The Inspector's Walk: Finalizing the Rough-In

Transcript

SPEAKER_1: Alright, so now we're at the crucial stage where the inspector walks through to evaluate the rough-in. SPEAKER_2: Right, and that moment is the payoff for everything we've covered. The key idea is that a rough-in inspection isn't just a pressure test. It's a full-system audit while everything is still visible. SPEAKER_1: So what does the inspector actually need to see the moment they arrive on site? SPEAKER_2: Before they look at a single pipe, they check the job address is posted visibly, the permit is on site, and the approved plans are accessible. That's not a formality—if those aren't there, the inspection doesn't start. SPEAKER_1: And in NWA specifically, there's a scheduling requirement too, right? SPEAKER_2: Local water authorities commonly require at least 24 hours advance notice. And either the licensed plumber or the homeowner must be present. No one home, no inspection. That's a wasted trip and a reinspection fee. SPEAKER_1: Mm-hmm. So once they're in, is the pressure test one of the big technical gates? SPEAKER_2: That's one of the big checks. For the DWV system, the standard is either a 10-foot standing water column held for 15 minutes, or a 5 psi air test for 15 minutes with a calibrated gauge. The gauge cannot move. Any drop means a leak somewhere in the system. SPEAKER_1: And for supply piping? SPEAKER_2: Supply lines must hold working pressure—or at minimum 50 psi—for 15 minutes. Some NWA water authorities push that to 75 psi for underslab mains. The gauge has to stay flat. If it creeps down, the crew isolates sections at the manifold until they find the drop. SPEAKER_1: Wait—so a system can hold pressure perfectly and still fail? SPEAKER_2: [short pause] Absolutely. A crew can run drain lines cleanly, maintain slope, pass the air test—and then the inspector flags missing fire-stopping at a floor penetration. That's a fail. Pressure and leaks are one category. Code compliance is another. SPEAKER_1: So walk everyone through what fire-stopping actually covers in a multi-story NWA home. SPEAKER_2: Anywhere a pipe penetrates a floor assembly or a fire-rated wall, that gap must be sealed with an approved material—intumescent caulk, fire-rated foam, or a listed collar. The idea is that a pipe chase cannot become a chimney for smoke and flame between floors. Inspectors look closely at those penetrations. SPEAKER_1: And pipe support—is there a specific interval the inspector is checking against? SPEAKER_2: For horizontal drain lines, inspectors commonly verify that the piping is properly supported. Vertical PVC stacks need a support at the base and at each floor. Supply lines also need hangers at the intervals required by the applicable code and manufacturer instructions. Miss those intervals and the pipe sags, slope changes, and the whole drain argument falls apart. SPEAKER_1: So not just structural—it's protecting the slope we spent two lectures establishing underground. SPEAKER_2: Exactly. And the inspector is also checking cleanouts. Stack bases are a key cleanout location. Major direction changes are another key cleanout location. They're looking for accessible service points, not just capped stubs buried in a wall cavity. SPEAKER_1: For everyone following along—what are the most common fail points in NWA rough-ins? Like, what actually shows up on reinspection lists? SPEAKER_2: [inhale] Five things come up repeatedly. Improper drain slope—usually a long underslab run that lost grade. Missing nail plates where pipe runs close to a stud face. Unsupported pipe spans. Incomplete venting—a branch that exceeds its critical distance to the stack. And fire-stopping gaps at floor penetrations. Any one of those triggers a mandatory reinspection with an additional fee. SPEAKER_1: And when it does pass—what does the green tag actually authorize? SPEAKER_2: The pass notice means insulation and drywall can go in. That's the gate. Covering plumbing before that tag is issued can require the owner to remove the covering at their own expense. The green tag is what moves the construction sequence forward. SPEAKER_1: So what's the handoff look like from rough-in to trim-out? Because the next crew needs to know what's behind those walls. SPEAKER_2: The plumbing contractor should leave as-built notes, photos of stub-out locations, test result records with gauge readings, and documentation of any hidden conditions—like a sleeve location or a manifold port assignment. That paper trail is what the trim-out crew works from. The takeaway for anyone finishing a rough-in in NWA: the inspection is the finish line for this phase, but the documentation is what makes the next phase possible.