Please dont use this in your shower, the finish on this stone will be a magnet for soap scum and bacteria and you will be forever scrubbing these walls. Its a great stone by the look of it but for practical reasons it's just not suitable for a shower and the conditions that are generated in a shower area.
And yes imo tanking the showerbase and walls would be a good idea as tiles and grout should never be considered as part of a waterproof system.
And yes imo tanking the showerbase and walls would be a good idea as tiles and grout should never be considered as part of a waterproof system.
