Waterproof cieling?
Should I apply membrane to ceiling before I texture( mostly smooth) it with plaster?
The left and right will have glass.
There is a vent fan in the shower.
But will be mostly closed in once door is closed crating a potential steam room.
I assume corner membranes are still needed??

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If you have a fan in there, you do not need a membrane up there. A true steam shower would need to be completely waterproofed