Repipe of an Occupied Home: Phasing

Purpose

The pipe is the simple part of a repipe. The hard part is that people are living in the house while you take their water away, and the job is judged almost entirely on whether they had a working kitchen and a working bathroom every night. A crew that runs the whole house open at once saves a day of labor and spends it back in a customer who tells everyone what the week was like. This procedure phases the work by fixture group, puts a written water-off window and an end-of-day standard on the job, and pressure tests each phase before the wall closes.

Scope

Covers a whole-house or partial repipe of the potable water distribution in an occupied residence, in phases, ending with a full-system test, disinfection and closed access.

It does NOT cover the water service from the meter to the house, which the water service line replacement SOP owns, and it does not cover drain, waste or vent replacement. Drywall repair and finishing are scoped separately and named in the contract, because "we do not paint" heard on day four is a fight nobody needs.

Roles and the handoff

The handoff that decides the job: the crew lead who calls at 3:45 pm to say the hall bath will be late, versus the one who says nothing and hopes. Both nights end the same way for the customer. Only one ends with a customer who trusts the crew.

Procedure

1. Walk the house and map fixtures, routes and the customer's real constraints before quoting a schedule. Count every fixture, note the existing material and where it is accessible, and ask what cannot be disturbed and when: a night shift sleeper, a home office with fixed calls, a baby's bath time, a medical routine. Acceptance: a fixture list, a route sketch, and the constraints written down. Wrong looks like a plan built off a floor plan alone, which meets its first surprise inside a soffit on day one.

2. Put the daily water-off window and the end-of-day standard in writing and repeat them out loud. A defensible standard is water restored by a named time each day with the kitchen and at least one full bathroom working. Acceptance: the customer has the window in writing, with the fixture promise for each night. Wrong looks like "we will have you back on tonight", which is not a standard because it cannot fail on a specific number.

3. Phase by fixture group, not by wall. Each phase is a set of fixtures that can be isolated, tested and returned to service together, typically kitchen and laundry, then a secondary bath, then the primary bath and the water heater tie-in. Acceptance: every phase has a defined isolation point and a defined end-of-day state. Wrong looks like opening every wall in the house on Monday to save trips, which leaves nothing testable, nothing closeable, and the customer living in a construction site with no end in sight.

4. Clear the concealed hazards before any wall is opened, and treat the two big ones by name. Old thermal insulation wrapped on pipe in a basement or crawl may contain asbestos: do not cut it, scrape it or sweep it, presume it until it is sampled, and route it to a licensed abatement contractor under 29 CFR 1926.1101 for construction work and the EPA NESHAP at 40 CFR 61 Subpart M. Cutting or grinding concrete or masonry releases respirable crystalline silica, which is controlled under 29 CFR 1926.1153 on construction work with water or on-tool extraction, not by a nuisance dust mask. Acceptance: both questions answered in writing before demolition.

5. Protect the occupied space before the first cut. Floor protection along every route, zip walls and negative air where the openings are extensive, furniture moved or covered, and a daily cleanup standard the crew actually meets. Acceptance: paths covered, containment up, tools off traffic routes at the end of the day. Wrong looks like drywall dust through a whole house, which costs more in goodwill than the repipe earns.

6. Open access with the assumption that anything in the cavity is live. Scan before cutting, cut shallow first, and treat any conductor found as energized until it is proved dead at the conductor with a meter checked on a known source before and after (NFPA 70E-2021, 120.5; the work practice for electrical work is 29 CFR 1910.333(b)(2)). Acceptance: cavity opened, contents identified, no conductor nicked. Wrong looks like a rotary tool through a cable, which on a good day is a repair and on a bad day is an arc across the tool in your hand.

7. Stage every fitting for the phase before the water goes off. Pipe, fittings, rings, sleeves, nail plates, hangers and the tool that makes the connection, all on site. Acceptance: the phase's bill of material physically present. Wrong looks like a supply house run at 2 pm with the house dry, which is the single most common reason an end-of-day promise gets broken.

8. Run and support the new pipe to the manufacturer's spacing, with protection where it crosses framing. Support intervals per the pipe manufacturer's published table for that material and orientation, sleeves where pipe passes through plates or masonry, protection plates where pipe is within the striking distance of a fastener at a stud or plate face, and room left for expansion on plastic. Acceptance: no sag between supports, plates fitted at every crossing. Wrong looks like an unprotected line behind a stud edge, which the drywall crew finds for you with a screw.

9. Verify every mechanical connection with the maker's own gauge, then pressure test the phase isolated. Check crimp rings with the go/no-go gauge or confirm each press with the tool's indicator, then isolate the phase and hold test pressure for the duration your code official specifies. Test with water where the material manufacturer permits it; if air is used, it is only at the pressure the manufacturer and the code official allow, with the area cleared, because a plastic system holding compressed air stores energy that fails as a projectile. Acceptance: gauged connections plus a static hold with no measurable drop. A falling gauge stops the phase: find it, remake it, and re-run the full test from the start.

10. Restore water and prove each fixture in that phase before anyone leaves. Run hot and cold at every fixture in the phase, check under every sink, flush every closet, and look at the ceiling below. Acceptance: every fixture in the phase run and dry underneath at 10 minutes. Wrong looks like a phase declared done off a pressure gauge alone, since the gauge says nothing about the trap arm somebody bumped or the stop that never got opened.

11. Close out with the old lines dead, the system flushed and the record handed over. Abandon the old piping cut and capped rather than left connected, label the new manifold or shutoffs, flush the system through and follow any disinfection the jurisdiction requires, then walk the customer through what changed. Acceptance: no live dead legs, labels on, final whole-house test on record. Wrong looks like an old branch left connected behind a wall, which becomes stagnant water tied to a potable system.

When a day does not land

A phase test fails late in the afternoon: the crew lead calls the customer before the promised time passes, says what happened and what time water returns, and the shop owns any accommodation it promised. Nobody discovers a broken promise by looking at a clock. A wall opens onto something unexpected, a structural member in the route, an unmarked electrical run, suspect insulation: stop that phase, keep the previous phase's fixtures live, and re-plan rather than improvising a route nobody inspected. The customer adds fixtures mid-job: it is a change order with its own day, not an absorbed extra, because it is what pushes the last phase into a second week. The house has no fixture that can be kept live during a phase, in a one-bath home: that is planned as an off-site night arranged before day one, not discovered at 4 pm.

The record this produces

One phase log per day plus one repipe record for the job:

• Fixture list, existing material, and the phase map with isolation points
• The written water-off window and the end-of-day fixture promise, and whether each day met it
• Asbestos and silica determinations, with sample results or the abatement contractor's paperwork
• Per phase: connections made, gauge or press verification confirmed, test medium, pressure, duration, result, and any re-test
• Photographs of open cavities showing routing, supports and protection plates, before close
• Final whole-system test, flush and any disinfection required
• Old piping abandoned and capped, with locations
• Change orders with the day they added

The drywall crew works from the cavity photographs. The next tech at that address finds the manifold from the labels. The office defends the schedule from the daily promise line, which is the only honest record of whether the crew hit it.

Worked pass: 2 bath slab home, three phases, existing galvanized

Plan: Phase 1 kitchen and laundry, Phase 2 hall bath, Phase 3 primary bath and water heater tie-in. Water-off window 8:30 am to 4:30 pm daily, with kitchen and one full bath live every night.

• Day 1, Phase 1: staged at 8:00 am, water off at 8:35 am, kitchen and laundry run, all crimps checked with the go/no-go gauge, phase held test pressure for the full period with no drop, water on at 3:50 pm, all fixtures run and dry underneath at 10 minutes.
• Day 2, Phase 2: hall bath opened, an unmarked cable found in the second cavity, proved dead at the conductor before the route was adjusted around it.
• Day 2, step 9: FAILED at 3:10 pm. The isolated hall bath phase was brought to 100 psi and fell to 92 psi in 10 minutes. Stop rule taken: the phase was not closed and the test was not accepted. Walking it with the gauge live found one crimp ring at the lavatory cold that the go/no-go gauge had not been run on, in a cramped corner where the tool had been rotated to fit. The connection was cut out, remade, and gauged, and the full test was re-run from the start rather than for the remaining time.
• The second test held with no drop, and water came back on at 5:05 pm, 35 minutes past the promised 4:30 pm. The crew lead had called the customer at 3:20 pm, ten minutes after the failed test, with the reason and a revised time of 5:15 pm. That call is the part of the day worth copying: the delay was 35 minutes, the notice was 70 minutes ahead of it, and the customer moved dinner instead of discovering a dry tap.
• Day 3, Phase 3: primary bath and water heater tie-in, whole-house test held, system flushed, old galvanized cut and capped at four locations, all recorded with photographs before close.

References

• Pipe manufacturer's installation instructions for support spacing, allowable test medium and test pressure, which govern over habit
• 29 CFR 1926.1101 and EPA NESHAP 40 CFR 61 Subpart M for asbestos-containing thermal system insulation encountered during construction work
• 29 CFR 1926.1153 for respirable crystalline silica controls when cutting or grinding concrete or masonry on construction work
• NFPA 70E-2021, 120.5 for the live-dead-live proving sequence, with the work practice at 29 CFR 1910.333(b)(2)
• The adopted plumbing code and local amendments for test pressure, duration and required disinfection
• See related: the water service line replacement SOP