My house has an exposed aggregate concrete entry way and I am planning to cover it with 16x16 inch Jerusalem limestone tiles. My problem is that the new floor will be about 1 1/2 inches above the adjacent hardwood floor. What is the best way to create a transition between the 2 surfaces? One person suggested a fairly abrupt molding solution, while another recommended a more gradual/sloping transition. I am concerned about some house guest tripping if they are not paying close attention. Are there any accepted standards for this sort of thing?