Im almost ready to blow in my cellulose insulation on top of the existing foil backed fiberglass in the attic. I have been upgrading electric and some other things in the attic. I noticed that when I pull up the existing insulation, there are quite a few tears and finger pokes, ect. in the foil. Should I worry/fix these tears by either removing and installing a 4 mil plastic vapor barrier underneath the fiberglass? or clear tape the rips in the foil? Or will these rips and holes not really matter.