Hello! I've been doing some drywall work on a bedroom that is opposite a bathroom with a walk in shower. The shower has two shelves built in between the studs and it had a large piece of tile stuck to the back of the drywall in the opposite room.
I'm looking for recommendations for how to handle rebuilding the shelves. Is it ok to put the tile piece right up on the drywall from the opposite room? Do I need some sort of thin backing between it?
I've attached pictures from the bedroom looking into the shower and from the shower back into the bedroom.