I was being vague about "water-resistant wallboard" because code
varies. If DensArmor is OK in your area for damp areas, I'd use that. I
wouldn't use it, or greenboard either, in a wet area like a shower or
tub surround, even though lots of people do. I've repaired too many
tiled walls with rotted wallboard behind.

I have seen greenboard with mold on it so many times that I wonder
what is different about it besides the color. Thanks for the
clarification.

JK