I have a room approx 3.5m x 3.5m. There is an opening to the kitchen at one end, and a door to the hall at the other. But these are at different levels, the hall end being 10-15mm lower than the kitchen end. A dpc and concrete base is already laid, and I now need to lay the screed. I understand that if the room was level the technique would be to screed it in strips, i.e., using short lengths of screed batons levelled across one end, then the screed levelled between the batons, the batons then removed and the slots filled in, and then move down the room to lay the batons for the next strip. But how do you tackle it with a gradient? Any advise will be welcomed.