I have an older home, and my bathroom has serious moisture problems when you run the shower. I am told I will need to install a fan vent over the shower, that will duct out the roof to the outside. I am fine with that, but I am planning on remodelling my bathroom within the next year or so. My problem is that my attic is full of insulation, but there is no plastic holding the insulation up. So if i begin to remove the drywall or plaster, wont all of that insulation from the attic come falling into the bathroom? Also, with no plastic to act as a vapor barrier, will the moisture from the bathroom when you run the shower, go up into the attic and cause mold in the insulation? Please help! Thanks!