behind it. They do not flash out the sill and do not flash out the nailing flange. The windows also let in a lot of cold air. What's the problem, any ideas?