My situation is this. I have a 1930's home and the Kitchen floor is the old Quarry Tiles laid on sand. No damp membrane. In the past I have applied a few coats of PVA and successfully prevented any damp on the surface of the floor. I now want to level the floor with laying a laminate floor in mind. But, over the years the center of the floor has sunk up to approx 30mm. Has any one any success in using floor self leveling screeds and if so any tips please? Thanks Mark