Inspection, Testing, and Plan Review Procedures
The Inspection Process
Inspections verify compliance at stages: rough-in (before concealment), final (after completion), and special inspections (e.g., backflow, gas piping). Candidates must know what is checked at each stage, who may perform tests, and what documentation is required. Plan review precedes permitting and confirms that submitted drawings show code-compliant design.
Testing Requirements
Know the tests: water supply hydrostatic or air test, drainage water test or air test, gas piping pressure test, and backflow assembly testing. Understand that test pressures, durations, and gauges are specified, and that the AHJ may require witnessing. Test results must be recorded and retained.
Traps
- Assuming final inspection covers concealed work (it does not).
- Confusing who may test (certified testers for backflow).
- Forgetting that plan review approval does not waive code compliance.
- Overlooking that changes during construction require revised review.
- Mixing up test pressures for water vs. gas.
Worked Example / Rule of Thumb
Before calling for rough-in inspection, confirm: all piping supported and sloped, vents connected, test charged and holding pressure, and approved plans on site. Rule of thumb: if it will be concealed, it must be inspected first-no exceptions.
Plan review is a compliance check, not a design service; the designer remains responsible for code compliance.