When should underground inspections be made according to the guidelines?

The guideline states that underground inspections should be made before backfill is put in place. This is critical because conducting inspections at this stage allows for a thorough examination of the work completed, such as plumbing, electrical, or utility installations. If any issues are detected during the inspection, they can be addressed before backfilling, which is essential to ensure that the installations are safe, up to code, and functioning properly. Once the backfill is applied, accessing those installations becomes difficult or even impossible, which could lead to significant problems if any part of the installation needs repair or modification. Thus, adhering to this guideline helps maintain safety and compliance with building codes.