At what minimum height above finished floor should a cleanout be installed above a water closet?

A cleanout installed above a water closet must meet certain height requirements to ensure proper accessibility and functionality. The minimum height of 42 inches above finished floor is specified in plumbing codes to facilitate maintenance and inspection without obstructing routine use of space. This height helps ensure that the cleanout is accessible for clearing blockages while also minimizing the risk of damage or interference with the water closet itself.

Setting the cleanout at 42 inches provides a standard that plumbing professionals can depend on, ensuring consistency across installations. This also aligns with ergonomic practices, allowing technicians to perform necessary tasks with ease. Maintaining code compliance with the specified height ensures that plumbing systems function efficiently and facilitates prompt response during maintenance activities.

Other height options, such as 30 inches, 40 inches, or 48 inches, do not align with the established standards, which is why they are not preferred.