Bathroom Flooding

[Pete C]

We have split our en-suite into a bathroom and wetroom area. The wetroom area is formed by 4 walls North = 1500mm East = 1400mm South = 920mm West = 850mm. The entrance into the wetroom is via an opening 600mm.
A Tuff2 former 1500mm x 820 mm has been installed, butting up against the North/East/West walls. Dura CI was laid on the remainder of the 18mm WBP ply floor area.
The floor is finished with 300mm x 300mm porcelain "lava rock" tiles and the walls covered by Grant Westfield panels which are screwed/glued/sealed and sit on top of the floor tiles.
It all looks good, but on using the shower, the fall of the tiles not on the Tuff2 allows the water to follow the perimeter of the South wall and through the opening into the bathroom area. (The shower head is sited in the middle of the North wall).
At the moment we are using bath towels as makeshift sandbags, but this is only an interim solution until the tiler is able to rectify the problem.

The thought of ripping everything out and starting again is a daunting prospect and I doubt if the tiler would be prepared to go that far.

I am therefore wondering if anyone out there has an alternative suggestion that I could put forward to the tiler for consideration.
One possible idea that has crossed my mind is putting a drain channel across the doorway, assuming this can be plumbed in to the main shower drain. Fortunately the wetroom is above the garage so access should be possible by removing part of the plasterboard ceiling.
All suggestions gratefully received.

 

[jay]

no waterstop strip between wet area and bath this would help i agree with dave remove and re fall:8:

 

[Pete C]

Thanks to Saltire 69 and again to Jay for responses.
Falls have been double-checked and confirm why water runs away from the tray former drain and out of the wetroom into the bathroom area.
Jay, as the falls are out, a waterstop between wetroom and bathroom would only result in a dam forming inside the wetroom. As I see it, we have to catch the water before it exits the wetroom into the bathroom.
The current general advice is to lift the tiles and create the correct fall. I will put this to the tiler and consider what solutions he is able to offer.

 

[tile55]

Creating a fall (slight slope) is the only way you are going to rectify this problem.
The water is always going to sit in one position and not move unless their is a gravitational pull towards the drain. In effect the bathroom floor should be slightly higher than the shower area so that water cannot pool in the bathroom area and drain away naturally.

 

[jay]

pete the waterstop i mentioned is in case of acidental flooding ie partial blocked drain (face w3asher or soap restricting flow )if falls are correct should give you a bit of time to fix blockage without having to mop up large areas it is part of our standards down here if you do not have a level to check floors a marball or steel ball bearing should always stop rolling in the drain from edges of fall area oldie but a goodie