AS 3740:2021 Waterproofing of Domestic Wet Areas 4.8.5: 4.8.5 Showers within 200 mm of an exit from the wet area

If a shower's edge lies 200 mm or less from a doorway out of the wet area, the shower must be enclosed and must have either a waterstop finishing at least 5 mm above finished floor under the screen, a hob, or a step-down of at least 15 mm at its edge, together with a vertical waterstop where the screen meets the wall. A note recommends the floor outside falls away from the exit.