The next step towards installing tile in this shower stall after the hot mopped tar is to finish off the framing with some drywall sheets that will be the base of the walls. But a special kind of drywall is used instead, it's called greenboard. It's not named green as in some phony environmentalist money grab way that's so popular these days, instead, it's a water resistant variation of regular old gypsum drywall - the kind that lines the walls modern homes.
Next well see the greenboard installed and see how the bathroom remodeling project progresses from there. Things are really starting to take shape, but there's a long way to go before this bathroom remodeling project is complete.