I can't intersect the duplicated loop cuts into the model. I first made horizontal loop cuts, then i made some vertical loop cuts and duplicated those, it would be a quick way to repeat the cuts for putting in the windows. The problem is that the vertical loop cuts do not intersect with the horizontal loop cuts. I tried intersecting them, cleaning, removing doubles, joining, boolean, etc. etc,..
Need some help here! Using Blender 2.70a