Step 7 · Rough-In Inspection
The final step before you can insulate and hang drywall is the rough-in inspection. The plumbing inspector will return to check all of your work. They will verify that the DWV and supply lines are installed correctly, properly supported, and meet all code requirements. They will likely require a pressure test on both the DWV and the supply lines. For the DWV system, this involves sealing the system with a test ball or inflatable plug and filling it with water up to a certain level (or pressurizing it with air) to check for leaks. The supply lines will be tested under normal house pressure. Do not proceed with wall coverings until you have passed this final plumbing inspection.
Tools and Materials
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