Wetroom floor

[Harry111]

Hi just looking for a bit of advice, Im turning a bathroom in to a wet room, the floor is currently concrete and it is level, wanted to ask whats the best way to create the fall?
Should i mark off the wetroom area and dig out the concrete and make the fall out of rapid set flex adhesive as the customer wants to keep costs down & does not want to buy a format tray. Any suggestions appreciated. Thanks

 

[DHTiling]

You can chop out and form the falls with new screeded area but it is damn site easier to use a former.. Customers hey!..