Where must a two-way cleanout installed outside the building at the junction of the building drain and building sewer be extended to?

A two-way cleanout outside the building at the junction of the building drain and building sewer is required to be extended to finished grade for several key reasons.

First, extending the cleanout to finished grade ensures that it is accessible for maintenance and inspection purposes. Cleanouts are critical for clearing blockages and allowing for pipeline inspections, and having it at ground level allows homeowners and professionals easy access without the need for extensive digging or equipment.

Additionally, positioning the cleanout at finished grade helps protect it from damage from landscaping or snow accumulation. If it were installed deeper or at the basement level, it could lead to potential access issues and complicate necessary maintenance procedures.

This requirement is aligned with plumbing codes and standards, which emphasize accessibility and functionality in residential plumbing systems. Thus, extending the cleanout to finished grade promotes a practical and efficient plumbing system for both current and future needs.