Currently gutting a room in our old farmhouse... the walls are currently drywall covered by plaster. We’ve run into the issue that the existing insulation in the attic is loose and has no plastic down as it was put in before we owned the house. How do we do the ceiling? If we drywall over existing ceiling, how do we handle the wire mesh that is in all seams? Are we better off to hire a professional to handle the insulation? Please give all advise as we are new to the home remodel and this is our first project on our own.