Are you sure it's the same thing? Blue board is for plaster, green board(whice they doing away with) is for compound. I really don't know if this would make a difference or not. Just asking.
And to poster I don't think either is considered a moisture barrier.
Agreed. Blue board is a base for veneer plaster and doesn't even have depressed edges like drywall. The facer is not meant to provide a finished surface. Greenboard is moisture resistant drywall, but is meant to provide a finished surface ready to paint. Newer purple colored board (MR board) is moisture and mold resistant. None of these are moisture "barriers". None will survive any extended exposure to water.
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