For the successful fitting of a wet room shower, the bathroom area will need to be designed as a wet room from the ground up.
Basically, the entire bathroom must be waterproofed and sealed, with a drain and sloping floor successfully installed, prior to the commencement of tiling or any wet room shower system fitting.
You can find a more detailed insight into what you need for a wet room shower in our blog, Wet Rooms – How To Create The Perfect Showering Space.