Currently there is R19 faced insulation installed between the floor joists. I am adding R30 unfaced perpendicular to the currently installed R19. I have two questions:
1) There is an HVAC unit in the attic. Can I cover the duct work (which is already insulated with foil insulation) with the unfaced R30? My concern would be potential condensation in the summer time with the air conditioner running.
2) In some areas of the attic, there is plywood that is nailed down to the floor joists. But, there is the R19 faced underneath it. Can I just add the unfaced R30 on top of the plywood?