I have a home built in 1973 in climate zone 6.  I am going to be adding a layer of 1/2″ gypsum board to the ceiling to cover the existing popcorn ceilings which may contain asbestos.  The house currently has only some paper above the existing ceilings to act as a vapor barrier and I have been advised by contractor friends to add 6mm plastic between the layers of gypsum board.  I would be fine with putting the plastic between the gypsum board and the joists if I could do that, but putting it between the layers of gypsum board makes me nervous about moisture damage to the original ceiling during the summer months.  Is putting a vapor barrier between the two layers of the gypsum board ceiling a good idea or should I not worry about adding a barrier?  Thank you.

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