Marble threshold b/t different level floors
How is a marble threshold installed when it needs to transition between two floor surfaces at different levels, in this case, marble and hardwood? The marble will definitely sit higher than the hardwood. (Marble basketweave not installed yet, so don't know the actual height difference.) The hardwood will abut the marble on a diagonal rather than a 90 degree angle.
Also, how much should the threshold extend into the rooms on either side of the door? Should it span the entire door frame (4.25")?