Cleanouts for underground drains installed inside a building must be extended to what level?

Cleanouts for underground drains installed inside a building must be extended to floor level to ensure ease of access for maintenance and inspection purposes. This requirement facilitates the removal of blockages and allows for the proper maintenance of the drainage system without the need for extensive excavation.

By positioning the cleanouts at floor level, plumbers can access them comfortably with basic tools, ensuring that routine checks and any necessary repairs can be completed efficiently. This standards-based approach also helps to prevent future plumbing issues by allowing for timely interventions before problems can escalate.

In contrast, extending cleanouts to ground level, ceiling level, or foundation level could pose significant accessibility challenges, making it difficult to service the drains when necessary. Therefore, the requirement to have cleanouts at floor level strikes a balance between practicality and functionality in plumbing design.