hello all. a question regarding wetroom floors, been to see a job on a recently installed wetroom,,plumbing was botched supposedly so floor had to be ripped up and plumbing fixed,,now the customer wants his tiles re laid,,whats the best way to angle the floor tiles to steer the water to the drain which is centred in the room? using 300 by 300 ceramics tiles and has a wedi board down already and was tanked right up to the wedi board but this seal has been ripped due to tiles being re lifted.