Dave writes from Arlington, Massachusetts: "I have a 1/2 finished room in my old attic (house built in the 1890s) that has knee walls (lath plaster) on the 2 sides of the A frame sloping roof. The knee wall has had faced insulation (looks like R-13) added to it with the vapor barrier on the outside (probably done because it was easy to staple onto existing studs). Can I just punch a few holes in the facing materials as opposed to taking it down? Or should I leave it alone? I see no moisture damage, but I am concerned that it has not been installed correctly?"

Answer: The paper most likely was installed to the wrong side but is still performing as a vapor barrier. By cutting the paper you will be eliminating your vapor barrier. I suggest that you leave it as it is.