If the rough floor is uneven, where should the sill be set?

Setting the sill at the highest point on an uneven floor is essential for proper function and safety of the elevator door system. When the sill is aligned with the highest point, it minimizes the risk of water or debris accumulation within the elevator shaft and provides a more accessible entrance for passengers. This placement ensures that any water or obstruction that may enter will flow away rather than pooling at the entrance.

By positioning the sill at the highest point, you also help to maintain a level transition between the car and the landing, which is critical for the comfort and safety of passengers entering and exiting the elevator. It guards against tripping hazards and ensures that the elevator operates smoothly, especially in cases of slight variations in floor height.

Other potential placements like setting the sill at the lowest or middle points could introduce various problems. A lower sill might lead to water ingress and create unwanted hazards, while a middle placement wouldn't effectively address the unevenness, leaving one side higher and creating an unsafe condition. Hence, setting the sill at the high point is the best practice for overcoming the challenges posed by uneven rough floors.