Couple questions... 1) Skylight shaft framed with 2x4's and plywood (see from attic side). Batt insulation shoved up around it. Doesn't look like there is any vapor barrier (unless it's between plywood and drywall). What is the best way of insulating this? Can I use rigid insulation in the bays and seal it with foam? 2) House is half regular attic and half cathedral ceilings. There is a vertical wall separating the attic from the living area (with the high ceilings). Again, no vapor barrier that I could see. What is the best way of insulating this? Thanks!!